Question

Observe the following statements about dry cell:
It is a primary battery.
Zinc vessel acts as cathode.
A paste of moist \( \text{NH}_4\text{Cl}, \text{MnO}_2 \), and \( \text{ZnCl}_2 \) is present between two electrodes.
The potential of this cell is 1.5 V.

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

Hint:

In a dry cell, Zinc acts as the anode (not cathode) and graphite (carbon) rod acts as the cathode. MnO\textsubscript{2} acts as the depolarizer.

Answer 1

The Correct Option is C

Step 1: Understand the components of a dry cell

• Primary battery: Correct. A dry cell is a non-rechargeable (primary) battery.
• Zinc vessel acts as cathode: Incorrect. Zinc acts as the anode (oxidation takes place here).
• Electrolyte paste: Correct. Contains moist \( \text{NH}_4\text{Cl} \), \( \text{MnO}_2 \), and \( \text{ZnCl}_2 \).
• Potential: Correct. Standard dry cell potential is approximately 1.5 V.

Step 2: Evaluate the options

• Statement II is incorrect.
• All other statements (I, III, IV) are correct.

Final Answer:

I, III, IV only