Water of Crystallisation

Q.

Question 04.
Which of the following salts does not contain water of crystallization?
(a) Blue vitriol
(b) Baking soda
(c) Washing soda
(d) Gypsum

Q. Which of the following salts does not contain water of crystallisation?

1. Baking soda
2. Blue vitriol
3. Washing soda
4. Gypsum

Q.

What are the chemical name and chemical formulas of alum?

Q.

Thomas slag is

1. ${\mathrm{CaSiO}}_3$

2. ${\mathrm{Ca}}_4{\left({\mathrm{PO}}_4\right)}_2\mathrm{O}$

3. ${\mathrm{CaCO}}_3$

4. ${\mathrm{MnSiO}}_3$

Q.

What would you observe, when the water of crystallization of a salt is removed by heating it?

Q.

When we put Cuso4 in water after some time we find the solution turns blue . why? Also on heating it what change will occur?

Q.

Write the name and chemical formula of two such compounds whose one formula unit is associated with 10 and 2 water molecules respectively.

Q.

Assertion: Green vitriol is hydrated ferrous sulfate.

Reason: Chemical formula of green vitriol is ${\mathrm{FeSO}}_4.7{\mathrm{H}}_2\mathrm{O}$

1. Both assertion and reason are correct and the reason is the correct explanation of the assertion.

2. Both assertion and reason are correct but the reason is not the correct explanation of the assertion.

3. The assertion is correct but the reason is incorrect

4. The assertion is incorrect but the reason is correct

Q. What happens to the color of crystallized copper sulphate on reacting with sulphuric acid?

1. Orange
2. White
3. Colorless
4. Green

Q.

Which of the following salts are not hydrated salts?

1. Glauber's salt

2. Washing soda

3. Baking soda

4. Blue vitriol

Q. The colour of the salt formed due to the removal of water crystals from hydrated copper sulphate upon heating is _________.

1. orange
2. white
3. red
4. green

Q.

Find the number of phosphine molecules formed when 5 molecules of $C{a}_3{P}_2$reacts with water. Slaked lime is another product.

Q. Aman was heating blue vitriol in a testtube and after a while it became white coloured amorphous substance. Give reason.
[2 Marks]