Water of Crystallisation

Q.

Which of the following salts are not hydrated salts?

1. Glauber's salt

2. Blue vitriol

3. Washing soda

4. Baking soda

Q.

Acidified potassium permanganate solution is decolourised by:

1. Bleaching Powder

2. White Vitriol

3. Mohrs Salt

4. Microcosmic salt

Q.

The method that is used to obtain pure salt from a salt solution is

1. Filtration

2. Crystallization

3. Solidification

4. Melting

Q.

The process of obtaining large crystals of pure salt from seawater is known as ______.

1. Crystallisation

2. Galvanisation

3. Condensation

4. Sublimation

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.

Which of the following mixtures can be separated by fractional crystallization?

1. $P+NaN{O}_3$

2. $NaN{O}_3+NaCl$

3. $KN{O}_3+C$

4. $NaCl+S$

Q.

Give one word / words for the following statements :

(a) Water fit for human consumption____________

(b) The harmful substances dissolved in water_______________

(c) The change of states of water from one form to another _____________________

(d) The gaseous form of water found in air _______________

(e) A mixture of common salt and ice _______________

(f) A substance which does not contain water __________________

(g) A property due to which a substance absorbs water without dissolving _______________

(h) Water molecules in loose chemical combination with other substances__________________

Q.

Which of the following formula and colour is/are correct for hydrated salts:-

1. Green vitriol - $FeS{O}_4.5H_{2}O$

   Colour:- Green

2. White vitriol - $ZnS{O}_4.7H_{2}O$

   Colour:- White

3. Red Vitriol:- $CoS{O}_4.7H_{2}O$, Red

   Colour: - Red

4. Blue vitriol :- $CuS{O}_4.5H_{2}O$

   Colour:- Blue

Q.

A substance that doesn't contain water is called___ .substance

Q.

Solid particles of copper sulphate are prepared by the method of:

1. Fractional distillation

2. Crystallisation

3. Solidification

4. Distillation

Q. Anhydrous cobalt chloride is used for detecting water leakages because it turns
from on hydration.​

1. blue; white​
2. blue; pink​
3. pink; blue​
4. pink; white​

Q.

How will you separate the crystals of copper sulphate which you have prepared in the laboratory?

Q. How phitkari helps in water clear

Q. A student is performing an experiment where a blue salt is being heated to dryness in order to determine the percent of water in the salt. Which pieces of laboratory equipment would be used to help determine this percentage?
i. A crucible and cover
ii. Tongs
iii. A triple beam balance

1. ii and iii only
2. iii only
3. i. ii and iii
4. ii only
5. i and iii only

Q. When ${\text{CuSO}}_4.5{\text{H}}_2\text{O}$ is heated, the products formed are:

1. ${\text{CuSO}}_4.10{\text{H}}_2\text{O}\text{and}5{\text{H}}_2\text{O}$
2. ${\text{CuSO}}_4.3{\text{H}}_2\text{O}$ and ${\text{CO}}_2$
3. ${\text{Cu(OH)}}_2\text{and}{\text{H}}_2{\text{SO}}_4$
4. ${\text{CuSO}}_4\text{and}5{\text{H}}_2\text{O}$

Q.

When a hot, saturated solution of two substances ‘ ’X and Y at 80$°$C is cooled slowly, X first crystallizes and settles down at 30$°$C, whereas Y remains in the solution. Identify the true statement which complies with the above experimental result.

1. X is more soluble than Y at 80$°$C.

2. X is more soluble than Y at 30$°$C.

3. Solubility of Y at 30$°$C is more than that of X.

4. Solubility of Y is more than that of X from 80$°$C to 30$°$C.

Q. Sodium carbonate is known by the common name of .

1. washing soda
2. baking soda
3. caustic soda