Question

clasiffy the following day to day changes on the basis of physical contact,solution of reactants,heat,light,electricityand catalyst.
(i) Burning of crackers
(ii)Addition of water to quicklime to make it slaked lime
(iii)Silver ornaments become black on exposure to air for a long time (iv)Copper vessel kept on open air for a long time

Answer 1

Answer:

(a) physical contact-- 3

(b) solution of reactants---- 2

(c) heat---- 1

(d)light----- 4

Explanation:

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Answer 2

Answer:(a) physical contact-- 3

(b) solution of reactants---- 2

(c) heat---- 1

(d)light----- 4

Explanation:

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Explanation: