Calcium oxide Food a) Burni b) Fadin under c) Cooki d) Charg VIII. Valy V. Answer briefly. 1. Define a chemical reaction. 2. Mention the various conditions required for a chemical reaction to occur. 3. Define catalysis. 4. What happens when an iron nail is placed in copper sulphate solution? 5. What is pollution 6. What is tarnishing? Give an example. 7. What happens to the brine during electrolysis? 8. On heating, calcium carbonate gives calcium oxide and oxygen. Is it an exothermic reaction or an endothermic reaction? 1. Kumar i purchase construc shop ned iron rods showed brownist
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