Aqueous solutions of \( 0.004 \quad \mathrm{M}-\mathrm{Na}_{2} \mathrm{SO}_{4} \) and \( 0.01 \m...

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Aqueous solutions of \( 0.004 \quad \mathrm{M}-\mathrm{Na}_{2} \mathrm{SO}_{4} \) and \( 0.01 \mathrm{M} \)-Glucose are isotonic. The percentage dissociation of \( \mathrm{Na}_{2} \mathrm{SO}_{4} \) is
(a) \( 25 \% \)
(b) \( 60 \% \)
(c) \( 75 \% \)
(d) \( 40 \% \)
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