Chemistry, asked by jhanavijhanavi081, 8 hours ago

give one example of each:(a) chemical reaction showing evolution of gas. (b) change in substances colour during a chemical reaction.

Answers

Answered by shubham4649

2

Answer:

Hcl + Na ------in aqueous----- Nacl2 + H2 |

Ca(OH)2 + co2 --------CaCo3 +H2O

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