If \( \alpha \) is the degree of dissociation of \( \mathrm{Na}_{2} \mathrm{SO}_{4} \), the Vant...

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If \( \alpha \) is the degree of dissociation of \( \mathrm{Na}_{2} \mathrm{SO}_{4} \), the Vant Hoff's factor \( (i) \) used for calculating the molecular mass is
(a) \( 1+\alpha \)
(b) \( 1-\alpha \)
(c) \( 1+2 \alpha \)
(d) \( 1-2 \alpha \)
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