Redox and Equivalent ConceptHard

Question

In the following reaction (unbalanced), equivalent weight of As2S3 is related to its molecular weight, M, by

As2S3 + H+ + NO3− → NO + H2O + AsO43− + SO42−

Options

A.M/2
B.M/4
C.M/28
D.M/24

Solution

$As_{2}S_{3} + 20H_{2}O + 28e^{-} \rightarrow 2AsO_{4}^{3 -} + 3SO_{4}^{2 -} + 40H^{+}$

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