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Q.

If $α$ is the degree of dissociation of ${Na}_{2} {SO}_{4}$ the van't Hoff factor (i) used for calculating the molecular mass is:

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a

$1 + 2 α$

b

$1 - α$

c

$1 + α$

d

$1 - 2 α$

answer is C.

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Detailed Solution

In the reaction we have,

${Na}_{2} {SO}_{4} ⟶ 2 {Na}^{+} + {SO}_{4}^{2 -}$

$\begin{array}{ccc} 1 - α & 2 α & α \end{array}$

Thus, the value of van't Hoff factor,

$i = 1 + 2 α$

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If α is the degree of dissociation of Na2SO4 the van't Hoff factor (i) used for calculating the molecular mass is: