In the disproportionation : ; the factor of is :

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Problem

In the disproportionation :

\text{H}_3\text{PO}_2 \longrightarrow \text{PH}_3 + \text{H}_3\text{PO}_3

; the

n

factor of

\text{H}_3\text{PO}_2

is : (1)

\frac{3}{4}

(2)

\frac{4}{3}

(3)

\frac{2}{3}

(4)

\frac{3}{2}