Question

The standard electrode potentials of Zn, Ag and Cu are -0.76, +0.80 and +0.34 V respectively. Identify the correct statement from the following.

• A. Ag can oxidize Zn and Cu
• B. Ag can reduce Zn\(^{2+}\) and Cu\(^{2+}\)
• C. Zn can reduce Ag\(^+\) and Cu\(^{2+}\)
• D. Cu can oxidize Zn and Ag

Hint:

A simple rule to remember is: a metal can "displace" or reduce the ions of any metal below it in the reactivity series (or above it in the standard potential series).
Here, Zn is the most reactive, so it can reduce both Cu\(^{2+}\) and Ag\(^+\).

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
Given E°: Zn=-0.76V, Cu=+0.34V, Ag=+0.80V. Find correct statement.

Step 2: Key Concept (Alternate):
More negative E° = stronger reducing agent. Metal with lower E° reduces ions of metal with higher E°.

Step 3: Detailed Explanation:
Zn has most negative E°, strongest reducer. Zn reduces both Cu²⁺ and Ag⁺. Ag cannot reduce Zn²⁺ or Cu²⁺. Cu can reduce Ag⁺ but not Zn²⁺.

Step 4: Final Answer:
Zn can reduce Ag⁺ and Cu²⁺.