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ChT Review Q&A > Sanfoundry > Flashcards

Sanfoundry Flashcards

1
Q

Which of the following is not a common method used for purification?

a) Sublimation
b) Crystallisation
c) Electrolysis
d) Chromatography

A

c) Electrolysis

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2
Q

Crystallisation is based on the ____________

a) Difference in melting point
b) Difference in boiling point
c) Difference in pressure
d) Difference in solubility

A

d) Difference in solubility

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3
Q

Which of the following is the example of crystallisation process?

a) Purification of alum
b) Purification of sea water
c) Separation of gases from air
d) None of the mentioned

A

a) Purification of alum

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4
Q

At room temperature, the impure compound in crystallisation is ____________

a) Soluble
b) Sparingly soluble
c) Insoluble
d) None of the mentioned

A

b) Sparingly soluble

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5
Q

Which of the following is known as mother liquor?

a) Solvent
b) Solute
c) Solution
d) Filtrate

A

d) Filtrate

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6
Q

The solution of impure compound and solvent is concentrated to get ____________

a) Unsaturated solution
b) Undersaturaed solution
c) Saturated solution
d) Oversaturated solution

A

c) Saturated solution

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7
Q

Insoluble impurities from solution during crystallization are removed by ____________

a) Drying
b) Filtration
c) Heating
d) Cooling

A

b) Filtration

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8
Q

The solution which is obtained after filtration is ____________

a) Suspended solution
b) Clear solution
c) Colloidal solution
d) None of the mentioned

A

b) Clear solution

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9
Q

Crystal phases can be inter-converted by varying ____________

a) Temperature
b) Pressure
c) Size
d) Viscosity

A

a) Temperature

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10
Q

The nature of the crystallization process is governed by _____________

a) Thermodynamics
b) Kinetic factors
c) Thermodynamics and Kinetic factors
d) None of the mentioned

A

c) Thermodynamics and Kinetic factors

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11
Q

The process of heating a liquid mixture to form vapours and then cooling the vapours to get pure component is called ____________

a) Crystallisation
b) Distillation
c) Chromatography
d) Sublimation

A

b) Distillation

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12
Q

Porcelain pieces are put into the distillation flask to avoid ____________

a) Overheating
b) Uniform boiling
c) Bumping of the solution
d) None of the mentioned options

A

c) Bumping of the solution

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13
Q

The boiling point of chloroform is ____________

a) 334 K
b) 286 K
c) 350 K
d) 298 K

A

a) 334 K

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14
Q

The boiling point of aniline is ____________

a) 438 K
b) 370 K
c) 338 K
d) 457 K

A

d) 457 K

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15
Q

How aniline and chloroform can be separated?

a) Sublimation
b) Condensation
c) Distillation
d) Evaporation

A

c) Distillation

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16
Q

Which of the following is not separated through distillation process?

a) Acetone and water
b) Aniline and chloroform
c) Impurities in Sea water
d) Milk and water

A

d) Milk and water

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17
Q

Which of the following will vaporize faster?

a) Aniline
b) Chloroform
c) Water
d) Kerosene

A

b) Chloroform

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18
Q

The distilled water is collected in ____________

a) Receiver
b) Adapter
c) Condenser
d) Round bottom flask

A

a) Receiver

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19
Q

The process of distillation is used for the liquids having ____________

a) Sufficient difference in their boiling point
b) Sufficient difference in their melting point
c) Sufficient difference in their solubility
d) None of the mentioned

A

a) Sufficient difference in their boiling point

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20
Q

The residue in the round bottom flask is ____________

a) Volatile
b) Non volatile
c) None of the mentioned
d) Volatile & Non volatile

A

b) Non volatile

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21
Q

Fractional distillation is a process of separation of ____________

a) 2 miscible liquids
b) 2 immiscible liquids
c) 1 miscible and 1 immiscible liquid
d) None of the mentioned

