Q5 of 18 Page 9

Give reasons for the following :

Washing soda loses its crystalline structure quickly.

Washing soda (Na2CO3 10H2O) has a higher water content than the water vapour present in the atmosphere, therefore, it loses its hydrated part and become powdery. In other words, washing soda is efflorescent in nature.


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4

Answer the following :

Name the products formed when the following oxides are dissolved in water. Write a balanced equation.


a. Sulphur dioxide


b. Potassium oxide


c. Carbon dioxide


d. Calcium oxide

 4

Answer the following :

State the reasons for hardness in water.

 5

Give reasons for the following :

Sodium metal should be stored in kerosene.

 5

Give reasons for the following :

When calcium nitrate crystals are exposed to air, they form a solution.