Colloidal Sulphur is obtained when

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Sulphur is heated in absence of air

sodium thiosulphate is treated with iodine

Sulphur is heated in presence of air

$H_{2} S$ is passed through water containing ${HNO}_{3}$ .

answer is D.

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Detailed Solution

When $H_{2} S$ is run over nitric acid, it oxidises $S 2$ to Colloidal Sulphur $S 0$ and amorphous sulphur is created. Nitric acid acts as an oxidising agent.

$H_{2} S + 2 {HNO}_{3} \to S + 2 {NO}_{2} + H_{2} O$

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