A

a) 2 miscible liquids

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22
Q

The difference in boiling point of 2 liquid in fractional distillation is ____________

a) Greater than 25 K
b) Less than 25 K
c) Equal to 25 K
d) None of the mentioned

A

b) Less than 25 K

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23
Q

A simple fractional tube is packed with ____________

a) Wooden beads
b) Plastic beads
c) Metal beads
d) Glass beads

A

d) Glass beads

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24
Q

Fractional distillation is different from distillation because of the presence of ____________

a) Fractionating column
b) Condenser
c) Distillation flask
d) Conical flask

A

a) Fractionating column

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25
Q

The beads are provided in fractional column for ____________

a) Vapours to generate
b) Vapours to condense
c) Vapours to evaporate
d) All of the mentioned

A

b) Vapours to condense

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26
Q

Select the incorrect statement from the following options.

a) Fractionating columns are available in various design and size
b) Fractionating columns are available according to one fixed standard
c) A simple fractionating column is a tube packed with glass beads
d) Fractional distillation is the process of separation of different gases from air

A

b) Fractionating columns are available according to one fixed standard

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27
Q

Which of the following gases cannot be separated from air using fractional distillation?

a) Argon
b) Oxygen
c) Helium
d) Nitrogen

A

c) Helium

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28
Q

Initially, the temperature at the top of the column is _______________ than at its bottom.

a) Greater
b) Lesser
c) Equal
d) None of the mentioned

A

b) Lesser

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29
Q

Which of the following is more suitable for fractional distillation process?

a) Oil bath
b) Water bath
c) Glycerine bath
d) None of the mentioned

A

a) Oil bath

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30
Q

Number of steps required for the separation of two liquids in fractional distillation is _________

a) 1
b) 2
c) 3
d) 4

A

b) 2

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31
Q

In steam distillation, the liquid boils when the sum of vapour pressure due to organic liquid and due to water becomes ____________

a) Greater than atmospheric pressure
b) Lesser than atmospheric pressure
c) Equals to atmospheric pressure
d) None of the mentioned

A

c) Equals to atmospheric pressure

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32
Q

The organic liquid in steam distillation vaporizes at ____________

a) Lower temperature than its boiling point
b) Higher temperature than its boiling point
c) At its boiling point
d) None of the mentioned

A

a) Lower temperature than its boiling point

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33
Q

Steam distillation process is used to separate substances which are ____________

a) Steam volatile
b) Steam volatile and immiscible with water
c) Steam volatile and miscible with water
d) All of the mentioned

A

b) Steam volatile and immiscible with water

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34
Q

What type of mixture is collected in round bottom flask after passing through a steam generator?

a) Mixture of volatile organic compound and water
b) Mixture of nonvolatile organic compound and water
c) Mixture of nonvolatile inorganic compound and steam
d) Mixture of volatile organic compound and steam

A

d) Mixture of volatile organic compound and steam

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35
Q

Which of the following property is not possessed by the organic solvent required to separate organic compound with water?

a) It is immiscible with water
b) It is less volatile than water
c) It is easily vaporisable
d) Organic compound is more soluble in it

A

b) It is less volatile than water

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36
Q

Which of the following is the upper layer in differential extraction?

a) Solvent layer
b) Solute layer
c) Aqueous layer
d) None of the mentioned

A

a) Solvent layer

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37
Q

When does the organic compound be present in the upper solvent layer in differential extraction?

a) Before the extraction
b) During the extraction
c) After the extraction
d) It is always present in the upper layer

A

c) After the extraction

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38
Q

The organic compound in differential extraction is recovered from the organic solvent by ____________

a) Distillation
b) Fractional crystallisation
c) Steam crystallisation
d) Sublimation

A

a) Distillation

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38
Q

The pure solvent after the differential extraction cannot be used again for the extraction.

a) True
b) False

A

b) False

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39
Q

Aniline is separated from aniline-water mixture using ____________

a) Fractional distillation
b) Fractional crystallisation
c) Steam distillation
d) All of the mentioned

A

c) Steam distillation

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40
Q

Chromatography is the process for identification, purification and separation of components of a mixture on the basis of ____________

a) Difference in their boiling point
b) Difference in their melting point
c) Difference in their affinity for mobile and stationary phase
d) Difference in their solubility

