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

Consider the gaseous equilibrium

$2 \mathrm{AB}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{AB}_{(\mathrm{g})}+\mathrm{B}_{2(\mathrm{~g})}$

The expression relating the degree of dissociation ( $\alpha$ ) and equilibrium constant ( $K_p$ ) and total pressure $P$ is:

A

$\left(\frac{2 K_p}{P}\right)^2$

B

$\left(\frac{K_p}{2 P}\right)^{1 / 2}$

C

$\left(\frac{K_p}{2 P}\right)^{1 / 3}$

D

$\left(\frac{2 K_p}{P}\right)^{1 / 3}$

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

Which one of the following statements is wrong?

A

Anisole reacts with Ethanoyl chloride / anhydrous $\mathrm{AlCl}_3$ in $\mathrm{CS}_2$ to form 4-Methoxyacetophenone in larger amount

B

Isopropyl methyl ether reacts with Conc. HI to produce isopropyl alcohol and methyl iodide by $\mathrm{S}_{\mathrm{N}} 2$ mechanism

C

Tert. butyl methyl ether reacts with Conc. HI on heating to form 2-lodo-2-methylpropane and Methanol by $\mathrm{S}_{\mathrm{N}} 1$ mechanism

D

Anisole is prepared by reaction between Bromobenzene and Sodium methoxide

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

$60 \%$ of a first order reaction was completed in 60 min , then $50 \%$ of the same reaction can be completed in: $[\log 4=0.60, \log 5=0.69]$

A

60 min

B

65 min

C

50 min

D

45 min

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

Consider a Galvanic cell in which the following reactions occurs: $\mathrm{Fe}^{2+}(\mathrm{aq})+\mathrm{Ag}^{+}(\mathrm{aq}) \rightarrow \mathrm{Fe}^{3+}(\mathrm{aq})+\mathrm{Ag}(\mathrm{s})$. What is the standard potential of the cell? Given: $\mathrm{E}^0\left(\mathrm{Ag}^{+} / \mathrm{Ag}\right)=\mathrm{aV} \quad \mathrm{E}^0\left(\mathrm{Fe}^{2+} / \mathrm{Fe}\right)=\mathrm{bV} \quad \& \quad \mathrm{E}^0\left(\mathrm{Fe}^{3+} / \mathrm{Fe}\right)=\mathrm{cV}$

A

$(a+2 b-3 c) V$

B

$(a+b+2 c) V$

C

$(a-2 c+b) V$

D

$(a+c-2 b) V$