Write the chemical formula of (i) soda ash, and

(ii) sodium carbonate decahydrate.

(a) Name X and Y

(b) Write the chemical equation of the reaction of metal X with

(i) hydrochloric acid, and

(ii) sodium hydroxide solution.

What is the chemical formula of

(a) baking soda, and

(b) washing soda?

State whether the following statement is true or false:

Copper sulphate crystals are always wet due to the presence of water of crystallization in them.

Which of the following salt has a blue colour and why?

CuSO₄.5H₂O or CuSO₄