1. Write the chemical formula of the following compounds :
1. Potassium Nitrate
2. Sodium Carbonate
3. Barium Sulphate
4. Lead Nitrate
5. Potassium Iodide
6. Barium Chloride
7. Ammonium Chloride
8. Calcium Oxide
9. Hydrogen Sulphide
10.Aluminium
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