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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 degree of association is equal to:
(a) \( \alpha=\frac{\left(K_{b} x-\Delta T_{b}\right)}{\Delta T_{b} \cdot 2} \)
(b) \( \alpha=\frac{2\left(K_{b} x-\Delta T_{b}\right)}{K_{b} x} \)
(c) \( \alpha=2+\frac{2 \Delta T_{b}}{K_{b} x} \)
(d) \( \alpha=\frac{\Delta T_{b}}{2 K_{b} x} \)
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