Ncert Exercises & Solutions

The incorrect statement among the following is:

1.	Two different solutions of sucrose of the same molality prepared in different solvents will have the same depression in freezing point.
2.	The osmotic pressure of a solution is given by the equation π = CRT (where C is the molarity of the solution)
3.	Decreasing order of osmotic pressure for 0.01 M aqueous solutions of BaCl₂ > KCl > CH₃COOH > sucrose
4.	The vapour pressure exerted by a volatile component of a solution is directly proportional to its mole fraction in the solution.

Hint: Every solvent has it's

K_{f}

value.

According to the definition of depression in freezing point

∆

T_f = K_f m

where, K_f = freezing point depression constant, the value of K_f depends upon the nature of the solvent. Although

the solution has the same molality. But solvent is different and their K_f value is also different. Thus, two different solutions of

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

N.B = for a solution containing non volatile solute, VP is directly proportional to mole fraction of solvent
and
for a solution containing volatile solute, VP is directly proportional to mole fraction of solute or solvent present in the solution

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions