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Q.

The van't Hoff factor,(i) for a dilute aqueous solution of Na₂SO₄ is

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a

$1 + α$

b

$1 + 2 α$

c

$1 - 2 α$

d

$1 - α$

answer is C.

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Detailed Solution

$\begin{array}{ccc} {Na}_{2} {SO}_{4} = & 2 {Na}^{+} & {SO}_{4}^{2 -} \\ 1 & 0 & 0 \\ 1 - α & 2 α & α \end{array}$

where $α$ is degree of dissociation

$∴ i = 1 - α + 2 α + α = 1 + 2 α$

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