Question

Which of the following reactions occurs at the cathode?
(a) Sn²⁺ → Sn⁴⁺ + 2 e⁻
(b) Ag⁺ + e⁻ → Ag
(c) Zn → Zn²⁺ + 2 e⁻
(d) 2OH⁻ → H₂O + 1/2 O₂ + 2e⁻

Answer 1

Ag⁺+e→⁻Ag

Explanation:

The cathode reaction is where reduction occur and electrons are gained.

Sn²⁺→Sn⁴⁺+2 e⁻

In this reaction electrons are lost. So, it is not a Cathode reaction.

Ag⁺+e→⁻Ag

Here electron is gained by Ag⁺.So, it is a Cathode reaction.

Zn→Zn²⁺+2e⁻

In this reaction electrons are lost by Zn. So, it is not a Cathode reaction.

2OH⁻→H₂O+1/2 O₂+2e⁻

In this reaction electrons are lost . So, it is not a Cathode reaction.

Answer 2

Hello Friend..!!

The answer of your question is..!!

Option.D

Thank you..!!