Assertion : $I_{3}^{-}$ reacts with $H_{3} A s O_{3}$ as $H_{3} A s O_{3} + K I_{3} + H_{2} O ⟶ H_{3} A s O_{4} + K I + 2 H I$ . Reason: Equivalent mass of $K I_{3} = 210$ .

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 correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$H_{3} A s O_{3} + K I_{3} + H_{2} O ⟶ H_{3} A s O_{4} + K I + 2 H I$
-1/3 -1 -1
As we know,
Eq. wt. $= \frac{m o l a r w e i g h t}{n - f a c t o r}$
So, change in oxidation state of $I = \frac{2}{3}$ .
$∴$ For $3 I$ atoms, change= $2$
So, Eq. wt. of $K I_{3} = \frac{M}{2} = \frac{420}{2} = 210$ .

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