Moles of \( \mathrm{Na}_{2} \mathrm{SO}_{4} \) to be dissolved in 12 mole water to lower its vap...

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Moles of \( \mathrm{Na}_{2} \mathrm{SO}_{4} \) to be dissolved in 12 mole water to lower its vapour pressure by \( 10 \mathrm{~mm} \mathrm{Hg} \) at a temperature at which vapour pressure of pure water is \( 50 \mathrm{~mm} \) is:
(a) \( 1.5 \) mole
(b) 2 mole
(c) 1 mole
(d) 3 mole
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