1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A non-volatile solute A weighing 60 g when dissolved in 212 g of the solvent Xylene reduces its vapour pressure to $60 \%$. What is the Molar mass of A in $\mathrm{g} / \mathrm{mol}$ ? [MM of xylene $=106 \mathrm{~g} / \mathrm{mol}$ ]
A
56
B
126
C
60
D
45
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two statements, one Assertion (A) and the other Reason (R) are given. Choose the correct option.

Assertion: Compound $[\mathrm{X}]$ reacts with Hydrazine in presence of $\mathrm{KOH} /$ Glycol to form the product $[\mathrm{Y}]$.

COMEDK 2025 Morning Shift Chemistry - Aldehyde and Ketone Question 2 English

Reason: Reduction reaction occurs and Carbonyl group is reduced to Methylene group.

A
Both A and R are correct but R is not the correct explanation of A .
B
Both A and R are correct and R is the correct explanation of A .
C
A is wrong but R is correct.
D
A is correct but R is wrong.
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
For a 1.0 molal solution containing the non-volatile solute Urea, the elevation in boiling point is 2.0 K while the depression in freezing point in a 3.0 molal solution having the same solvent is $4.0 K$. If the ratio $\frac{K_b}{K_f}=\frac{1}{X}$, what is the value of $X$ ?
A
$\frac{1}{2}$
B
$\frac{1}{4}$
C
$\frac{2}{3}$
D
$\frac{3}{2}$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Identify the correct statement.
A
The central atoms in both $\mathrm{CH}_4$ and $\mathrm{SF}_4$ are in a state of $\mathrm{sp}^3$ hybridisation
B
The resultant dipole moment of $\mathrm{NF}_3$ is greater than that of $\mathrm{NH}_3$
C
The $\mathrm{C}-\mathrm{O}$ bond length in $\mathrm{CO}_2$ molecule is 110 pm because of the Inductive effect $(+\mathrm{I})$ of oxygen
D
A molecule of the type $\mathrm{AB}_5 \mathrm{E}$ where the central atom has 5 bond pairs and 1 lone pair has a square pyramid geometry
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