Identify the salts W, X, Y and Z from their uses.
W: Usedin medicines and fire extinguishers
X : Used in purification of water
Y: Used in fireworks
Z: Used as a fungicide

Options

A. W- Sodium carbonate , X-Potash alum , Y-Copper sulphate , Z-Sodium nitrate
B. W-Potassium chloride , X-Silver nitrate , Y-Sodium bicarbonate , Z-Potassium sulphate
C. W-Potassium nitrate , X-Sodium carbonate , Y-Potash alum , Z-Sodium chloride
D. W-Sodium bicarbonate , X-Potash alum , Y-Potassium nitrate , Z-Copper sulphate

Explanation

To identify the salts W, X, Y, and Z based on their uses, we can analyze each use and match it with the appropriate salt.

### Step-by-Step Solution:

1. **Identify Salt W**:
- **Use**: W is used in medicines and fire extinguishers.
- **Analysis**: One common salt that is used in both medicines and fire extinguishers is **Sodium Bicarbonate (NaHCO₃)**, also known as baking soda. It is used in antacids and can also be found in some fire extinguishers.

**Conclusion**: W = Sodium Bicarbonate (NaHCO₃)

2. **Identify Salt X**:
- **Use**: X is used in the purification of water.
- **Analysis**: A common salt used for water purification is **Alum (Potassium Aluminum Sulfate, KAl(SO₄)₂·12H₂O)**. It is widely used in water treatment processes to clarify water.

**Conclusion**: X = Alum (KAl(SO₄)₂·12H₂O)

3. **Identify Salt Y**:
- **Use**: Y is used in fireworks.
- **Analysis**: A common salt used in fireworks is **Potassium Nitrate (KNO₃)**. It serves as an oxidizer in fireworks, helping to create the desired effects.

**Conclusion**: Y = Potassium Nitrate (KNO₃)

4. **Identify Salt Z**:
- **Use**: Z is used as a fungicide.
- **Analysis**: A well-known salt used as a fungicide is **Copper Sulfate (CuSO₄)**. It is often used in agriculture to control fungal diseases in plants.

**Conclusion**: Z = Copper Sulfate (CuSO₄)

### Final Summary:
- W = Sodium Bicarbonate (NaHCO₃)
- X = Alum (KAl(SO₄)₂·12H₂O)
- Y = Potassium Nitrate (KNO₃)
- Z = Copper Sulfate (CuSO₄)