A

c) Difference in their affinity for mobile and stationary phase

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41
Q

Chromatography involves two mutually ____________

a) Immiscible phases
b) Miscible phases
c) Soluble phases
d) None of the mentioned

A

a) Immiscible phases

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42
Q

There is no need of support if packed into a column when the stationary phase is ____________

a) Gas
b) Liquid
c) Solid
d) None of the mentioned

A

c) Solid

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43
Q

Which of the following is not a stationary phase?

a) Liquid-liquid chromatography
b) Gas-liquid chromatography
c) Gas-solid chromatography
d) Solid-solid chromatography

A

d) Solid-solid chromatography

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44
Q

Liquid chromatography is a technique for separating ____________

a) Ions that are not dissolved in a solvent
b) Ions that are dissolved in a solvent
c) Ions that are dissolved in a solute
d) All of the mentioned

A

b) Ions that are dissolved in a solvent

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45
Q

In exclusion chromatography, solute molecules are separated based on ____________

a) Molecular geometry and size
b) Molecular composition
c) Molecular phase
d) Molecular formula

A

a) Molecular geometry and size

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46
Q

The gas-solid chromatography is ______________ chromatography as per basic principle involved.

a) Exclusion
b) Ion-exchange
c) Adsorption
d) Absorption

A

c) Adsorption

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47
Q

A proper solvent that is passed through the column for elution so that separated components can be collected is called ____________

a) Adsorbent
b) Buffer solution
c) Mobile phase
d) None of the mentioned

A

b) Buffer solution

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48
Q

The relative solubility of solute in both the phases determines the ____________

a) Rate of movement of solvent
b) Rate of disappearance of solvent
c) Rate of movement of solute
d) Rate of disappearance of solute

A

c) Rate of movement of solute

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49
Q

If the mobile phase is gas, movement of solute is determined by its ____________

a) Boiling point
b) Melting point
c) Solubility
d) Volatility

A

d) Volatility

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50
Q

Column Chromatography
Column chromatography is based on the principle of _______________

a) Ion-exchange
b) Exclusion principle
c) Differential adsorption
d) Absorption

A

c) Differential adsorption

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51
Q

Arrange the following compounds in order of their increasing adsorption tendencies.

a) Cellulose&raquo_space; starch&raquo_space; calcium carbonate&raquo_space; alumina
b) Cellulose&raquo_space; starch&raquo_space; alumina&raquo_space; charcoal
c) Charcoal&raquo_space; cellulose&raquo_space; alumina&raquo_space; starch
d) Calcium carbonate&raquo_space; alumina&raquo_space; starch&raquo_space; cellulose

A

a) Cellulose&raquo_space; starch&raquo_space; calcium carbonate&raquo_space; alumina

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52
Q

What is the factor responsible for the separation in column chromatography?

a) Polarity differences between the solvent
b) Polarity differences between the solute
c) Polarity indifference between the solvent
d) Polarity indifference between the solute

A

b) Polarity differences between the solute

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53
Q

Select the correct statement from the following options.

a) The lesser the polarity of solute, more strongly it will be adsorbed on a polar surface
b) The greater the polarity of solute, more weakly it will be adsorbed on a polar surface
c) The greater the polarity of solute, more strongly it will be adsorbed on a polar surface
d) All of the mentioned option

A

c) The greater the polarity of solute, more strongly it will be adsorbed on a polar surface

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54
Q

The correct order of increasing strength of adsorption is ____________

a) Alkanes&raquo_space; Esters&raquo_space; Aldehydes&raquo_space; Phenols&raquo_space; Ketones
b) Aldehydes&raquo_space; Phenols&raquo_space; Ketones&raquo_space; Esters&raquo_space; Alkanes
c) Aldehydes&raquo_space; Ketones&raquo_space; Esters&raquo_space; Alkanes&raquo_space; Phenols
d) Alkanes&raquo_space; Esters&raquo_space; Ketones&raquo_space; Aldehydes&raquo_space; Phenols

A

b) Aldehydes&raquo_space; Phenols&raquo_space; Ketones&raquo_space; Esters&raquo_space; Alkanes

