1.

The freezing point of water is depressed by 0.37^@C in a 0.01 molal NaCl solution. The freezing point of 0.02 molal solution of urea is depressed by

Answer»

`0.37^@C`
`0.74^@C`
`0.185^(@)C`
`0^(@)C`

Solution :The depression in freezing point is proprtional to motal concentration of the solute IE.
`Delta T_f PROP m`
`DeltaT_f = K_fmi or K_f = (DeltaT_f)/(ixxm) =` constant
so, `(DeltaT_(f_(NACL)))/(i_(NaCl XX m_(NaCl)))=(Delta T_(furea))/(m_(Urea)xxi_(Urea))=` constant
`(0.37)/(2xx001) = (DeltaT_(fUrea))/(0.02 xx 1)rArr Delta T_(fUrea) = (0.37 xx 0.02)/(0.02) =0.37^@C`


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