An aqueous solution containing one mole of ${H g I}_{2}$ and two moles of $N a I$ is orange on colour. On addition of excess $N a I$ , the solution becomes colourless. The orange colour reappears on the subsequent addition of $N a O C l$ .

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Solution

An aqueous solution containing one mole of ${H g I}_{2}$ and two moles of $N a I$ is orange on colour as $H g l_{2}$ is an orange coloured compound. On addition of excess $N a I$ the solution becomes colourless as $H g l_{2}$ is consumed in the reaction.
$2 N a l + H g l_{2} o r a n g e ⟶ N a_{2} H g l_{4} c o l o u r l e s s$
The orange colour reappears on subsequent addition of $N a O C l$ as $H g l_{2}$ is regerated.
$N a_{2} H g l_{4} + N a O C l + H_{2} O ⟶ 2 N a O H + N a C l + H g l_{2} + I_{2}$

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