When sodium chloride is heated with concentrated sulphuric acid, the gas liberated is 

Options

A. Chlorine
B. Sulphur dioxide
C. Hydrogen chloride
D. Sulphur trioxide

Answer

To solve the question regarding the reaction between sodium chloride (NaCl) and concentrated sulfuric acid (H₂SO₄), we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are sodium chloride (NaCl) and concentrated sulfuric acid (H₂SO₄).

### Step 2: Write the Chemical Equation
When sodium chloride is heated with concentrated sulfuric acid, the following reaction occurs:
\[ \text{NaCl} + \text{H}_2\text{SO}_4 \rightarrow \text{NaHSO}_4 + \text{HCl} \]

### Step 3: Identify the Products
From the reaction, we can see that the products formed are sodium bisulfate (NaHSO₄) and hydrogen chloride (HCl).

### Step 4: Determine the Gas Liberated
In this reaction, the gas that is liberated is hydrogen chloride (HCl), which is a colorless gas with a pungent odor.

### Conclusion
When sodium chloride is heated with concentrated sulfuric acid, the gas liberated is hydrogen chloride (HCl).

### Final Answer
The gas liberated is **Hydrogen Chloride (HCl)**.

---