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Mistakes Flashcards

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1
Q

Fugacity of a leaving group depends upon

A

The basicity of the leaving group.

If the leaving group forms a weak base, it is more fugative.

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2
Q

How many chiral atoms does lactic acid have?

A

1

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3
Q

Alkylation of morphine gives

A

Heroin

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4
Q

Acetylation of morphine gives

A

Codeine

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5
Q

Which flouride of xenon cannot be stored in glass vessels?

A

XeF6

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6
Q

Which chloride of mercury gives a black precipitate on reaction with NH4OH?

A

Hg2Cl2

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7
Q

Which chloride of mercury gives a white precipitate on reaction with NH4OH and red precipitate with KOH?

A

HgCl2

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8
Q

What is obtained as product when phenol reacts with pyrimidine?

A

Phenoxide ion

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9
Q

The distance between an octahedral and tetrahedral void in fcc lattice would be

A

√(3)/4

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10
Q

For a reaction A + B —> C + 60 kJ

if forwards activation energy is 40 kJ/mol then activation energy of backward reaction will be

A

100kJ

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11
Q

Is tetracarbonylnickel (0) paramagnetic or diamagnetic?

A

Diamagnetic

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12
Q

Is tetrachloronickel (II) paramagnetic or diamagnetic?

A

Paramagnetic

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13
Q

How many geometrical isomers does the following have?

[Pt(NH3)(NH2OH)(H2O)(Py)]

A

3

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14
Q

Which oxide of nitrogen is called a mixed anhydride and why?

A

H2O + 2 NO2 ⇄ HNO3 + HNO2
Mixed anhydride are the compound that react with water to form a mixture of two acidic anhydride. So NO2 is a mixed anhydride.

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15
Q

Is gadolinium a lanthanide or actinide?

A

Lanthanide

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16
Q

WHen temporary hard water containing Mg(HCO3)2 is boiled the ppt. formed is of

A

Mg(OH)2

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17
Q

Is acetic acid a stronger acid in water or in NH3?

A

In NH3, because NH3 is a stronger base.

concept of acid and base is relative, so in a stronger base it acts as a stronger acid

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18
Q

What is the arrangement of electron gain enthalpy (with negative sign) in increasing order for O, Cl, F and S?

A

O

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19
Q

Cisplatin is in organometallic compound. True/false?

A

False.

It is a coordination compound.

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20
Q

Which is the most thermodynamically stable allotrope of phosphorus?

A

Black phosphorus

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21
Q

Which carbonate among the carbonated of second group is the least stable?

A

BeCO3

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22
Q

What is the correct increasing order of ionic radii of Y3+, La3+, Eu3+ and Lu3+?

A

Y3+ < Lu3+ < Eu3+

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23
Q

Sodium is made by the electrolysis of molten mixture of about 30% NaCl and 60% CaCl2. Why?

A

This mixture as a lower melting point than pure NaCl

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24
Q

Heating primary alcohol in H2SO4 at 443K gives

A

Alkene

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25
Q

Heating primary alcohol in H2SO4 at 410K gives

A

Ether

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26
Q

What is hydrolith?

A

Calcium hydride

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27
Q

What type of bonds are present in beryllium hydroxide and magnesium hydride?

A

Banana bonds (polymeric compounds)

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28
Q

What kind of deviation does the azeotropic mixture of water and ethanol which show a lower boiling point than both the individual solutions show?

A

Positive deviation

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29
Q

Which compound is obtained on dissolving metallic zinc in excess of Naoh

A

Na2ZnO2

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30
Q

What products are obtained on decomposition of AgNO3?

A

Silver, oxygen and Nitrogen dioxide

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31
Q

Which products are obtained on decomposition of NH4NO3?

A

N2O and water

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32
Q

Which products are obtained on decomposition of LiNO3?

A

lithium oxide (Li2O), oxygen (O2) and nitrogen dioxide (NO2)

33
Q

At high pressure all real gases have Z>1 while at moderate pressure most gases have Z<1. True/false?

A

True

34
Q

Vanderwaal constant ‘a’ is a measure of attractive forces within the gas and is independent of temperature and pressure. True/false?

A

True

35
Q

Greater the critical temperature of a gas, less easily it will be liquified. True/false?

A

False. Greater the critical temperature of a gas, more easily it will be liquified.

36
Q

What is the critical temperature of a gas?

A

The critical temperature of a gas is that temperature above which it cannot be liquefied by pressure.

37
Q

In the extraction of which metal is poling used?

A

Copper

38
Q

What is the correct order of basic strength of NiO, K2O, MgO and Cs2O?

A

NiO

39
Q

What is the correct order of solubility of Na2Co3, K2Co3 and Li2Co3?

A

Li2Co3

40
Q

What is the correct order of thermal stability of NH3, PH3 and AsH3?

A

NH3>PH3>AsH3

41
Q

What is the expression relating radius of cation, anion and side of unit cell in expressions is correct in case of CsCl unit cell?

