Chemistry - Hydrogen and Its compound Question with Solution | TestHub

1. Dihydrogen (H₂) acts as a reducing agent and reduces metal ions having positive standard reduction potential.

2. Cu²⁺ and Pd²⁺ are reduced by H₂ to their respective metals:

$$C{u}^{2+}+H_2\to Cu+2H^{+}$$

$$P{d}^{2+}+H_2\to Pd+2H^{+}$$

3. Al³⁺ and Ca²⁺ have highly negative reduction potentials, so they are not reduced by H₂.

4. Hence, only Cu²⁺ and Pd²⁺ are reduced.

Correct Answer: (A) and (B)