Extra Questions for Class 12 Chemistry Chapter 3 Electrochemistry

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Extra Questions for Class 12 Chemistry Chapter 3 Electrochemistry

Q1. What is the necessity to use a salt bridge in a Galvanic cell?

Q2. Out of HCl and NaCl, which do you expect will have greater value for Lm and why?

Q3. Give reason :
On the basis of E° values, O2 gas should be liberated at anode but it is Cl2 gas which is liberated in the electrolysis of aqueous NaCl.

Q4. Limiting molar conductivity of an electrolyte cannot be determined experimentally. Why

Q5. Following reactions occur at cathode during the electrolysis of aqueous silver chloride solution :

On the basis of their standard reduction electrode potential (E°) values, which reaction is feasible at the cathode and why?

Q6. Express the relation between conductivity and molar conductivity of a solution held in a cell?

Q7. (i) Explain why fluorine is the strongest oxidising agent?
(ii) Lithium metal is the strongest reducing agent. Why?

Q8. In the plot of molar conductivity (Lm) vs square root of concentration (c1/2),following curves are obtained for two electrolytes A and B.

Answer the following :
(i) Predict the nature of electrolytes A and B.
(ii) What happens on extrapolation of ∧m to concentration approaching zero for electrolytes A and B?

Q9. Two half-reactions of an electrochemical cell are given below :

Q10. The conductivity of 0.001 M acetic acid is 4 × 10–5 S/cm. Calculate the dissociation constant of acetic acid, if molar conductivity at infinite dilution for acetic acid is 390 S cm 2/mol.

Q11. A copper-silver cell is set up. The copper ion concentration is 0.10 M. The concentration
of silver ion is not known. The cell potential when measured was 0.422 V. Determine the concentration of silver ions in the cell.

Q12. Out of HCl and NaCl, which do you expect will have greater value for ∧m and why?

Q13. Following reactions occur at cathode during the electrolysis of aqueous copper (II) chloride
solution :

On the basis of their standard reduction electrode potential (E°) values, which reaction is feasible at the cathode and why?

Q14. The standard electrode potential (E°) for Daniell cell is +1.1 V. Calculate the DrG° for the reaction.

Q15. What is the difference between electronic and electrolytic conductors?

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