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Classify the following day to day activities based on chemical reactions by physical contact, solutions of reactants, heat, light, electricity and catalyst.

a). Burning of crackers during festivals
b). Fading of coloured clothes on drying under sunlight.
c). Cooking of eggs.
d). Charging of batteries.
 
a. Burning of crackers during festivals is classified as a .

b. Fading of coloured clothes on drying under sunlight is classified as .

c. Cooking of eggs is classified as a .

d. Charging of batteries is classified as a .