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What amount of urea dissolved in 1 kg water at constant temperature, so that vapour pressure of the solution reduced by 2% ?

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What amount of urea dissolved in 1 kg water at constant temperature, so that vapour pressure of the solution reduced by 2% ? ( M.W of urea = 60 gm/mole)

(a)  68 gm

(b)  60 gm

(c)  50 gm

(d)   75 gm 

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Correct option  (a)  68 gm.

Explanation :

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