If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water (ΔTf), when 0.01 mole of sodium sulphate is dissolved in 1 kg of water, is (Kf=1.86 K kg mol−1)

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0.0372 K

0.0558 K

0.0744 K

0.0186 K

answer is B.

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Detailed Solution

Na2SO4→2Na++SO42−Van't Hoff factor (i) for Na2SO4=3ΔTf=i×Kf×m=3×1.86×0.01[∵ m=0.01 mol1 kg=0.01 mol kg−1]=0.0558 K

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