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ANAL CHEM > ANAL CHEM 4 > Flashcards

ANAL CHEM 4 Flashcards

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1
Q

Which of the following is the formula for pH calculation?

log10[H+].
-log10[H+].
log2[H+].
-log2[H+].

A

-log10[H+].

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2
Q

Pure water is known to be which of the following?

Weak electrolyte
Strong electrolyte
Neither weak nor strong
Not an electrolyte

A

Weak electrolyte

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3
Q

Which of the following is the value of hydrogen ion concentration of pure water?

1×107 moles/litre
1×105 moles/litre
1×106 moles/litre
1×108 moles/litre

A

1×107 moles/litre

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4
Q

Which of the following is the value of hydroxyl ion concentration of pure water?

1×107 moles/litre
1×105 moles/litre
1×106 moles/litre
1×108 moles/litre

A

1×107 moles/litre

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5
Q

Which of the following is the relation between hydrogen and hydroxyl ion concentration of pure water?

Value of hydrogen ion concentration is greater
Value of hydroxyl ion concentration is greater
They are both always the same
The concentrations keep changing

A

They are both always the same

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6
Q

The Nernst equation is given by which of the following statements?

E=Eo + 2.303 RT/F log CH
E=Eo – 2.303 RT/F log CH
E=Eo + 2.303 RT×F log CH
E=Eo – 2.303 RT×F log CH

A

E=Eo + 2.303 RT/F log CH

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7
Q

Which of the following is the relation between concentration of hydrogen and hydroxyl ions in an acidic solution?

Value of hydrogen ion concentration is greater
Value of hydroxyl ion concentration is greater
They are both always the same
The concentrations keep changing

A

Value of hydrogen ion concentration is greater

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8
Q

Which of the following is the relation between concentration of hydrogen and hydroxyl ions in a basic solution?

Value of hydrogen ion concentration is greater
Value of hydroxyl ion concentration is greater
They are both always the same
The concentrations keep changing

A

Value of hydroxyl ion concentration is greater

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9
Q

The measurement of hydrogen ion concentration can be made by measuring the potential developed in an electrochemical cell.

True
False

A

True

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10
Q

Slope factor is independent of temperature.

True
False

A

False

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11
Q

Which of the following is not the characteristic of a reference electrode?

It must have a known output potential
It must have a constant output potential
Its output potential is dependent on the composition of the solution
It is employed in conjunction with the indicator or working electrode

A

Its output potential is dependent on the composition of the solution

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12
Q

Why is Standard hydrogen electrode called as the primary reference electrode?

It has a known output potential
It has a constant output potential
Its output potential is independent of the composition of the solution
Its output potential is zero volts

A

Its output potential is zero volts

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13
Q

Which of the following is the simple and most convenient hydrogen electrode?

Pascal Hydrogen electrode
Bourne Hydrogen electrode
Hilderbant Hydrogen electrode
West Hydrogen electrode

A

Hilderbant Hydrogen electrode

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14
Q

Which of the following is not the disadvantage of hydrogen electrode?

Platinum can be easily poisoned

Presence of oxidising agents alters the potential

It gives salt error

H2 gas at 1 atmospheric pressure is difficult to set up and transport

A

It gives salt error

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15
Q

In Hydrogen electrode, the electrode is placed in a solution of ____ M HCl. Fill in the blank.

0.5
1
2
3

A

1

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16
Q

Hydrogen electrode which is the reference electrode can be used as which of the following?

Anode only
Cathode only
Anode or Cathode
Salt bridge

A

Anode or Cathode

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17
Q

If hydrogen electrode acts as cathode, hydrogen is reduced.

True
False

A

True

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18
Q

The composition of glass membrane in glass electrode cannot have which of the following?

Sodium silicate
Calcium silicate
Lithium silicate
Barium silicate

A

Barium silicate

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19
Q

Which of the following is the purpose of added membranes in the glass membrane of the glass electrode?

They act as tightners
They act as filters
They act as conditioners
They act as collectors

A

They act as tightners

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20
Q

Which of the following cannot form the inner reference electrode in glass electrodes?

