A dilute solution contains ' \( x \) ' moles of solute \( A \) in \( 1 \mathrm{~kg} \) of solven...

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A dilute solution contains ' \( x \) ' moles of solute \( A \) in \( 1 \mathrm{~kg} \) of solvent with molal elevation constant \( K_{b} \). The solute dimerises in the solution according to the following equation. The degree of association is \( (\alpha) \) :
\[
2 A \rightleftharpoons A_{2}
\]
The van't Hoff factor will be:
(a) \( i=1-2 \alpha \)
(b) \( i=1-\frac{\alpha}{2} \)
(c) \( i=1+\frac{\alpha}{2} \)
(d) \( i=1+\alpha \)
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