Statement-1 :`Cu^(2+)` and `Cd^(2+)` ions form complexes with excess of potassium cyanide solution.
Statement-2 : On passing `H_(2)S` gas, complex `[Cu(CN)_(4)]^(3-)` is not effected but `[Cd(CN)_(4)]^(2-)` gives yellow precipitated.

Options

A. STATEMENT-1 is true, STATEMENT-2 is true and STATEMENT-2 is correct explanation for STATEMENT-1
B. STATEMENT-1 is true, STATEMENT-2 is true and STATEMENT-2 is not correct explanation for STATEMENT-2
C. STATEMENT-1 is true, STATEMENT-2 is false
D. STATEMENT-1 is false, STATEMENT-2 is true

Explanation

To analyze the statements regarding the behavior of `Cu^(2+)` and `Cd^(2+)` ions in the presence of potassium cyanide (KCN) and hydrogen sulfide (H₂S), we can break down the solution into clear steps.

### Step-by-Step Solution:

**Step 1: Formation of Complexes with KCN**
- When `Cu^(2+)` and `Cd^(2+)` ions are treated with excess potassium cyanide (KCN), they form complexes:
- For `Cu^(2+)`:
\[ Cu^{2+} + 4CN^- \rightarrow [Cu(CN)_4]^{3-} \]
- For `Cd^(2+)`:
\[ Cd^{2+} + 4CN^- \rightarrow [Cd(CN)_4]^{2-} \]
- Both ions indeed form complexes with KCN, confirming that Statement-1 is correct.

**Step 2: Reaction with H₂S**
- When hydrogen sulfide (H₂S) gas is passed through the complexes:
- The complex `[Cu(CN)₄]^{3-}` is stable and does not react with H₂S. Therefore, it remains unchanged.
- The complex `[Cd(CN)₄]^{2-}` is less stable and reacts with H₂S to form cadmium sulfide (CdS), which is a yellow precipitate:
\[ [Cd(CN)_4]^{2-} + H_2S \rightarrow CdS \downarrow (yellow \, precipitate) \]
- This indicates that Statement-2 is also correct, as it describes the behavior of the cadmium complex in the presence of H₂S.

**Step 3: Evaluating the Explanation**
- While both statements are correct, Statement-2 does not serve as a correct explanation for Statement-1. Statement-1 simply states that both ions form complexes with KCN, while Statement-2 discusses the stability of these complexes in the presence of H₂S, which is a separate observation.

### Conclusion:
- **Statement-1**: True (Both `Cu^(2+)` and `Cd^(2+)` form complexes with KCN).
- **Statement-2**: True (The behavior of complexes with H₂S is correctly described).
- **Explanation Validity**: Statement-2 is not a correct explanation for Statement-1.

### Final Answer:
- Both statements are true, but Statement-2 is not a correct explanation of Statement-1.

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