CBSE Class 12 Chemistry Electrochemistry (1). Students can download these worksheets and practice them. This will help them to get better marks in examinations. Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

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

the cell is called ___________.

2. Under what condition an electrochemical cell can behave like an electrolytic cell ?

3. What is the quantity of charge in faraday is required to obtain one mole of aluminum from Al2O3 ?

4. How the cell constant of a conductivity cell changes with change of electrolyte, concentration

and temperature?

5. What will happen at anode during the electrolysis of aqueous solution of CuSO4 in the presence of Cu

electrodes?

6. Under what condition is ECell = 0 or ΔrG = 0 ?

OR Give the condition for Daniell Cell in which there is no flow of electrons or current.

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

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

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

10. Mention the purpose of salt-bridge placed between two half-cells of a galvanic cell?

11. Two metals A and B have electrode potential values of – 0.25V and 0.80V respectively. Which of these will

liberate hydrogen gas from dilute H2SO4 ?

12. What is the effect of temperature on molar conductivity?

13. What is the role of ZnCl2 in the dry cell ?

14. Why is the equilibrium constant K, related to only E° cell and not Ecell ?

15.Rusting of iron is quicker in saline water than in ordinary water. Why is it so?

16. Why rusting of iron prevented in alkaline medium?

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

the cell is called ___________.

2. Under what condition an electrochemical cell can behave like an electrolytic cell ?

3. What is the quantity of charge in faraday is required to obtain one mole of aluminum from Al2O3 ?

4. How the cell constant of a conductivity cell changes with change of electrolyte, concentration

and temperature?

5. What will happen at anode during the electrolysis of aqueous solution of CuSO4 in the presence of Cu

electrodes?

6. Under what condition is ECell = 0 or ΔrG = 0 ?

OR Give the condition for Daniell Cell in which there is no flow of electrons or current.

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

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

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

10. Mention the purpose of salt-bridge placed between two half-cells of a galvanic cell?

11. Two metals A and B have electrode potential values of – 0.25V and 0.80V respectively. Which of these will

liberate hydrogen gas from dilute H2SO4 ?

12. What is the effect of temperature on molar conductivity?

13. What is the role of ZnCl2 in the dry cell ?

14. Why is the equilibrium constant K, related to only E° cell and not Ecell ?

15.Rusting of iron is quicker in saline water than in ordinary water. Why is it so?

16. Why rusting of iron prevented in alkaline medium?

17. 1 mole KCl dissolved in 500 cc of the solution, Due to more mobility of ions and more degree of

dissociation.

115

18. Recharging is possible in this case because PbSO4 formed during discharging is a sticky solid which

sticks to the electrode. Therefore it can either take up or give up electrons during recharge.

19. Bisphenol

20. Coulomb/ mol

ELECTROCHEMISTRY

TWO Marks Each

1.Solutions of two electrolytes ‘A’ and ‘B’ are diluted. The Λm of ‘B’ increases 1.5 times while that of A

increases 25 times. Which of the two is a strong electrolyte? Justify your answer.

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

Justify your answer.

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

4. How does the density of the electrolyte change when the lead storage battery is discharged ?

5. Why on dilution the Λm of CH3COOH increases drastically, while that of CH3COONa increases

gradually?

6. What is the relationship between Gibbs free energy of the cell reaction in a galvanic cell and the emf

of the cell? When will the maximum work be obtained from a galvanic cell?

7.Define corrosion. Write chemical formula of rust.

8.Can you store copper sulphate solutions in a zinc pot?

9.Write the cell reaction which occur in the lead storage battery

(a) when the battery is in use (b) when the battery is on charging.

10.Write the product of electrolysis of aqueous copper sulphate by using platinum electrode.

Answer

1.Electrolyte ‘B’ is strong as on dilution the number of ions remains the same, only interionic attraction

decreases therefore increase in ∧ is small.

2.pH of the solution will not be affected as[ H+] remains constant.

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