Question

18. Read the following and answerany four questions:
Copper sulphate crystal contains water of crystallization when the crystal is heated the
water is removed and salt turns white. The crystal can be moistened again with water.
The water of crystallization is the fixed number of watermolecule present in 1 formula
unit of copper sulphate. On heating gypsum at 3731K, it loses water molecule and became
calcium sulphate hemihydrate.
Test tube holder
Water droplets
Copper suplate cysts
Burner
d. pink
i. If the crystal is moistened with water
a. Blue
b. green
c. black
ii. Whatis the commercial name of calcium sulphate hemihydrate?
2. Washing soda b. Bleaching powder c. Plaster of Paris d. Baking soda
water molecules are present in one formula unit of copper sulphate
Five
b. Twoc. Six d. Seven
iv. The calcium sulphate hemihydrate is prepared by heating one of the following to a
temperature of 100C. This is
a CaCO3.12 H2O
b. CaCl2.12 H2O c. CaSO3.2 H20 d. CaSO4.12 H20
V. Thesalt
which possesses water of crystalline solution is
a. baking soda b. gypsum c. washing soda d. bleaching powde​

Answer 1

Answer:

1 blue

2. washing soda

3. two

4.caso3.2 H2O

5. gypsum