Hydrogen chloride is conveniently made in the laboratory by treating `"_____"` with concentrated sulphuric acid

Options

A. `NaCl`
B. `NH_(4)Cl`
C. Both (1)and(2)
D. `CaCl_(2)`

Explanation

To answer the question about how hydrogen chloride (HCl) is conveniently made in the laboratory using concentrated sulfuric acid, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**: We need to determine which compound can react with concentrated sulfuric acid to produce hydrogen chloride. The common laboratory method involves using sodium chloride (NaCl).

2. **Write the Reaction**: The reaction between sodium chloride and concentrated sulfuric acid can be represented as follows:
\[ \text{NaCl (s) + H}_2\text{SO}_4 \text{(l)} \rightarrow \text{HCl (g) + NaHSO}_4 \text{(s)} \]
In this reaction, solid sodium chloride reacts with liquid concentrated sulfuric acid to produce gaseous hydrogen chloride and solid sodium hydrogen sulfate (NaHSO₄).

3. **Understand the Products**: The main product of interest here is hydrogen chloride (HCl), which is generated as a gas during the reaction.

4. **Conclusion**: Therefore, the compound that is treated with concentrated sulfuric acid to produce hydrogen chloride is sodium chloride (NaCl).

### Final Answer:
Hydrogen chloride is conveniently made in the laboratory by treating **sodium chloride (NaCl)** with concentrated sulfuric acid.