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55
Q

The components of the mixture in column chromatography are eluted in order of ____________

a) Increasing polarity and decreasing distribution ratio
b) Increasing polarity and increasing distribution ratio
c) Decreasing polarity and increasing distribution ratio
d) Decreasing polarity and decreasing distribution ratio

A

b) Increasing polarity and increasing distribution ratio

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56
Q

The elution power of a solvent is determined by ____________

a) Its overall polarity
b) The polarity of the stationary phase
c) The nature of the sample components
d) All of the mentioned

A

d) All of the mentioned

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57
Q

Which of the following is separated through column chromatography?

a) Chlorophyll and carotenoids
b) Inorganic cations or complexes
c) Sugar derivatives
d) Amino acids formed by hydrolysis of a protein molecule

A

a) Chlorophyll and carotenoids

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58
Q

The mixture of petroleum ether and benzene is used in the elution ratio of ____________

a) 1 : 2
b) 1 : 5
c) 1 : 9
d) 1 : 12

A

c) 1 : 9

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59
Q

Chloroform fraction is eluted from the column by passing chloroform through the column which acts as ____________

a) Eluter
b) Eluant
c) Elution
d) None of the mentioned option

A

c) Elution

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60
Q

The principle on which thin layer chromatography is based is that the ____________

a) Different compounds are absorbed on an absorbent to different degrees
b) Different compounds are absorbed on an absorbent to same degrees
c) Different compounds are adsorbed on an adsorbent to different degrees
d) Different compounds are absorbed on an absorbent to same degrees

A

c) Different compounds are adsorbed on an adsorbent to different degrees

61
Q

The size of a thin layer of adsorbent is about ____________

a) 0.1 mm
b) 0.2 mm
c) 0.3 mm
d) 0.4 mm

62
Q

The chromaplate or thin layer chromatography plate is made up of ____________

a) Glass
b) Wood
c) Fibre
d) Metal

63
Q

The eluant filled in the closed jar is ____________

a) Mixture of gases
b) Mixture of a liquid and a gas
c) Mixture of solids
d) Mixture of liquids

A

d) Mixture of liquids

64
Q

Select the incorrect statement from the following options.

a) The spots of colorless compounds are invisible to the eyes
b) These spots can be detected by putting the plate under ultraviolet light
c) These spots can be detected by placing the plate in a covered jar containing iodine crystals
d) None of the mentioned

A

d) None of the mentioned

65
Q

The relative adsorption of each component of the mixture is expressed in terms of its ____________

a) Acceleration factor
b) Retardation factor
c) Both acceleration and retardation factor
d) None of the mentioned

A

b) Retardation factor

66
Q

Select the correct statement from the following.

a) Paper chromatography is a type of partition chromatography
b) A special quality paper is used in paper chromatography
c) Chromatography paper contains water trapped in it, which acts as stationary phase
d) All of the mentioned

A

d) All of the mentioned

67
Q

Amino acids detected by spraying the plate with ninhydrin solution is an example of ____________

a) Column chromatography
b) Thin layer chromatography
c) Paper chromatography
d) Liquid chromatography

A

c) Paper chromatography

68
Q

Paper chromatography is based on continuous differential partitioning of components of a mixture between stationary and mobile phases.

a) True
b) False

69
Q

Retardation factor is the ratio of ____________

a) Distance moved by substance from base line to distance moved by the solvent from base line
b) Distance moved by solvent from base line to distance moved by the substance from base line
c) Distance moved by substance from top line to distance moved by the solvent from top line
d) Distance moved by solvent from top line to distance moved by the substance from top line

A

a) Distance moved by substance from base line to distance moved by the solvent from base line

70
Q

What are the uses of partition chromatography?

a) Separation of amino acids
b) Analysis of closely related aliphatic alcohols
c) Separation of sugar derivatives
d) All of the mentioned

A

d) All of the mentioned

71
Q

Which type of chromatography is used for the structural analysis?

a) Column chromatography
b) Paper chromatography
c) Partition chromatography
d) Affinity chromatography

A

b) Paper chromatography

72
Q

Which of the following is not done using column chromatography?

