$S O_{2}$ turns acidified $K_{2} C r_{2} O_{7}$ ________.

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Solution

The correct option is A green
Sulphur dioxide is one of the few common acidic yet reducing gases. It turns moist litmus pink being acidic and then white due to its bleaching effect. It may be identified by bubbling it through a dichromate solution turning the solution from orange to green ${C r}^{3 +}$ .

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S O_{2}

K_{2} C r_{2} O_{7}

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S O_{2}

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