a. Relative lowering of vapour pressure is independent
b. The vapour pressure is a colligative property
c. Vapour pressure of a solution is lower than the vapour pressure of the solvent
d. The relative lowering of vapour pressure is directly proportional to the original pressure
Ans. d
Explanation : According to Raoult’s law, the relative lowering in vapour pressure of a dilute solution is equal to mole fraction of the solute present in the solution
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dm-3 sucrose solution at 20 ° C (molar gas constant, R = 8.314 JK -1 mol -1 ; 1 dm-3 = 0.001 m3 ) a. 4870 Pa b. 4.87 Pa c. 0.00487 Pa d. 0.33 Pa Ans. a (17)
