Solutions of chapter 3. Electrochemistry | Chemistry - Exemplar

1

Which cell will measure standard electrode potential of copper electrode?

2

Electrode potential for Mg electrode varies according to the equation

. The graph of vs log [Mg²⁺] is

3

Which of the following statement is correct?

4

The difference between the electrode potentials of two electrodes when no current is drawn through the cell is called ___________.

5

Which of the following statement is not correct about an inert electrode in a cell?

6

An electrochemical cell can behave like an electrolytic cell when _________.

7

Which of the statements about solutions of electrolytes is not correct?

8

Using the data given below find out the strongest reducing agent.

9

Use the data given in Q.8 and find out which of the following is the strongest oxidising agent.

10

Using the data given in Q.8 find out in which option the order of reducing power is correct.

11

Use the data given in Q.8 and find out the most stable ion in its reduced form.

12

Use the data of Q.8 and find out the most stable oxidised species.

13

The quantity of charge required to obtain one mole of aluminium from Al₂O₃ is ___________.

14

The cell constant of a conductivity cell _____________.

15

While charging the lead storage battery ______________.

16

is equal to __________________.

17

In the electrolysis of aqueous sodium chloride solution which of the half-cell reaction will occur at anode?

18

The positive value of the standard electrode potential of Cu²⁺/Cu indicates that ____________.

19

for some half cell reactions are given below. On the basis of these mark the correct answer.

(a)

(b)

(c)

20

= 1.1 V for Daniel cell. Which of the following expressions are correct description of state of equilibrium in this cell?

21

Conductivity of an electrolytic solution depends on ____________.

22

is equal to ___________.

23

What will happen during the electrolysis of aqueous solution of CuSO₄ by using platinum electrodes?

24

What will happen during the electrolysis of aqueous solution of CuSO₄ in the presence of Cu electrodes?

25

Conductivity κ is equal to ____________.

26

Molar conductivity of ionic solution depends on ___________.

27

For the given cell, Mg|Mg²⁺|| Cu²⁺|Cu

1

Which cell will measure standard electrode potential of copper electrode?

2

Electrode potential for Mg electrode varies according to the equation

. The graph of vs log [Mg²⁺] is

3

Which of the following statement is correct?

4

The difference between the electrode potentials of two electrodes when no current is drawn through the cell is called ___________.

5

Which of the following statement is not correct about an inert electrode in a cell?

6

An electrochemical cell can behave like an electrolytic cell when ____________.

7

Which of the statements about solutions of electrolytes is not correct?

8

Using the data given below find out the strongest reducing agent.

9

Use the data given in Q.8 and find out which of the following is the strongest oxidising agent.

10

Using the data given in Q.8 find out in which option the order of reducing power is correct.

11

Use the data given in Q.8 and find out the most stable ion in its reduced form.

12

Use the data of Q.8 and find out the most stable oxidised species.

13

The quantity of charge required to obtain one mole of aluminium from Al₂O₃ is ___________.

14

The cell constant of a conductivity cell _____________.

15

While charging the lead storage battery ______________.

16

is equal to __________________.

17 II.

In the electrolysis of aqueous sodium chloride solution which of the half-cell reaction will occur at anode?

18

The positive value of the standard electrode potential of Cu²⁺/Cu indicates that ____________.

19

for some half cell reactions are given below. On the basis of these mark the correct answer.

(a)

(b)

(c)

20

= 1.1 V for Daniel cell. Which of the following expressions are correct description of state of equilibrium in this cell?

21

Conductivity of an electrolytic solution depends on ____________.

22

is equal to ___________.

23

What will happen during the electrolysis of aqueous solution of CuSO₄ by using platinum electrodes?

24

What will happen during the electrolysis of aqueous solution of CuSO₄ in the presence of Cu electrodes?

25

Conductivity κ is equal to ____________.

26

Molar conductivity of ionic solution depends on ___________.

27

For the given cell, Mg|Mg²⁺|| Cu²⁺|Cu

28

Can absolute electrode potential of an electrode be measured?

29

Canfor cell reaction ever be equal to zero?

30

Under what condition is E_Cell = 0 or Δ_rG = 0?

31

What does the negative sign in the expression mean?

32

Aqueous copper sulphate solution and aqueous silver nitrate solution are electrolysed by 1 ampere current for 10 minutes in separate electrolytic cells. Will, the mass of copper and silver, deposited on the cathode be the same or different? Explain your answer.

33

Depict the galvanic cell in which the cell reaction is Cu + 2Ag⁺→ 2Ag + Cu²⁺

34

Value of standard electrode potential for the oxidation of Cl^– ions is more positive than that of water, even then in the electrolysis of aqueous sodium chloride, why is Cl^–oxidised at anode instead of water?

35

What is electrode potential?

36

Consider the following diagram in which an electrochemical cell is coupled toan electrolytic cell. What will be the polarity of electrodes ‘A’ and ‘B’ in the electrolytic cell?

37

Why is alternating current used for measuring the resistance of an electrolytic solution?

38

A galvanic cell has an electrical potential of 1.1V. If an opposing potential of 1.1V is applied to this cell, what will happen to the cell reaction and current flowing through the cell?

39

How will the pH of brine (aq. NaCl solution) be affected when it is electrolyzed?

40

Unlike dry cell, the mercury cell has a constant cell potential throughout its useful life. Why?