a) The identification of unknown compounds
b) The determination of homogeneity of chemical substances
c) Separation of inorganic cations or complexes
d) Separation of geometric isomers

A

c) Separation of inorganic cations or complexes

73
Q

Affinity chromatography is used for the analysis and isolation of ____________

a) Insoluble starch substances
b) Enzyme tyrosinase
c) Antibodies bound with a covalently-attached antigen on cellulose column
d) All of the mentioned

A

d) All of the mentioned

74
Q

Purification of enzymes and proteins is done using ____________

a) Affinity chromatography
b) Liquid chromatography
c) Column chromatography
d) Thin layer chromatography

A

a) Affinity chromatography

75
Q

Which of the following is not an application of high performance liquid chromatography?

a) Analysis of proteins, drugs and explosives
b) Separation of pharmaceutical drugs
c) Elimination of undesirable substances from blood
d) Separation of lipids, fatty acids and steroids

A

c) Elimination of undesirable substances from blood

76
Q

The checking of purity of samples is the application of thin layer chromatography.

a) True
b) False

77
Q

The analysis and separation of industrial products like soap and synthetic detergents is done using ____________

a) Thin layer chromatography
b) Gas chromatography
c) Ion exchange chromatography
d) Partition chromatography

A

b) Gas chromatography

78
Q

Which of the following is the application of ion exchange chromatography?

a) The softening of hard water
b) The demineralisation of water
c) The separation and determination of anions
d) All of the mentioned

A

d) All of the mentioned

79
Q

The quantitative analysis is done using ____________

a) Ion exchange chromatography
b) Thin layer chromatography
c) Gas chromatography
d) Liquid chromatography

A

c) Gas chromatography

80
Q

The purity of the compound is confirmed by ____________

a) Its melting point and boiling point
b) Chromatographic technique
c) Spectroscopy
d) All of the mentioned

A

d) All of the mentioned

81
Q

Select the correct statement from the following options.

a) The transformation of solid to liquid is called melting and the reverse process is called freezing
b) The transformation of solid to liquid is called freezing and the reverse process is called melting
c) The transformation of liquid to solid is called melting and the reverse process is called freezing
d) None of the mentioned

A

a) The transformation of solid to liquid is called melting and the reverse process is called freezing

82
Q

The temperature at which solid and liquid coexist in equilibrium is called ____________

a) Melting point of liquid
b) Freezing point of liquid
c) Freezing point of solid
d) All of the mentioned

A

b) Freezing point of liquid

83
Q

Select the incorrect statement from the following option.

a) Every pure solid crystalline substance has a characteristic and unique melting point
b) Impure sample of substance has different melting point
c) Two different pure substances have same melting points
d) Melting point serves as the criteria of purity of a solid substance

A

c) Two different pure substances have same melting points

84
Q

When the solid and liquid phase are in equilibrium, the temperature ____________

a) Increases gradually
b) Decreases gradually
c) Remains constant
d) None of the mentioned

A

c) Remains constant

85
Q

The melting point of ice is ____________

a) 0°C
b) 100°C
c) 4°C
d) -4°C

86
Q

Molar heat of fusion is defined as ____________
a) Energy required to melt one gram of solid
b) Energy required to melt one mole of solid
c) Energy required to melt one kilogram of solid
d) Energy required to melt ten moles of solid

A

b) Energy required to melt one mole of solid

87
Q

The temperature remains constant during phase change because the increased kinetic energy is used to overcome the cohesive forces in the liquid.

a) True
b) False

88
Q

What is the molar heat of fusion (kJ/mol) of water?

a) 1.3
b) 0.84
c) 7.61
d) 6.01

89
Q

What is the melting point of mercury?

a) 357°C
b) -39°C
c) 0°C
d) 100°C

90
Q

On increasing the temperature of a liquid, its vapour pressure ____________

a) Decreases
b) Remain constant
c) Increases
d) None of the mentioned

A

c) Increases

91
Q

The boiling point of a liquid is the temperature at which the vapour pressure ____________

a) Is equal to the internal pressure
b) Is equal to the external pressure
c) Is greater than an internal pressure
d) Is lesser than an internal pressure

