Q5 of 18 Page 9

Give reasons for the following :

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

Calcium Nitrate is a deliquescent substance. Calcium nitrate absorbs moisture from the atmosphere and dissolves in it to make a solution. The vapour pressure of the calcium nitrate solution that is formed is less than the partial pressure of water vapour in the air. All soluble salts will deliquesce if the air is sufficiently humid.


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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

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State the reasons for hardness in water.

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Sodium metal should be stored in kerosene.

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Give reasons for the following :

Washing soda loses its crystalline structure quickly.