A

R(cation) +R(anion) = √3a/2

42
Q

Which is more acidic- formic acid or 3-chloropropanoic acid?

A

Formic acid

43
Q

Which is more acidic- alcohol or alkyne?

A

Alcohol

44
Q

Is cyclooctatetraene anti-aromatic?

A

No, because it is non planar.

45
Q

How many gaseous products are formed when any lanthanoid reacts with oxygen, acid, sulphur, halogen, nitrogen, carbon or water?

A

2

Hydrogen gas is formed in the case of acids and water

46
Q

What is formed by the decomposition of Fe2(SO4)3?

A

Fe2O3 and SO2

47
Q

According to Schrodinger model, nature of electron in an atom is

A

Wave

48
Q

What is poling in metallurgy?

A

Reduction of oxides of impurities during refining of metal using hydrocarbons (green logs of wood).

49
Q

Which monomers are better for chain growth polymerisation?

A

The ones which can form stable carbocations.

50
Q

What is the correct order of acidic strength of HClO, HIO and HBrO?

A

HClO > HBrO > HIO

51
Q

What is the correct order of acidic strength of H3PO2, H3PO4, H3PO3?

A

H3PO2 > H3PO3 > H3PO4

52
Q

For non-ideal solution showing negative deviation from ideal behaviour what is the sign of change in entropy?

A

ΔS > 0

53
Q

Which ion is more stable in aqueous medium- Cr3+ or Mn3+?

A

Cr3+

54
Q

Number of degenerate orbitals present in 3rd shell of Li2+ ion is

A

9

55
Q

Which has higher value of Kb (Ionization constant of base): p-methoxyaniline or p-methylaniline?

A

p-methoxyaniline

56
Q

What type of magnetic substance is Fe3O4?

A

Ferrimagnetic

57
Q

Which is the least stable metal carboxyl among the following?

V(CO)6, [Co2(CO)8], [Mn2(CO)10], Cr(CO)6

A

V(CO)6

58
Q

Consider the following reaction at equilibrium
N2(g) + 3H2(g) —> 2NH3(g)
If helium gas is introduced to the above equilibrium at constant pressure then

A

Reaction proceeds backward

59
Q

Why does reaction proceed towards the direction of more number of atoms when inert gas is added at constant pressure in a reaction mixture?

A

When an inert gas is added to the system in equilibrium at constant pressure, then the total volume will increase. Hence, molarity of reactants and products will decrease. The equilibrium will shift towards the direction in which there is increase in number of moles of gases.

60
Q

Is the dielectric constant of H2O more orD2O?

A

H2O

61
Q

What type of isomers are Isobutyl alcohol and tertiary butyl alcohol?

A

Position isomers

62
Q

The distance between nearest tetrahedral voids of CCP unit cell is

A

a/2

63
Q

What are extensive properties?

A

an extensive quantity is one whose magnitude is dependent on mass

64
Q

What are intensive properties?

A

Intensive properties are independent of the mass of system.

65
Q

Is gold sol positively or negatively charged?

A

Negatively charged

66
Q

For hydrolysis of the following functional groups, the decreasing order of reactivity is

RCOOR RCOCI RCONH2

A

RCOCI > RCOOR > RCONH2

67
Q

If ΔU° for combustion of methane is – x kJ mol–1, then the value of ΔH° is

A

< -x kJ mol-1

68
Q

Is Fe(OH)3 sol negatively charged?

A

No, it is positively charged.

69
Q

During the process C2 the electron has been added to which of the following molecular orbital?

A

Sigma z

70
Q

Are all the bond lengths the same in SF6?

A

yes

71
Q

O–O bond length in gas phase is more than that in solid phase. True/false?

A

True.

72
Q

O–H bond length in gas phase is more than that in solid phase. True/false?

A

False. O–H bond length in solid phase is more than that in gas phase.

73
Q

4HCl + O2 ————–> 2Cl2 + 2H2O.

The above reaction is catalysed by

A

Cupric chloride

74
Q

When borax is heated in a Bunsen burner flame with CoO on a loop of platinum wire, a compound A is formed. The colour and formula of the compound A is

A

Blue and Co(BO2)2

75
Q

The maximum limit of Nitrate ion in drinking water is

A

50 ppm

76
Q

On treating Na2S with sodium nitroprusside, a violet coloured compound is formed. The formula of compound is:

A

Na4[Fe(CN)5NOS]

77
Q

“Metals are usually not found as nitrates in their ores”.

Out of the following two (a and b) reasons which is/are true for the above observation?

(a) Metal nitrates are highly unstable.
(b) Metal nitrates are highly soluble in water.

A

A is false, but B is true

78
Q

The electrolytic reduction of nitrobenzene in strongly acidic medium produces

A

p–Aminophenol

79
Q

Treatment of cyclopentanone with methyl lithium gives which of the following species?

A

Cyclopentanonyl anion

Chemistry (4 decks)

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