When potassium dichromate crystals are heated with conc. $H_{2} S O_{4}$ , we get

oxygen

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Hydrogen

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Sulphur Dioxide

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Hydrogen sulphide

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Solution

The correct option is A oxygen
$2 K_{2} C r_{2} O_{7} + 8 H_{2} S O_{4} \to 2 K_{2} S O_{4} + 2 C r_{2} (S O_{4})_{3} + 8 H_{2} O + 3 O_{2}$

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