GIVE REASONS FOR THE FOLLOWING
a. SODIUM CHLORIDE DISSOLVES N WATER
b.NAPTHALENE AND ANTHRACENE DON'T DISSOLVE IN WATER BUT READILY DISSOLVE IN BENZENE

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Solution

The process of dissolution follows the principle, like dissolves like.
Sodium chloride is ionic in nature and is composed of charged ions, sodium cations and chloride anions. Water is composed of hydronium cation and hydroxyl anion,
Napthalene, anthracene and benzene all are non-polar.

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Give reasons for the following :

(a) Sodium hydrogen sulphate is not an acid but it dissolves in water to give hydrogen ions, according to the equation

$N a H S O_{4} ⇌ H^{+} + N a^{+} S O_{4}^{2 -}$

(b) Anhydrous calcium chloride is used in a desiccator.

20^{0} C

80^{0} C

H N O_{3}

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