If P₁, P₂ and P₃ are the vapour pressure of equimolar solutions of glucose , NaCl and urea then ......
1 point
(A) P₁ = P₂ = P₃
(B) P₁ = P₃ < P₂
(C) P₁= P₃ > P₂
(D) P₁ > P₂ > P₃
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Answer:
The osmotic pressure is inversely proportional to the molecular weight.
The increasing order of molecular weights is urea < glucose < sucrose.
Hence, the decreasing order of osmotic pressure is P
2
>P
1
>P
3
.
Hence, the correct option is C
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