4g of Substance A dissolved in 100g H2O depressed the freezing point of water by 0.1oc. While 4g of another substance B depressed the freezing point by 0.2oc. What is the relation between molecular weights of A and B.

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MA = 4MB

MA = MB

MA = 0.5 MB

MA = 2MB

answer is D.

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Detailed Solution

∆Tf=Kf m 0.1=Kf×4MA×1000100 0.2×MB40=0.1×MA40 ⇒MA=2MB

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