41

Solutions of two electrolytes ‘A’ and ‘B’are diluted. The of ‘B’ increases 1.5 times while that of A increases 25 times. Which of the two is a strong electrolyte? Justify your answer.

42

When acidulated water (dil.H₂SO₄ solution) is electrolysed, will the pH of the solution be affected? Justify your answer.

43

In an aqueous solution, how does specific conductivity of electrolytes change with the addition of water?

44

Which reference electrode is used to measure the electrode potential of other electrodes?

45

Consider a cell given below

Cu|Cu²⁺|| Cl^—|Cl₂, Pt

Write the reactions that occur at anode and cathode

46

Write the Nernst equation for the cell reaction in the Daniel cell. How will the E_Cell be affected when the concentration of Zn²⁺ ions is increased?

47

What advantage do the fuel cells have over primary and secondary batteries?

48

Write the cell reaction of a lead storage battery when it is discharged. How does the density of the electrolyte change when the battery is discharged?

49

Why on dilution the of CH₃COOH increases drastically, while that of CH₃COONa increases gradually?

28

Can absolute electrode potential of an electrode be measured?

29

Canfor cell reaction ever be equal to zero?

30

Under what condition is E_Cell = 0 or Δ_rG = 0?

31

What does the negative sign in the expression mean?

32

Aqueous copper sulphate solution and aqueous silver nitrate solution are electrolysed by 1 ampere current for 10 minutes in separate electrolytic cells. Will, the mass of copper and silver, deposited on the cathode be the same or different? Explain your answer.

33

Depict the galvanic cell in which the cell reaction is Cu + 2Ag⁺→ 2Ag + Cu²⁺

34

Value of standard electrode potential for the oxidation of Cl^– ions is more positive than that of water, even then in the electrolysis of aqueous sodium chloride, why is Cl^–oxidised at anode instead of water?

35

What is electrode potential?

36

Consider the following diagram in which an electrochemical cell is coupled toan electrolytic cell. What will be the polarity of electrodes ‘A’ and ‘B’ in the electrolytic cell?

37

Why is alternating current used for measuring the resistance of an electrolytic solution?

38

A galvanic cell has an electrical potential of 1.1V. If an opposing potential of 1.1V is applied to this cell, what will happen to the cell reaction and current flowing through the cell?

39

How will the pH of brine (aq. NaCl solution) be affected when it is electrolyzed?

40

Unlike dry cell, the mercury cell has a constant cell potential throughout its useful life. Why?

41

Solutions of two electrolytes ‘A’ and ‘B’are diluted. The of ‘B’ increases 1.5 times while that of A increases 25 times. Which of the two is a strong electrolyte? Justify your answer.

42

When acidulated water (dil.H₂SO₄ solution) is electrolysed, will the pH of the solution be affected? Justify your answer.

43

In an aqueous solution, how does specific conductivity of electrolytes change with the addition of water?

44

Which reference electrode is used to measure the electrode potential of other electrodes?

45

Consider a cell given below

Cu|Cu²⁺|| Cl^—|Cl₂, Pt

Write the reactions that occur at anode and cathode

46

Write the Nernst equation for the cell reaction in the Daniel cell. How will the E_Cell be affected when the concentration of Zn²⁺ ions is increased?

47

What advantage do the fuel cells have over primary and secondary batteries?

48

Write the cell reaction of a lead storage battery when it is discharged. How does the density of the electrolyte change when the battery is discharged?

49

Why on dilution the of CH₃COOH increases drastically, while that of CH₃COONa increases gradually?

50

Match the terms given in Column I with the units given in Column II.

51

Match the terms given in Column I with the items given in Column II.

52

Match the items of Column I and Column II.

53

Match the items of Column I and Column II.

54

Match the items of Column I and Column II.

55

Match the items of Column I and Column II on the basis of data given below:

50

Match the terms given in Column I with the units given in Column II.

51

Match the terms given in Column I with the items given in Column II.

52

Match the items of Column I and Column II.

53

Match the items of Column I and Column II.

54

Match the items of Column I and Column II.

55

Match the items of Column I and Column II on the basis of data given below:

56

Assertion : Cu is less reactive than hydrogen.

Reason : is negative

57

Assertion : E_Cell should have a positive value for the cell to function.

Reason : E_cathode < E_anode

58

Assertion : Conductivity of all electrolytes decreases on dilution.

Reason : On dilution number of ions per unit volume decreases.

59

Assertion : for weak electrolytes shows a sharp increase when the electrolytic solution is diluted.

Reason : For weak electrolytes degree of dissociation increases with dilution of solution.

60

Assertion : Mercury cell does not give steady potential.

Reason : In the cell reaction, ions are not involved in solution.

61

Assertion : Electrolysis of NaCl solution gives chlorine at anode instead of O₂.

Reason : Formation of oxygen at anode requires overvoltage.

62

Assertion : For measuring resistance of an ionic solution an AC source is used.

Reason : Concentration of ionic solution will change if

DC source is used.

63

Assertion : Current stops flowing when E_Cell = 0.

Reason : Equilibrium of the cell reaction is attained.

64

Assertion : Ag⁺/Ag increases with increase in concentration of Ag+ ions.

Reason : Ag⁺/Ag has a positive value.

65

Assertion : Copper sulphate can be stored in zinc vessel.

Reason : Zinc is less reactive than copper.

56