Permanent Hardness

Q.

Molecular formula of Green Vitriol is?

Q.

On heating anhydrous $N{a}_{2}C{O}_3$, ___ is evolved

1. No gas

2. Water vapour

3. CO₂

4. CO

Q.

What is the chemical formula for blue vitriol, whose systematic name is copper(II) sulfate?

Q.

16. Chemical formula of white lead is ________.

Q. What is the chemical formula of natrolite?

1. ${\text{Na}}_2{\text{Al}}_3{\text{Cl}}_3{\text{O}}_{10}.2{\text{H}}_2\text{O}$
2. ${\text{Na}}_2{\text{Al}}_2{\text{Si}}_3{\text{O}}_{10}.2{\text{H}}_2\text{O}$
3. ${\text{Mg}}_2{\text{Al}}_2{\text{Si}}_3{\text{O}}_4.10{\text{H}}_2\text{O}$
4. ${\text{Na}}_2{\text{Al}}_2{\text{Cl}}_3{\text{O}}_4.10{\text{H}}_2\text{O}$

Q. The chemical formula of washing soda is

1. ${\text{Na}}_2{\text{CO}}_3$
2. $\text{NaCl}$
3. ${\text{NaNO}}_3$
4. ${\text{NaHCO}}_3$

Q.

Give the names of the elements present in the following compounds :

(a) Quick lime (b) Hydrogen bromide (c) Baking powder (d) Potassium sulphate

Q. Solid $C{O}_2$ is used as a refrigerant.

1. True
2. False

Q.

Blue vitriol is

1. sodium bicarbonate

2. ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$

3. copper sulphate

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