Write balanced chemical equations for the following:

NaCl is heated with sulphuric acid in the presence of $M n O_{2}$ .

Chlorine gas is passed into a solution of Nal in water.

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Solution

(i) $N a C l + H_{2} S O_{4} \to N a H S O_{4} + H C l \times 4$ ....(i)

$4 H C l + M n O_{2} \to M n C l_{2} + C l_{2} + 2 H_{2} O$ ....(ii)

Overall reaction :

$¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ 4 N a C l + M n O_{2} + 4 H_{2} S O_{4} \to M n C l_{2} + 4 N a H S O_{4} + C l_{2} + 2 H_{2} O - ----------------------------------------------- -$

(ii) $C l_{2} + 2 N a I \to 2 N a C l + I_{2}$

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(a) Aluminium hydroxide reacts with sulphuric acid to form aluminium sulphate and water. Write a balanced equation for this reaction.

(b) Balance the following chemical equation.

$M n O_{2}$ + HCl $⟶$ $M n C l_{2}$ + $C l_{2}$ + $H_{2} O$

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