A solution of a compound X in dilute HCl on treatment with a solution of `BaCl_(2)` gives a white precipitate of compound Y which is insoluble in conc. `HNO_(3)` and and conc. `HCl`. Compound X imparts golden yellow colour to the flame.
`underset(("immparts golden yellow colour"))(X("Solution in dilute HCl"))+BaCl_(2) to underset("White")(Y)underset("Conc. HCl")overset("Conc. "HNO_(3))to`Insoluble
What are compounds X and Y?

Options

A. X is `MgCl_(2)` and Y is `BaSO_(4)`
B. X is `CaCl_(2) and Y` is `BaSO_(4)`
C. X is `Na_(2)SO_(4)` and Y is `BaSO_(4)`
D. X is `MgSO_(4)` and Y is `BaSO_(4)`

Explanation

To solve the problem, we need to identify the compounds X and Y based on the information provided.

### Step-by-Step Solution:

1. **Identify Compound X**:
- The problem states that compound X imparts a golden yellow color to the flame.
- In flame tests, sodium salts (like sodium sulfate, Na₂SO₄) are known to impart a bright yellow color to the flame.
- Other common s-block elements such as magnesium and calcium do not impart a golden yellow color (magnesium gives no color, and calcium gives a brick red color).
- Therefore, we can conclude that compound X is likely sodium sulfate (Na₂SO₄).

2. **Reaction with BaCl₂**:
- The next part of the problem states that when compound X (sodium sulfate) is treated with barium chloride (BaCl₂), it forms a white precipitate, which we will call compound Y.
- The reaction can be written as:
\[ \text{Na}_2\text{SO}_4 + \text{BaCl}_2 \rightarrow \text{BaSO}_4 \downarrow + 2\text{NaCl} \]
- Here, barium sulfate (BaSO₄) is the white precipitate formed, which is compound Y.

3. **Insolubility of Compound Y**:
- The problem also states that compound Y (barium sulfate) is insoluble in concentrated HNO₃ and concentrated HCl.
- This is consistent with the known properties of barium sulfate, which is indeed insoluble in these acids.

### Conclusion:
- Therefore, we can conclude that:
- Compound X is sodium sulfate (Na₂SO₄).
- Compound Y is barium sulfate (BaSO₄).

### Final Answer:
- Compound X: Sodium sulfate (Na₂SO₄)
- Compound Y: Barium sulfate (BaSO₄)

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