1
MCQ (Single Correct Answer)

AIPMT 2015 Cancelled Paper

Which of them is not equal to zero for an ideal solution?
A
$$\Delta {V_{mix}}$$
B
$$\Delta P = {P_{observed}} - {P_{Raoult}}$$
C
$$\Delta {H_{mix}}$$
D
$$\Delta {S_{mix}}$$

Explanation

For an ideal solution, $$\Delta $$Smix > 0 while $$\Delta $$Hmix, $$\Delta $$Vmix and $$\Delta $$P all are 0.
2
MCQ (Single Correct Answer)

AIPMT 2015

What is the mole fraction of the solute in a 1.00 m aqueous solution?
A
1.770
B
0.0354
C
0.0177
D
0.177

Explanation

Number of moles of water in 1000 g = $${{1000} \over {18}}$$ = 55.56 mol

Thus, mole fraction of solute = $${1 \over {1 + 55.56}}$$ = 0.0177
3
MCQ (Single Correct Answer)

AIPMT 2015 Cancelled Paper

The boiling point of 0.2 mol kg$$-$$1 solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case?
A
Molecular mass of X is less than the molecular mass of Y.
B
Y is undergoing dissociation in water while X undergoes no change.
C
X is indergoing dissociation in water.
D
Molecular mass of X is greater than the molecular mass of Y.

Explanation

$$\Delta $$Tb = iKbm

Given, ($$\Delta $$Tb)x > ($$\Delta $$Tb)y

$$ \therefore $$ ixKbm > iyKbm

$$ \Rightarrow $$ ix > iy

(Kb is same for same solvent)

So, x is undergoing dissociation in water.
4
MCQ (Single Correct Answer)

AIPMT 2014

Of the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression?
A
KCl
B
C6H12O6
C
Al2(SO4)3
D
K2SO4

Explanation

We know that depression in freezing point ($$\Delta $$Tf ) is given as

$$\Delta $$Tf = iKfm

So, $$\Delta $$Tf $$ \propto $$ i

Thus, more value of i (Van’t Hoff factor), more will be depression in freezing point.

Al2(SO4)3 ⇌ 2Al+3 + 3SO42–

i is maximum i.e., 5 for Al2(SO4)3. .

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