1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Given that the freezing point of benzene is $$5.48^{\circ} \mathrm{C}$$ and its $$\mathrm{K}_{\mathrm{f}}$$ value is $$5.12{ }^{\circ} \mathrm{C} / \mathrm{m}$$. What would be the freezing point of a solution of $$20 \mathrm{~g}$$ of propane in $$400 \mathrm{~g}$$ of benzene?

A
$$-0.34^{\circ} \mathrm{C}$$
B
$$-0.17^{\circ} \mathrm{C}$$
C
$$-5.8^{\circ} \mathrm{C}$$
D
$$-0.2{ }^{\circ} \mathrm{C}$$
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A solute $$\mathrm{X}$$ is found to exist as a dimer in water. A 4 molal solution of $$\mathrm{X}$$ shows a boiling point of $$101.04^{\circ} \mathrm{C}$$. What is the percentage association of $$\mathrm{X}$$ ? ($$\mathrm{K}_{\mathrm{b}}$$ for water $$=0.52 \mathrm{~K} / \mathrm{m}$$).

A
75
B
100
C
80
D
40
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

$$200 \mathrm{ml}$$ of an aqueous solution contains $$3.6 \mathrm{~g}$$ of Glucose and $$1.2 \mathrm{~g}$$ of Urea maintained at a temperature equal to $$27^{\circ} \mathrm{C}$$. What is the Osmotic pressure of the solution in atmosphere units?

$$\mathrm{R}=0.082 \mathrm{~L} \mathrm{~atm} \mathrm{~K}{ }^{-1} \mathrm{~mol}^{-1}$$ : Molecular Formula: Glucose is $$\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6$$ and of Urea is $$\mathrm{NH}_2 \mathrm{CONH}_2$$

A
6.24
B
1.56
C
9.84
D
4.92
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$\mathrm{K}_{\mathrm{H}}$$ for $$\mathrm{O}_2$$ at $$293 \mathrm{~K}$$ is $$34.86 \mathrm{~kbar}$$. What should be the partial pressure of $$\mathrm{O}_2$$ gas so that it has a solubility of $$0.08 \mathrm{~g} / \mathrm{L}$$ in water at $$293 \mathrm{~K}$$ ? (Density of solution $$=1 \mathrm{~g} / \mathrm{ml}$$)

A
156.8 $$\times$$ 10$$^{-5}$$ bar
B
15680 bar
C
156.8 bar
D
1.569 bar
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