A certain substance ‘A’ tetramerises in water to the extent of 80%. A solution of 2.5g of A in 100 g of water lowers the freezing point by 0.3oC. The molar mass of A is

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answer is D.

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Detailed Solution

α=n1-in-1 n-1α =n1-i n-1αn=1-i i =1-n-1αn i =1-4-10.84 i =1-2.44 i =0.4 ΔTf=i×Kf×m0.3=0.4×1.86×wB×1000mB×wA0.3=0.4×1.86×2.5×1000mB×100mB=62

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