A solution of urea (molar mass 56) boils...

A solution of urea (molar mass 56) boils at `100.18^@C` at atmospheric pressure. If `K_f` and `K_g` for water are 1.86 and 0.512 K `"molality"^(-1)` respectively, the above solution will freeze at

A

`-6.54^@C`

B

`6.54^@C`

C

`-0.654^@C`

D

`0.654^@C`

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The correct Answer is:

C

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