Which of the following reagents is used to test the presence of $S O_{2}$ gas?

Acidified potassium manganate

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Alkaline potassium manganate

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Alkaline potassium dichromate

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Acidified potassium dichromate

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Solution

The correct option is D Acidified potassium dichromate
Potassium dichromate paper can be used to test for sulphur, dioxide, as it turns dichromate paper from orange to green.
$K_{2} {C r}_{2} O_{7} (a q) + 3 {S O}_{2} (g) + H_{2} {S O}_{4} (a q) \to {C r}_{2} {({S O}_{4})}_{3} (a q) + K_{2} {S O}_{4} (a q) + H_{2} O (l)$
(orange) (green)

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