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The amount of urea to be dissolved in `500` cc of water `(K_(f)=1.86)` to produce a depresssion of `0.186^(@)C` in the freezing point is :
A. 9 g
B. 6 g
C. 3 g
D. `0.3g`

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Correct Answer - C
`DeltaT_(f)=(100xxK_(f)xxw)/(mxxW)`
`:.0.186=(100xx18.6xxw)/(60xx500)orw=3g`

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