Which of the following is not correct for dry cell?
Correct answer: D. NH3 gas is liberated out
- A. Zinc is used as anode
- B. Manganese is reduced from + 4 to + 3 state
- C. It is a primary cell
- D. NH3 gas is liberated out
Explanation
The correct answer is Option D: NH3 gas is liberated out. In a dry cell, ammonia is not released as a gas. Instead, it reacts further to form a complex ion, [Zn(NH3)4]2+. This misunderstanding could arise because ammonia is indeed a product, but it does not escape as a gas. Option A correctly states that zinc is used as the anode in a dry cell. Option B accurately describes the reduction of manganese from an oxidation state of +4 to +3. Option C correctly identifies the dry cell as a primary cell, which is non-rechargeable.
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