Which of the following chemical contains chlorine

Options

A. Fischer salt
B. Epsom salt
C. Fremy's salt
D. Spirit of salt

Answer

To determine which of the given chemicals contains chlorine, we will analyze the chemical formulas of each option provided.

### Step 1: Identify the chemicals and their formulas.
- **Fisher Salt**: Potassium cobalt nitrate, which has the formula \( K_3[Co(NO_2)_6] \).
- **Epsom Salt**: Magnesium sulfate heptahydrate, which has the formula \( MgSO_4 \cdot 7H_2O \).
- **Fremi Salt**: Potassium sodium tartrate, which has the formula \( K_2Na(SO_3) \cdot 2H_2O \).
- **Spirit of Salt**: Hydrochloric acid, which has the formula \( HCl \).

### Step 2: Check each chemical for the presence of chlorine.
- **Fisher Salt**: The formula \( K_3[Co(NO_2)_6] \) does not contain chlorine.
- **Epsom Salt**: The formula \( MgSO_4 \cdot 7H_2O \) does not contain chlorine.
- **Fremi Salt**: The formula \( K_2Na(SO_3) \cdot 2H_2O \) does not contain chlorine.
- **Spirit of Salt**: The formula \( HCl \) contains chlorine.

### Step 3: Conclusion
Among the given options, only **Spirit of Salt (HCl)** contains chlorine. Therefore, the correct answer is:

**Option 4: Spirit of Salt contains chlorine.**

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