Question

Give one example each of a chemical reaction showing the following characteristics evoliutioon of gas

Answer 1

Answer:

Evolution of gas:

The chemical reaction between zinc and dilute sulphuric acid is characterized by the evolution of hydrogen gas.

Zn(s)+H2​SO4(aq)→ZnSO4​(aq)+H2​(g)

Answer 2

Answer:

Decomposition reaction :- A-B+C

Displacement reaction :- Fe(s) +CUSO4 - FeSO4+Cu

Double displacement reaction:- 2KBr+Pb(NO3)2-+Pbl+2KNo

Endothermic reaction:- It require energy in the form of heat,light, or electricity to break reactants.