Q. Which among the following statements is false ?

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A

The correct order of osmotic pressure for aqueous solution of each compound is .

B

The osmotic pressure of a solution is given by the equation where M is the molarity of the solution).

C

Raoult's law states that the vapour pressure of a component over a solution is proportional to its mole fraction.

D

Two sucrose solutions of the same molality prepared in different solvents will have the same freezing point depression.

Solution:

(i) Osmotic pressure
concentration is same so (number of ions)
for and for sucrose
So, order of osmotic pressure
Acetic acid does not dissociate completely. Hence, its van't Hoff factor will be in between 1 and 2.
(ii) The extent of depression in freezing point varies with the number of solute particles for a fixed solvent only, and it's a characteristic feature of the nature of solvent also
For different solvents, value of is also different so, for two different solvents the extent of depression may vary even if same number of solute particles be dissolved in them.

Questions from NTA Abhyas 2022

1. An alkene on ozonolysis gives a mixture of two carbonyl compounds. Mixture on Clemmensen reduction gives just one alkane . is the lowest alkane which in pure form can not be prepared by standard Wurtz method. is

2. A cation is in the centre touches three anions. Assume that the anions also touch each other. The limiting radius ratio, is

3. Blue colour of alkali and alkaline earth metals in liquid is due to

4. Which of the following oxides is strongly basic?

5. In a box hydroiodic acid is taken. After equilibrium the concentration of is found to be . The concentration of at equilibrium in , is

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