When `H_(2)S` gas a passed through an ammonical salt solution X, a slightly white precipitate is formed. The X can be:

Options

A. Cobalt salt
B. Nickel salt
C. Manganese salt
D. Zinc salt

Answer

To solve the question, we need to identify the ammoniacal salt solution \( X \) that forms a slightly white precipitate when hydrogen sulfide (\( H_2S \)) gas is passed through it. Let's analyze the options step by step.

### Step 1: Understand the Reaction
When \( H_2S \) gas is passed through an ammoniacal solution of a metal salt, it can form metal sulfides. The color of the precipitate formed is crucial for identifying the salt.

### Step 2: Identify the Group 4 Cations
The group 4 cations that can form precipitates with \( H_2S \) in an ammoniacal solution include:
- Cobalt (\( Co^{2+} \))
- Nickel (\( Ni^{2+} \))
- Manganese (\( Mn^{2+} \))
- Zinc (\( Zn^{2+} \))

### Step 3: Analyze the Precipitate Colors
- **Cobalt Sulfide (\( CoS \))**: Forms a black precipitate.
- **Nickel Sulfide (\( NiS \))**: Forms a greenish-black precipitate.
- **Manganese Sulfide (\( MnS \))**: Forms a light pink or gray precipitate.
- **Zinc Sulfide (\( ZnS \))**: Forms a white precipitate.

### Step 4: Conclusion
Since the question specifies that a slightly white precipitate is formed, we can conclude that the only salt among the options that fits this description is zinc salt, which forms \( ZnS \) as a white precipitate.

### Final Answer
The ammoniacal salt solution \( X \) is **Zinc salt**.

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