Assertion :In the balanced redox reaction:
$x A s_{2} S_{3} + y N O_{3}^{-} + 4 H_{2} O \to a A s O_{4}^{3 -} + b N O + c S O_{4}^{2 -} + 8 H^{+}$ , the $n$ -factor of $A s_{2} S_{3}$ and $N O_{3}^{-}$ is $28$ and $3$ , respectively. Reason: Molar ratio is reciprocal of $n$ -factor's ratio so, $x : y = 3 : 28$ .

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$x A s_{2} S_{3} + y N O_{3}^{-} + 4 H_{2} O \to a A s O_{4}^{3 -} + b N O + c S O_{4}^{2 -} + 8 H^{+}$
$n$ -factor of $A s_{2} S_{3}$ is $28$ and $N O_{3}^{-}$ is $3$ .
As number of equivalents of all reactants are same, their molar ratio is reciprocal of $n$ -factor's ratio.
Therefore, $x : y = 3 : 28$ .
Hence, both assertion and reason are correct and reason is the correct explanation for assertion.

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Assertion :In the balanced redox reaction: xAs2S3+yNO−3+4H2O→aAsO3−4+bNO+cSO2−4+8H+, the n-factor of As2S3 and NO−3 is 28 and 3, respectively. Reason: Molar ratio is reciprocal of n-factor's ratio so, x:y=3:28.