1
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$ \text { Match the mixtures listed in Column I with the correct method used for their separation. } $$

$$
\text { Column I }
$$
$$
\text { Column I }
$$
A Glycerol from spent Lye P Steam distillation
B Mixture of Benzoic acid and Naphthalene dissolved in organic solvent Q Distillation
C Aniline & Chloroform R Distillation under reduced pressure
D 2- Nitrophenol & 4- Nitrophenol S Differential extraction using $\mathrm{NaHCO}_3$
A

$$ A-Q \quad B-R \quad C-S \quad D-P $$

B

$$ A-Q \quad B-R \quad C-S \quad D-P $$

C

$$ A-R \quad B-S \quad C-Q \quad D-P $$

D

$$ A-R \quad B-P \quad C-S \quad D-Q $$

2
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

An aqueous solution of an unknown solute " $X$ " is prepared by adding 4.0 g of it into 2.0 moles of water. What is the mass percent of " $X$ " in the aqueous solution?

A

20

B

40

C

15

D

10

3
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The rate constants for two different reactions, $\mathrm{k}_1$ and $\mathrm{k}_2$ are $10^{16} \cdot \mathrm{e}^{-2000 / \mathrm{T}}$ and $10^{15} \cdot \mathrm{e}^{-1000 / \mathrm{T}}$ respectively. The temperature at which $k_1=k_2$ is

A

$1000 K$

B

$\frac{2000}{2.303} K$

C

$\frac{1000}{2.303} K$

D

$2000 K$

4
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The hybridisation of atomic orbitals of nitrogen in $\mathrm{NO}_2{ }^{+}, \mathrm{NO}_3{ }^{-}$and $\mathrm{NH}_4{ }^{+}$are respectively

A

$s p, s p^2, s p^3$

B

$s p, s p^3, s p^2$

C

$s p^2, s p^2, s p^3$

D

$s p^2, s p, s p^3$