Solutions Question 72

Question: The freezing point of one molal NaCl solution assuming NaCl to be 100% dissociated in water is (molal depression constant = 1.86) [CPMT 1985; BHU 1981; MP PMT 1997; UPSEAT 2001]

Options:

A) 1.86oC

B) 3.72oC

C) +1.86oC

D) +3.72oC

Show Answer

Answer:

Correct Answer: B

Solution:

For NaCl

i=2

ΔTf=2Kfm=2×1.86×1=3.72

Ts=TΔTf=03.72=3.72C



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