A

b) Is equal to the external pressure

92
Q

The normal boiling point of a liquid is the temperature at which it boils when the external pressure is ____________

a) 1 atm
b) 2 atm
c) 3 atm
d) 5 atm

93
Q

If the non-volatile impurities contaminate the liquid, its boiling point gets ____________

a) Depressed
b) Elevated
c) Remains same
d) None of the mentioned

A

b) Elevated

94
Q

The energy required to vaporize 1 mole of a liquid is known as ____________

a) Molar heat of fusion
b) Molar heat of freezing
c) Molar heat of boiling
d) Molar heat of vaporization

A

d) Molar heat of vaporization

95
Q

At 1 atm pressure, the boiling point of water is ____________

a) 0°C
b) 100°C
c) -100°C
d) None of the mentioned

96
Q

The boiling point and molar heat of vaporisation is dependent on ____________

a) Strength of the inter-molecular forces
b) Composition of the liquid compound
c) Size of the molecules
d) All of the mentioned

A

a) Strength of the inter-molecular forces

97
Q

Select the incorrect statement from the following options.

a) Methane and argon have weak dispersion forces so their boiling point is low
b) Diethyl ether has a dipole moment, and the dipole-dipole forces accounts for its moderately high boiling point
c) Water and ethanol have strong hydrogen bonding and hence they possess high boiling point
d) Mercury has weak metallic bonding which is responsible for its low boiling point

A

d) Mercury has weak metallic bonding which is responsible for its low boiling point

98
Q

For a given substance, choose the correct statement.

a) ΔHfus is greater than ΔHvap
b) ΔHfus is equal to ΔHvap
c) ΔHfus is smaller than ΔHvap
d) None of the mentioned

A

c) ΔHfusis smaller than ΔHvap

99
Q

The molar heat of vaporisation (ΔHvap) for water is ____________

a) 40.79 kJ/mol
b) 31.0 kJ/mol
c) 59.0 kJ/mol
d) 9.2 kJ/mol

A

a) 40.79 kJ/mol

100
Q

The analysis of electromagnetic radiation scattered, absorbed or emitted by the molecule is called __________

a) Kaleidoscopy
b) Astronomy
c) Spectroscopy
d) Anatomy

A

c) Spectroscopy

101
Q

The energy level with lower energy is called __________

a) Ground state energy level
b) Initial state energy level
c) Excited state energy level
d) All of the mentioned

A

a) Ground state energy level

102
Q

Absorption spectrum results when an electron in an atom undergoes a transition from __________

a) Higher energy level to a lower one
b) Lower energy level to a higher one
c) Intermediate levels
d) All of the mentioned

A

b) Lower energy level to a higher one

103
Q

The energy of a photon is given by __________

a) h/ν
b) ν/h
c) 1/hν
d) hν

104
Q

Select the incorrect statement from the following option.

a) Emission spectrum results when an electron in an atom undergoes a transition from excited state to the ground state
b) In the emission spectrum, transition takes place with the emission of a photon of energy hν
c) In the emission spectrum, transition takes place with the absorption of a photon of energy hν
d) All of the mentioned

A

c) In the emission spectrum, transition takes place with the absorption of a photon of energy hν

105
Q

The spectra can be broadly classified into two categories. They are __________

a) Atomic and molecular spectra
b) Atomic and electronic spectra
c) Molecular and electronic spectra
d) None of the mentioned

A

a) Atomic and molecular spectra

106
Q

In atomic spectroscopy, only electronic transitions are involved.

a) True
b) False

107
Q

Select the correct statement from the following options.

a) Molecular spectra arises from the transition of an electron between the molecular energy levels
b) In molecular transitions, electronic, rotational and vibration transitions occurs
c) Molecular spectra is more complicated than atomic spectra
d) All of the mentioned

A

d) All of the mentioned

108
Q

The necessary condition for absorption spectrum is that __________

a) hν should be greater than the energy difference
b) hν should be smaller than the energy difference
c) hν should be equal to the energy difference
d) none of the mentioned

