Assertion : $X e F_{4}$ may be estimated by titrating the $I_{2}$ by reaction with $K I$ . Reason: Equivalent weight of $N a_{2} S_{2} O_{3}$ can be determined by iodimetric titration.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is true but Reason is false

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Assertion is false but Reason is true

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
$X e F_{4} + 4 K I ⟶ X e + 2 I_{2} + 4 K F$

In this reaction two moles of iodine liberates and every mole of iodine requires two moles of hypo solution so total solution required is 4 moles.
Reaction:
$2 N a_{2} S_{2} O_{3} + I_{2} \to N a_{2} S_{4} O_{6} + 2 N a I$
So by titrating iodine we can estimate amount of $X e F_{4}$ .

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Assertion :XeF4 may be estimated by titrating the I2 by reaction with KI. Reason: Equivalent weight of Na2S2O3 can be determined by iodimetric titration.

Assertion : $X e F_{4}$ may be estimated by titrating the $I_{2}$ by reaction with $K I$ . Reason: Equivalent weight of $N a_{2} S_{2} O_{3}$ can be determined by iodimetric titration.