Crystals of Salts

Q.

Which method is used to separate sugar and water from its solution?

1. Chromatography
2. Centrifugation
3. Distillation
4. Separating funnel

Q.

Explain the following terms.

Crystallization

Q. In one of the industrial processes for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in chemical industry. Identify X and Y giving the chemical equation of the reactions involved.

Q.

When $CuS{O}_4.5H_{2}O$ is heated the products are:

1. CuSO₄. 3H₂O and CO₂

2. CuSO₄.10H₂O and 5H₂O

3. CuSO₄ and 5H₂O

4. None of these

Q.

Define crystallization

Q. When copper sulphate crystals are mixed in water, they ___________.

1. disappears
2. make the solution colourless
3. started floating
4. none of the above

Q. What is the chemical formula of Gypsum?

1. ${CaSO}_4$$.$${5H}_{2}O$
2. ${CaSO}_4$$.$${7H}_{2}O$
3. ${CaSO}_4$$.$${2H}_{2}O$
4. ${CaSO}_4$$.$${9H}_{2}O$