Q.

Which of the following aqueous molal solution have highest freezing point

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a

Urea

b

Barium chloride

c

Potassium bromide

d

Aluminium sulphate

answer is A.

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Detailed Solution

KBr=K+Br−=2 ionsBaCl2=B2++2Cl−=3 ionsAl2SO43→2Al+3+3SO4-2⇒5 ions∴ urea is not ionised hence it is shows highest freezing point. ∆Tf α 1Freezing point of solution
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Which of the following aqueous molal solution have highest freezing point