Silver electrode
Copper electrode
Calomel electrode
Silver chloride electrode

A

Copper electrode

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21
Q

The pH response of glass electrode is limited entirely to the area of the special glass membrane bulb.

True
False

A

True

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22
Q

Which of the following is not the advantage of glass electrodes?

It gives accurate results for high as well as low pH values

It is simple to operate

It has no salt error

Modern electrodes can withstand severe treatment

A

It gives accurate results for high as well as low pH values

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23
Q

Which of the following cannot be used as secondary reference electrode?

Calomel electrode
Silver-silver chloride electrode
Mercury-mercury sulphate electrode
Glass electrode

A

Glass electrode

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24
Q

Which of the following is known as calomel?

Silver chloride
Mercury chloride
Potassium chloride
Mercury sulphate

A

Mercury chloride

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25
Q

The calomel electrodes are classified based on which of the following?

Materials used in the electrode
Amount of mercury present
Concentration of Kcl
Purity of mercury

A

Concentration of Kcl

26
Q

Which of the following calomel electrodes are used for accurate work?

Saturated calomel electrode
Electrode with 0.1M Kcl
Electrode with 1M Kcl
Electrode with 2M Kcl

A

Electrode with 0.1M Kcl

27
Q

Calomel electrode can behave as which of the following components?

Anode only
Cathode only
Anode or cathode
Salt bridge

A

Anode or cathode

28
Q

When the calomel electrode acts as the cathode which of the following does not occur?

Mercury ions are discharged at the electrode

More calomel passes into the solution

There is a decrease in the concentration of chloride ions

There is an increase in the concentration of chloride ions

A

There is an increase in the concentration of chloride ions

29
Q

Which of the following is not the characteristics of calomel electrode?

The potential of electrode is not temperature dependent

Preparation of electrode is easy

Value of potential or emf is higher for lower concentration of Kcl

Value of potential decreases with increasing concentration of Kcl

A

The potential of electrode is not temperature dependent

30
Q

Which of the following is not the characteristics of silver/silver chloride electrode?

These electrodes have good electrical and chemical stability

It can be used in temperatures greater than 600oC

It can be used in places or solutions that have strong reducing agents

It should not be used in solutions that contain proteins, sulphide or bromide

A

It can be used in places or solutions that have strong reducing agent

31
Q

While using reference electrodes, the internal liquid level should always be kept above that of the sample solution.

True
False

A

True

32
Q

Which of the following salt bridge solutions must be used for silver/silver chloride electrode?

Saturated KCl
Saturated K2SO4
Saturated LiCl
Saturated KNO3

A

Saturated KCl

33
Q

LiCl salt bridge is more suitable in organic solvents than KCl.

True
False

A

True

34
Q

pH meters can be considered as voltage sources with which of the following internal resistances?

Very low resistance
Moderate resistance
Very high resistance
No resistance

A

Very high resistance

35
Q

The electrodes used in pH measurement have which of the following internal resistances?

Very low resistance
Moderate resistance
Very high resistance
No resistance

A

Very high resistance

36
Q

Which of the following is not a failure in pH meters?

Defective electrodes
Defective input circuitry
Defective electronic circuitry
Defective calibration

A

Defective calibration

37
Q

Which of the following is the simplest of pH meters?

Null-detector type pH meter
Direct reading type pH meter
Digital pH meter
Modern pH meter

A

Null-detector type pH meter

38
Q

In which of the following ways can zero drift be reduced in pH meters?

Using filter
Giving zero adjustment arrangement
Keeping the input impedance high
Using balanced and differential amplifiers

A

Using balanced and differential amplifiers

39
Q

Which of the following can be used to provide automatic temperature compensation?

Proper insulation
Calibration for different temperatures
Thermistor
Thermometer

A

Thermistor

40
Q

Which of the following is not the characteristic of null-detector type pH meter?

It can be battery operated
It has less accuracy
It is easy to maintain
Its electronic circuits are simple

A

Its electronic circuits are simple

41
Q

Which of the following is not the characteristic of direct reading type pH meters?

