10
MCQ (Single Correct Answer)
The unit of ebullioscopic constant is
A
$\mathrm{K} \mathrm{~kg} \mathrm{~mol}^{-1}$ or K (molality) ${ }^{-1}$
B
$\mathrm{mol} \mathrm{~kg} \mathrm{~K}^{-1}$ or $\mathrm{K}^{-1}$ (molality)
C
$\mathrm{kg} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$ or $\mathrm{K}^{-1}$ (molality) $)^{-1}$
D
$\mathrm{K} \mathrm{~mol} \mathrm{~kg}^{-1}$ or K (molality)
11
MCQ (Single Correct Answer)
In comparison to a 0.01 M solution of glucose, the depression in freezing point of a $0.01 \mathrm{M} \mathrm{MgCl}_2$ solution is ........... .
A
the same
B
about twice
C
about three times
D
about six times
12
MCQ (Single Correct Answer)
An unripe mango placed in a concentrated salt solution to prepare pickle shrivels because ............. .
A
it gains water due to osmosis
B
it loses water due to reverse osmosis
C
it gains water due to reverse osmosis
D
it loses water due to osmosis
13
MCQ (Single Correct Answer)
At a given temperature, osmotic pressure of a concentrated solution of a substance ............ .
A
is higher than that of a dilute solution
B
is lower than that of a dilute solution
C
is same as that of a dilute solution
D
cannot be compared with osmotic pressure of dilute solution
14
MCQ (Single Correct Answer)
Which of the following statements is false?
A
Two different solutions of sucrose of same molality prepared in different solvents will have the same depression in freezing point.
B
The osmotic pressure of a solution is given by the equation $\pi=C R T$ (where, $C$ is the molarity of the solution)
C
Decreasing order of osmotic pressure for 0.01 M aqueous solutions of barium chloride, potassium chloride, acetic acid and sucrose is
$$\mathrm{BaCl}_2>\mathrm{KCl}>\mathrm{CH}_3 \mathrm{COOH}>\text { sucrose }$$
D
According to Raoult's law, the vapour pressure exerted by a volatile component of a solution is directly proportional to its mole fraction in the solution