Q. Which of the following $0.1\, M$ aqueous solutions will have the lowest freezing point

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potassium sulphate

sodium chloride

urea

glucose

Solution:

Potassium sulphate gives maximum number of particles (ions). Depression in freezing point depends on number of particles.

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$\frac{1}{2} O _{2}+2 H ^{+}+2 e ^{-} \rightarrow H _{2} O ,$
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$\lambda^{o}_{m}\left(K_{2}SO_{4}\right) = y S\,cm^{2} mol^{-1}$
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