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

In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below.

Assertion (A): van't Hoff factor for a solution of benzoic acid in benzene is less than one.

Reason(R): Benzoic acid undergoes dissociation in benzene and its calculated molecular mass using colligative properties is lower than its actual molecular mass.

A
Assertion (A) and Reason (R) are correct
B
Assertion (A) and incorrect and Reason (R) is correct
C
Assertion (A) is correct but Reason (R) is incorrect
D
Both Assertion (A) and Reason (R) are incorrect
2
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
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

What is the amount of ice that separates out on cooling a solution containing $$60 \mathrm{~g}$$ of Ethylene glycol in $$250 \mathrm{~g}$$ of water to $$-9.3^{\circ} \mathrm{C}$$ ? $$\mathrm{K}_{\mathrm{f}}$$ of $$\mathrm{H}_2 \mathrm{O}=1.86 \mathrm{~K} / \mathrm{m} ;$$ MM of ethylene glycol= $$62 \mathrm{~amu}$$

A
90.2 g
B
56.45 g
C
195 g
D
193.55 g
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$\text { If a compound } \mathrm{X}_3 \mathrm{Y} \text { is } 60 \% \text { ionised in aqueous medium, what is its van't Hoff factor value? }$$

A
3.1
B
0.8
C
0.6
D
2.8
COMEDK Subjects
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