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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a
MA = 4MB
b
MA = MB
c
MA = 0.5 MB
d
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