Question

Identify the correct statements from the following
I. In Leclanché cell, Mn$^{2+}$ is oxidized to Mn$^{3+}$
II. Electrolysis of aqueous CuCl$_2$ solution using Pt electrodes liberate Cl$_2$ (g) at anode
III. Lead storage battery is a secondary battery

• A. I, II only
• B. I, III only
• C. II, III only
• D. I, II, III

Hint:

Know cell reactions: Leclanché involves MnO$_2$ reduction. Electrolysis favors Cl$_2$ at anode for CuCl$_2$. Secondary batteries are rechargeable. Verify electrode reactions.

Answer 1

The Correct Option is C

1. I: In Leclanché cell, anode (Zn) oxidizes to Zn$^{2+}$; cathode reduces MnO$_2$ to Mn$_2$O$_3$ or MnO(OH), not Mn$^{2+}$ to Mn$^{3+}$, so incorrect.
2. II: Electrolysis of CuCl$_2$ with Pt electrodes: Anode oxidizes Cl$^-$ to Cl$_2$ (g) (2Cl$^-$ $\to$ Cl$_2$ + 2e$^-$), correct.
3. III: Lead storage battery is rechargeable (secondary battery), correct.
4. Thus, II and III are correct, so the answer is (3) II, III only.