Question

how can we classify a change on the basis of reaction ​

Answer 1

Answer:

Chemical reactions may be classified as an acid–base reaction, an exchange reaction, a condensation reaction and its reverse, a cleavage reaction, and an oxidation–reduction (or redox) reaction. To keep track of electrons in chemical reactions, oxidation states are assigned to atoms in compounds.

Explanation:

Answer 2

Answer:

1.

change in colour

2.

change in temperature

3.

change in state

4.

evolution of gas

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