In the following
$N {O_{3}}^{-} + A s_{2} S_{3} + H_{2} O \to A s O_{4}^{3 -} + N O + S O_{4}^{2 -} + H^{+}$
Equivalent weight of $A s_{2} S_{3}$ (Molecular weight M) is

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$\frac{3 M}{28}$

$\frac{M}{4}$

$\frac{M}{24}$

$\frac{M}{28}$

answer is D.

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Detailed Solution

$2 A s^{+ 3} \to 2 A s^{5 +} + 4 e^{- 1} 3 s^{2 -} \to 3 s^{6 +} + 24 e^{- 1} 2 A s^{3 +} + 35^{2 -} \to 2 A s^{5 +} + 3 s^{6 +} + 2 B e^{- 1} E_{A s_{2} S_{3}} = \frac{M}{28}$

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