Question

what types of changes are observed during chemical reactions?​

Answer 1

1) Change in physical state of the substance. ( 2) Change in colour observed in the substance. (3) Evolution of a gas appears during the reaction. ( 4) Change in temperature of the reaction mixture during the reaction.

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Answer 2

Answer:

(1) Change in physical state of the substance.

(2) Change in colour observed in the substance.

(3) Evolution of a gas appears during the reaction.

(4) Change in temperature of the reaction mixture during the reaction.

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