Simple operation
Quick to use
Continuous indication output
It requires balancing process

A

Quick to use

42
Q

Which of the following is not the characteristic of chopper amplifier pH meter?

Direct voltage from the electrodes is chopped at the main frequency

Using choppers for high-input resistance gives rise to spikes of waveforms at the output

It leads to stability in DC output of phase-sensitive rectifier

Magnitude of surge increases in the glass electrode output

A

It leads to stability in DC output of phase-sensitive rectifier

43
Q

In which of the following ways can the disadvantages of chopper amplifier type pH meter be overcome?

Using zero corrected DC amplifier
Using modern design
Using digital design
Using vibrating condenser

A

Using vibrating condenser

44
Q

The zero stability of vibrating condenser amplifier type pH meter is much better than direct coupled amplifier.

True
False

A

True

45
Q

In vibrating condenser amplifier type pH meter, to maintain good performance which of the following has to be done?

Frequency of the vibrator should be stable

Frequency of the vibrator should be constant

Amplitude of the vibrator should be constant

Both frequency and amplitude of the vibrator should be constant and stable

A

Both frequency and amplitude of the vibrator should be constant and stable

46
Q

If an instrument fails to balance at zero, it is most likely that the electrodes are defective.

True
False

A

False

47
Q

Given below is the block diagram of digital pH meter. Identify the unmarked component.

Filter
Buffer
A/D converter
D/A converter

A

A/D converter

48
Q

Which of the following is not the characteristic of ion selective electrodes?

It is fragile
Easy to use
Available in different sizes and shapes
It is insensitive to many ions

A

It is fragile

49
Q

In glass membrane electrode, the glass containing 11% Na2O, 18% Al2O3, 71% SiO2 is highly sensitive to which of the following ions?

Sodium
Hydrogen
Nitrogen
Chlorine

A

Sodium

50
Q

In liquid membrane electrode, the liquid ion exchanger is held in a porous disc of _____________

Solid material
Semi-permeable membrane
Hydrophobic material
Water absorbing material

A

Hydrophobic material

51
Q

In recent liquid membrane electrodes, the porous liquid membrane is replaced with which of the following?

Polyvinyl chloride
Polyacryl chloride
Polyester membrane
Polyacryl amide

A

Polyvinyl chloride

52
Q

Which of the following is used in potassium electrode in liquid membrane electrodes?

Ionomycin
Valinomycin
Nonactin
Gramicidin

A

Valinomycin

53
Q

In solid state membranes, the body of the electrodes are made of which of the following?

Polyvinyl chloride
Plastic
Polythene
Teflon

A

Teflon

54
Q

Which of the following is not the characteristic of ion selective electrodes?

Simple to use
Inexpensive
Narrow concentration range
Operates in wide range of temperature

A

Narrow concentration range

55
Q

Ion selective electrode are unaffected by colour or turbidity of the solution.

True
False

A

True

56
Q

Which of the following is not a problem of ion selective electrodes?

Interference with other ions

Output is influences by ionic strength

Drift in electrode potential during a sequence of measurements

Can measure only positive ions

A

Can measure only positive ions

57
Q

Which of the following is the effective concentration measured at the electrode head?

Selectivity co-efficient
Ionic strength
Activity
Activity co-efficient

A

Activity

58
Q

The value of activity co-efficient is always in which of the following ranges?

Zero
Less than zero
Less than 1
Greater than 1

A

Greater than 1

59
Q

Which of the following specifies the relation between ionic strength and activity co-efficient?

Directly proportional
Inversely proportional
Equal
No particular relation

A

Inversely proportional

60
Q

The difference between measured activity and actual concentration becomes higher at higher concentration. Is this statement true or false?

True
False

A

True

61
Q

Ion selective electrodes have ________ linear range and _________ detection limit than the pH electrode.

Lower, lower
Lower, higher
Higher, lower
Higher, higher

A

Lower, higher

62
Q

END

A

END

ANAL CHEM (5 decks)

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