Q43 / 200 · Manipal (MET) 2014 · Chemistry

If in a solvent, $n$ simple molecules of solute combine to form an associated molecule, $\alpha$ is the degree of association, the van't Hoff's factor is equal to

  • A
    $\frac{1}{1-n \alpha}$
  • B
    $1-\alpha+n \alpha$
  • Correct answer
    C
    $1-\alpha+\frac{\alpha}{n}$
  • D
    $\frac{\alpha}{n}-1+\alpha$

Solution

$\begin{aligned} \underset{(1-\alpha)}{n A} \rightleftharpoons & A_{\frac{\alpha}{n}} \\ & i=1-\alpha+\frac{\alpha}{n}\end{aligned}$

Hence, the correct answer is option: 'C'.

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