Equivalent mass of in is :

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Problem

Equivalent mass of

\text{As}_2\text{S}_3

\text{As}_2\text{S}_5 + \text{HNO}_3 \longrightarrow \text{H}_2\text{SO}_4 + \text{NO}_2 + \text{H}_3\text{AsO}_4 + \text{H}_2\text{O}

is : (1)

M/20

(2)

M/40

(3)

M/10

(4)

M/5