How many of the following salts impart characteristic colours to the Bunsen flame ?
`NaCl, KCl, CuCl_(2), BaCl_(2), CaCl_(2),SrCl_(2), ZnCl_(2), MgCl_(2),AlCl_(3)`

Explanation

To determine how many of the given salts impart characteristic colors to the Bunsen flame, we will analyze each salt one by one and identify the color it produces when subjected to a flame test.

### Step-by-Step Solution:

1. **NaCl (Sodium Chloride)**:
- When NaCl is heated in a Bunsen flame, it produces a **golden yellow** color.

2. **KCl (Potassium Chloride)**:
- KCl imparts a **lilac** color to the flame.

3. **CuCl₂ (Copper(II) Chloride)**:
- CuCl₂ gives a **blueish-green** color when burned.

4. **BaCl₂ (Barium Chloride)**:
- BaCl₂ produces an **apple green** color in the flame.

5. **CaCl₂ (Calcium Chloride)**:
- CaCl₂ results in a **brick red** color in the flame.

6. **SrCl₂ (Strontium Chloride)**:
- SrCl₂ imparts a **crimson** color to the flame.

7. **ZnCl₂ (Zinc Chloride)**:
- ZnCl₂ does not produce a characteristic color in the flame test; it generally produces a faint bluish-green color that is not distinct.

8. **MgCl₂ (Magnesium Chloride)**:
- MgCl₂ does not impart a characteristic color to the flame; it typically burns with a bright white light.

9. **AlCl₃ (Aluminum Chloride)**:
- AlCl₃ also does not give a characteristic color in the flame test; it usually burns with a white flame.

### Summary:
The salts that impart characteristic colors to the Bunsen flame are:
- NaCl (golden yellow)
- KCl (lilac)
- CuCl₂ (blueish-green)
- BaCl₂ (apple green)
- CaCl₂ (brick red)
- SrCl₂ (crimson)

Thus, the total number of salts that impart characteristic colors is **6**.

### Final Answer:
**6 salts impart characteristic colors to the Bunsen flame.**

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