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How many moles of potassium chlorate to be heated to produce 11.2 litre oxygen -

(1) 1/2 mol

(2) 1/3 mol

(3) 1/4 mol

(4) 2/3 mol

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Correct Answer is: (2) 1/3 mol

∵ 3 × 22.4 litre O2 is formed by 2 mol KClO3

∴ 11.2 litre O2 is formed by (2 x 11.2) / (3 x 22.4) = 1/3 mol KClO3

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