Which of the following salt has a blue colour and why? CuSO 4 .5H 2 O or CuSO 4

Q4 of 270 Page 96

Which of the following salt has a blue colour and why?
CuSO₄.5H₂O or CuSO₄

CuSO₄.5H₂O/ copper sulphate. It is an hydrated salt as it contains water molecules which imparts blue colour to it.

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

(ii) sodium carbonate decahydrate.

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.

What would be the colour of litmus in a solution of sodium carbonate?

State the common and chemical names of the compound formed when plaster of Paris is mixed with water.