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Q.

Substance A tetramerises in water to the extent of 80%. A solution of 2.5g of A in 100g of water lowers the freezing point by 0.30C. The molar mass of A is Kf for  water =1.86K kg mol−1

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a

122

b

31

c

244

d

62

answer is D.

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Detailed Solution

α=1−i1−1n0.8=1−i1−14⇒i=0.4ΔTf=i×Kf×m0.3=0.4×1.86×2.5×1000mB×100mB=62

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