A

c) hν should be equal to the energy difference

109
Q

Spectroscopy deals with the transition that a molecule undergoes on the absorption of suitable radiations determined by quantum mechanical selection rules.

a) True
b) False

110
Q

The different types of energies associated with a molecule are __________

a) Electronic energy
b) Vibrational energy
c) Rotational energy
d) All of the mentioned

A

d) All of the mentioned

111
Q

During the motion, if the centre of gravity of molecule changes, the molecule possess __________

a) Electronic energy
b) Rotational energy
c) Translational energy
d) Vibrational energy

A

c) Translational energy

112
Q

The correct order of different types of energies is __________

a) Eel» Evib» Erot» Etr
b) Eel» Erot» Evib» Etr
c) Eel» Evib» Etr» Erot
d) Etr» Evib» Erot» Eel

A

a) Eel» Evib» Erot» Etr

113
Q

The region of electromagnetic spectrum for nuclear magnetic resonance is __________

a) Microwave
b) Radio frequency
c) Infrared
d) UV-rays

A

b) Radio frequency

114
Q

Which of the following is an application of molecular spectroscopy?

a) Structural investigation
b) Basis of understanding of colors
c) Study of energetically excited reaction products
d) All of the mentioned

A

d) All of the mentioned

115
Q

Select the correct statement from the following option.

a) Spectroscopic methods require less time and more amount of sample than classical methods
b) Spectroscopic methods require more time and more amount of sample than classical methods
c) Spectroscopic methods require less time and less amount of sample than classical methods
d) Spectroscopic methods require more time and less amount of sample than classical methods

A

c) Spectroscopic methods require less time and less amount of sample than classical methods

116
Q

The results obtained by spectroscopic methods are less reliable, less reproducible and incorrect than classical methods.

a) True
b) False

117
Q

The transition zone for Raman spectra is __________

a) Between vibrational and rotational levels
b) Between electronic levels
c) Between magnetic levels of nuclei
d) Between magnetic levels of unpaired electrons

A

a) Between vibrational and rotational levels

118
Q

The criteria for electronic spin resonance is ____________

a) Periodic change in polarisability
b) Spin quantum number of nuclei > 0
c) Presence of unpaired electron in a molecule
d) Presence of chromophore in a molecule

A

c) Presence of unpaired electron in a molecule

119
Q

Sample recovery is possible after spectroscopic analysis because the sample is not chemically affected.

a) True
b) False

120
Q

The electronic spectra in the visible range span is __________

a) 25000-72000 cm-1
b) 25000-50000 cm-1
c) 12500-25000 cm-1
d) 15000-30000 cm-1

A

c) 12500-25000 cm-1

121
Q

Which of the following transitions are of weak intensities and lie in the visible region?

a) n→n*
b) σ→σ*
c) π→π*
d) n→σ*

122
Q

Arrange the various electronic transitions in the order of increasing energy.

a) n→σ< π→π< n→π< σ→σ
b) n→π< π→π< n→σ< σ→σ
c) n→σ< n→π< π→π< σ→σ
d) σ→σ< π→π< n→π< n→σ

A

b) n→π< π→π< n→σ< σ→σ

123
Q

What is the position of the band of alkanes?

a) 190 nm
b) 185 nm
c) 217 nm
d) 150 nm

124
Q

Which of the following organic compound shows transition due to conjugation?

a) Alkenes
b) Saturated aliphatic ketones
c) Conjugated dienes
d) Alkanes

A

c) Conjugated dienes

125
Q

Which of the following is not an auxochrome group?

a) –OH
b) –SH
c) –OR
d) –O2

126
Q

Which of the following shift leads to the decreased intensity of absorption?

a) Hypochromic
b) Hyperchromic
c) Hypsochromic
d) Bathochromic

A

a) Hypochromic

127
Q

Which of the following is an application of electronic spectroscopy?

a) Detection of impurities
b) Control of purification
c) Study of kinetics of the chemical reaction
d) All of the mentioned

A

d) All of the mentioned

128
Q

What will be the absorbance if %T = 80?

