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Which of the following aqueous molal solution have highest freezing point

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Which of the following aqueous molal solution have highest freezing point
A. Urea
B. Barium chloride
C. Potassium bromide
D. Alluminimum sulphate
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Correct Answer - A
`KBr=K+Br^(-)=2 ions`
`BaCl_(2)=B^(2+)+2CL^(-)=3 ions`
`:.` urea is not ionised hence it is shows highest freezing point.
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