Solid solutions are called :

1. Allotropes
2. Isotopes
3. Alloys
4. Isotones

With a rise in temperature, the solubility of sodium chloride will:

1. Increase rapidly
2. Decrease
3. Remain the same
4. Increase slightly

The crystalline substance that does not contain water of crystallization is:

1. Plaster of paris
2. Potash alum
3. Potassium permanganate
4. Epsom salt

Table salt becomes sticky in the presence of moisture because :

1. It is deliquescent
2. It is hygroscopic
3. It contains impurities which are deliquescent
4. It is a good drying agent.