Borax is converted into amorphous Boron by following steps
`"Borax"overset(X)toH_(3)BO_(3)overset(triangle)toB_(2)O_(3)underset(triangle)overset(Y)toB`
X and Y are respectively

Options

A. `HCl,Mg`
B. `HCl,C`
C. `C,Al`
D. `HCl,Al`

Explanation

To convert borax into amorphous boron, we follow a series of chemical reactions. Let's break down the steps:

### Step 1: Conversion of Borax to Boric Acid
- **Starting Material**: Borax (Na₂B₄O₇·10H₂O)
- **Reaction**: When borax is heated in the presence of concentrated hydrochloric acid (HCl), it produces boric acid (H₃BO₃).

**Chemical Equation**:
\[ \text{Na}_2\text{B}_4\text{O}_7 \cdot 10\text{H}_2\text{O} + \text{HCl} \rightarrow \text{H}_3\text{BO}_3 + \text{NaCl} + \text{H}_2\text{O} \]

- **Identifying X**: Here, X is concentrated hydrochloric acid (HCl).

### Step 2: Conversion of Boric Acid to Boric Anhydride
- **Starting Material**: Boric acid (H₃BO₃)
- **Reaction**: When boric acid is heated, it loses water and forms boric anhydride (B₂O₃).

**Chemical Equation**:
\[ 2\text{H}_3\text{BO}_3 \xrightarrow{\Delta} \text{B}_2\text{O}_3 + 3\text{H}_2\text{O} \]

### Step 3: Conversion of Boric Anhydride to Amorphous Boron
- **Starting Material**: Boric anhydride (B₂O₃)
- **Reaction**: When boric anhydride is heated in the presence of aluminum (Al), it reduces to form amorphous boron.

**Chemical Equation**:
\[ \text{B}_2\text{O}_3 + 6\text{Al} \xrightarrow{\Delta} 2\text{B} + 3\text{Al}_2\text{O}_3 \]

- **Identifying Y**: Here, Y is aluminum (Al).

### Summary of Identifications
- **X**: Concentrated hydrochloric acid (HCl)
- **Y**: Aluminum (Al)

Thus, the final answer is:
- **X = HCl**
- **Y = Al**