38. Which of the following associated with isotonic solutions, is not correct
a. They will have the same osmotic pressure
b. They have the same weight concentrations
c. Osmosis does not take place when the two solutions are separated by a semipermeable membrane
d. They will have the same vapour pressure
Ans. d
Explanation : Vapour pressure depends on the interaction between molecules of solute and solvent wehreas osmotic pressure depends on the concentration of solute only
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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)
