If $α$ is the degree of dissociation of $N a_{2} S O_{4}$ the van't Hoff''s factor $(i)$ used for calculating the molecular mass is

1 + α

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1 - α

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1 + 2 α

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1 - α

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Solution

The correct option is C $1 + 2 α$
$N a_{2} S O_{4} ⇌ 2 N a^{+} + S O_{4}^{2 -}$
$\begin{matrix} 1 & 0 & 0 1 - α & 2 α & α \end{matrix}$
Van't Hoff factor (i) $= \frac{1 - α + 2 α + α}{1} = 1 + 2 α$

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