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

At $30^{\circ} \mathrm{C}$ the solubility of $\mathrm{PbI}_2$ salt in 0.2 M KI solution will be $X$, if the solubility product of $\mathrm{PbI}_2$ at $30^{\circ} \mathrm{C}$ is $2.4 \times 10^{-8}$. Identify the value of $X$.

A

$4.8 \times 10^{-7} \mathrm{M}$

B

$6.0 \times 10^{-7} \mathrm{M}$

C

$2.4 \times 10^{-8} \mathrm{M}$

D

$3.0 \times 10^{-8} \mathrm{M}$

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

An unsaturated organic compound $\left(\mathrm{C}_3 \mathrm{H}_6\right)$, undergoes the following series of reactions:

COMEDK 2026 Afternoon Shift Chemistry - Hydrocarbons Question 2 English

Identify compound [D]

A

Cyclohexane

B

2,3-dimethylbutane

C

Hexane

D

2-methyl pentane

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

An equilibrium mixture taken in 2 litre vessel of the reaction: $2 \mathrm{SO}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_3(\mathrm{~g})$ has 4 moles of $\mathrm{SO}_2, 3$ moles of $\mathrm{O}_2$ and 6 moles of $\mathrm{SO}_3$ then the value of equilibrium constant $\left(\mathrm{K}_c\right)$ will be:

A

$15 \mathrm{~mol} \mathrm{~L}^{-1}$

B

$0.75 \mathrm{~L} \mathrm{~mol}^{-1}$

C

$1.5 \mathrm{~L} \mathrm{~mol}^{-1}$

D

$0.15 \mathrm{~mol} \mathrm{~L}^{-1}$

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

A first order reaction is $50 \%$ complete in 30 minutes at 300 K and in 10 minutes at 320 K . The activation energy of the reaction ( $E_a$ ) is: $\left[R=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1} ; \log 2=0.3010 ; \log 3=0.4771\right]$

A

$75.2 \mathrm{~kJ} \mathrm{~mol}^{-1}$

B

$43.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$

C

$23.7 \mathrm{~kJ} \mathrm{~mol}^{-1}$

D

$52.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$