Classify the following day to day activities based on chemical reactio

1.	Classify the following day to day activities based on chemical reactions by physical contact, solutions of reactants, heat, light,electricity and catalyst.1. Burning of crackers during festivals 2. Addition of water to quicklime to make it slaked lime 3. Silver ornaments become black on exposure to air for a longtime 4. Copper vessel kept in open air for long time
Answer» 1. Chemical reaction. 2. Exothermic reaction. 3. Tarnishing. 4. Rusting.

Classify the following day to day activities based on chemical reactions by physical contact, solutions of reactants, heat, light,electricity and catalyst.1. Burning of crackers during festivals 2. Addition of water to quicklime to make it slaked lime 3. Silver ornaments become black on exposure to air for a longtime 4. Copper vessel kept in open air for long time

Answer»

1. Chemical reaction.

2. Exothermic reaction.

3. Tarnishing.

4. Rusting.