Question

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. Fading of coloured clothes on drying under sunlight.
3. Cooking of eggs.
4. Charging of batteries.

Answer 1

1. Chemical reaction.
2. Exothermic reaction.
3. Tarnishing.
4. Rusting.