Question

example of chemical reaction showing evolution of gas and change in substance colour during a chemical reaction

Answer 1

Example of chemical reaction showing evolution of gas

1. Zn + HCl→ZnCl2+H2

2.Na + HCl→NaVl2 + H2

Example of chemical reaction showing change in colour

1. Fe + CuSO4 →FeSO4+Cu

Blue color turns to green color solution

2. AgNO3+ Cu →Cu(AgNO3)2+Ag

Colourless solution turns blue in colour