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Kinetic Theory of Gases

How many mole...

Question

How many moles of $H_{2} O_{2}$ is oxidised by $0.5$ mol $K_{2} C r_{2} O_{7}$ in acidic medium?

2

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3

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1.5

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6

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Solution

The correct option is C $1.5$
Reaction of $H_{2} O_{2}$ with $K_{2} C r_{2} O_{7}$ is as follows:
$K_{2} C r_{2} O_{7} + 3 H_{2} O_{2} + 4 H_{2} S O_{4} \to C r_{2} (S O_{4})_{3} + K_{2} S O_{4} + 7 H_{2} O + 3 O_{2}$
Since, $1$ mole of $K_{2} C r_{2} O_{7}$ reacts with 3 moles of $H_{2} O_{2}$ .
Therefore, $0.5$ mole of $K_{2} C r_{2} O_{7}$ reacts with $1.5$ moles of $H_{2} O_{2}$ .

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