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Fluorides of Xenon

1 mole of X...

Question

1 mole of $X e F_{4}$ on reaction with excess of $K I$ will liberate $I_{2}$ that requires _________.

1 mole of

N a_{2} S_{2} O_{3}

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2 moles of

N a_{2} S_{2} O_{3}

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0.5 mole of

N a_{2} S_{2} O_{3}

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4 moles of

N a_{2} S_{2} O_{3}

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Solution

The correct option is B 4 moles of $N a_{2} S_{2} O_{3}$
$X e F_{4} + 4 K I ⟶ X e + 2 I_{2} + 4 K F$

In the above reaction, two moles of iodine liberates and every mole of iodine requires two moles of hypo solution. So the total solution required is 4 moles.
Reaction:
$2 N a_{2} S_{2} O_{3} + I_{2} \to N a_{2} S_{4} O_{6} + 2 N a I$

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