Acids, Bases and Salts Class X Important Questions and Answers

1.What is efflorescence? Give an example?
Ans. It in the process of the loss of molecules of water of crystallization from a substance when exposed to air for example

Chemical Reactions and Equations CLASS X Important questions

Q1. Why does not silver evolve hydrogen on reacting with dil H2SO4
Ans.Silver do not evolve hydrogen on reacting with dil.H2SO4 as silver is less reactive metal than hydrogen