a) 0.5
b) 0.05
c) 0.097
d) 0.97

A

c) 0.097

A = -log(T)

129
Q

Which of the following is a limitation of the Lambert-Beer’s law?

a) Scattering of light due to particles
b) Fluorescence of sample
c) Non-monochromatic radiation
d) All of the mentioned

A

d) All of the mentioned

130
Q

Vibrational spectroscopy involves the transitions falling in the spectral range of ____________

a) 100-1000 cm-1
b) 300-3000 cm-1
c) 400-4000 cm-1
d) 500-5000 cm-1

A

c) 400-4000 cm-1

131
Q

Which of the region of IR spectra appears between (1400-600) cm-1?

a) Functional group region
b) Fingerprint region
c) Low-frequency region
d) None of the mentioned

A

b) Fingerprint region

132
Q

Select the correct statement from the following option.

a) Infrared spectra can identify the unknown materials
b) It can determine the amount of components in a mixture
c) It can also determine the quality of a sample
d) All of the mentioned

A

d) All of the mentioned

133
Q

Which of the following molecule have infrared active vibrations?

a) NO
b) CH4
c) H2
d) All of the mentioned

134
Q

Which of the following cannot show a vibrational absorption spectrum?

a) OCS
b) H2O
c) CO2
d) CH2 = CH2

A

d) CH2 = CH2

135
Q

Which of the following is not a type of bending molecular vibration?

a) Twisting
b) Stretching
c) Wagging
d) Rocking

A

b) Stretching

136
Q

What is the absorption frequency(cm-1) of –C=N functional group?

a) 3610-3640
b) 1690-1760
c) 1180-1360
d) 2850-2960

A

c) 1180-1360

137
Q

Presence of a functional group in a compound can be established by using _____________

a) Chromatography
b) IR spectroscopy
c) Mass spectroscopy
d) X-ray diffraction

A

b) IR spectroscopy

138
Q

Select the incorrect option from the following option.

a) IR spectroscopy helps in the determination of purity
b) IR spectroscopy helps in the determination of force constant from vibrational spectrum
c) IR spectroscopy helps in identifying an unknown compound
d) None of the mentioned

A

d) None of the mentioned

139
Q

IR spectroscopy helps in detecting the presence of hydrogen bonding.

a) True
b) False

140
Q

The nuclei with a spin quantum number greater than _______ can exhibit the NMR phenomenon.

a) 0
b) 5
c) 10
d) -5

141
Q

The number of different orientations which a magnetic nucleus can take is ____________

a) 2I
b) 2I-1
c) 2I+1
d) 4I

142
Q

Number of NMR signals obtained in CH3COCH3will be ____________

a) 6
b) 3
c) 2
d) 1

143
Q

Propene as well as 2-Butene(cis) will show equal number of signals in their NMR spectra.

a) True
b) False

144
Q

Select the incorrect statement from the following option.

a) TMS stands for tetra methyl silane
b) All the hydrogen in TMS have the same chemical shift
c) TMS has a high boiling point, so it is not easily lost when holding the NMR sample
d) TMS is relatively unreactive with most functional groups

A

c) TMS has a high boiling point, so it is not easily lost when holding the NMR sample

145
Q

The NMR spectra of the functional isomers of the molecular formula C2H6O show _________ and _________ signals respectively.

a) 1, 2
b) 1, 3
c) 1, 4
d) 1, 5

146
Q

The number of signals in 1-propanol are _________ while those in 2-propanol are ______

a) 4, 3
b) 4, 2
c) 2, 4
d) 3, 4

147
Q

For NMR spectrum, carbon tetrachloride and water can be successfully used as a solvent.

a) True
b) False

148
Q

In how many ways –CH3 protons can couple with the protons on adjacent carbon atom relative to the external field.

a) 1
b) 2
c) 3
d) 4

149
Q

Which of the following is inversely proportional to the chemical shifts positions (δ)?

a) Frequency of unknown group of protons
b) Frequency of TMS
c) Operating frequency of the instrument
d) All of the mentioned

A

c) Operating frequency of the instrument

ChT Review Q&A (6 decks)

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