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One mole of a solute \( A \) is dissolved in a given volume of a solvent. The association of the solute take place as follows:
\[
n A \rightleftharpoons A_{n}
\]
If \( \alpha \) is the degree of association of \( A \), the van't Hoff factor \( i \) is expressed as:
(a) \( i=1-\alpha \)
(b) \( i=1+\frac{\alpha}{n} \)
(c) \( i=\frac{1-\alpha+\frac{\alpha}{n}}{1} \)
(d) \( i=1 \)
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