1 g of solid sodium chloride is taken in a clean and dry test tube and 2 mL of conc. Suphuric acid is added to it . If the gas evolved is tested first with dry and then with wet blue litmus paper, in which case will the litmus paper change colour? Give reason for your answer. what inference can be drawn about the nature of the evolved gas ? Support your answer with a chemical equation for the reaction.

Explanation

To solve the problem step by step, we will analyze the reaction between sodium chloride (NaCl) and concentrated sulfuric acid (H₂SO₄), the gas evolved, and the behavior of blue litmus paper when exposed to this gas.

### Step 1: Identify the Reaction
When solid sodium chloride (NaCl) is treated with concentrated sulfuric acid (H₂SO₄), a chemical reaction occurs. The balanced chemical equation for this reaction is:

\[ \text{2 NaCl (s) + H₂SO₄ (l) → Na₂SO₄ (s) + 2 HCl (g)} \]

### Step 2: Identify the Gas Evolved
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