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25
MCQ (Single Correct Answer)

On the basis of information given below mark the correct option. Information On adding acetone to methanol some of the hydrogen bonds between methanol molecules break.

A
At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show positive deviation from Raoult's law
B
At specific composition methanol-acetone mixture will form maximum boiling azeotrope and will show positive deviation from Raoult's law
C
At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show negative deviation from Raoult's law
D
At specific composition methanol-acetone mixture will form maximum boiling azeotrope and will show negative deviation from Raoult's law
26
MCQ (Single Correct Answer)

$\mathrm{K}_{\mathrm{H}}$ value for $\mathrm{Ar}(\mathrm{g}), \mathrm{CO}_2(\mathrm{~g}), \mathrm{HCHO}(\mathrm{g})$ and $\mathrm{CH}_4(\mathrm{~g})$ are 40.39, 1.67, $1.83 \times 10^{-5}$ and 0.413 respectively.

Arrange these gases in the order of their increasing solubility.

A
$\mathrm{HCHO}<\mathrm{CH}_4<\mathrm{CO}_2<\mathrm{Ar}$
B
$\mathrm{HCHO}<\mathrm{CO}_2<\mathrm{CH}_4<\mathrm{Ar}$
C
$\mathrm{Ar}<\mathrm{CO}_2<\mathrm{CH}_4<\mathrm{HCHO}$
D
$\mathrm{Ar}<\mathrm{CH}_4<\mathrm{CO}_2<\mathrm{HCHO}$
27
MCQ (Multiple Correct Answer)

Which of the following factor(s)affect the solubility of a gaseous solute in the fixed volume of liquid solvent?

(i) Nature of solute (ii) Temperature (iii) Pressure

A
(i) and (iii) at constant $T$
B
(i) and (ii) at constant $p$
C
(ii) and (iii)
D
Only (iii)
28
MCQ (Multiple Correct Answer)

Intermolecular forces between two benzene molecules are nearly of same strength as those between two toluene molecules. For a mixture of benzene and toluene, which of the following are not true?

A
$\Delta_{\text {mix }} H=$ zero
B
$\Delta_{\text {mix }} V=$ zero
C
These will form minimum boiling azeotrope
D
These will not form ideal solution
29
MCQ (Multiple Correct Answer)

Relative lowering of vapour pressure is a colligative property because ......... .

A
it depends on the concentration of a non-electrolyte solute in solution and does not depend on the nature of the solute molecules
B
it depends on number of particles of electrolyte solute in solution and does not depend on the nature of the solute particles
C
it depends on the concentration of a non-electrolyte solute in solution as well as on the nature of the solute molecules
D
it depends on the concentration of an electrolyte or non-electrolyte solute in solution as well as on the nature of solute molecules
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