1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Two chemical reactions of the same order have equal Frequency factor value. Their Activation energies differ by $26.8 \mathrm{~kJ} / \mathrm{mol}$. At 300 K if $k_2=x k_1$ find the value of $x$.
A
$4.631 \times 10^4$
B
$1.143 \times 10^3$
C
$2.286 \times 10^3$
D
4.665
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
For a given reaction of the type $\frac{3}{5} X(a q) \rightarrow \frac{1}{2} Y(a q)+Z(g)$, the correct expression for the rate of disappearance of $X$ with reference to $Y$ is ___________
A
$-d \frac{[X]}{d t}=+\frac{6}{5} d \frac{[Y]}{d t}$
B
$-d \frac{[X]}{d t}=+\frac{5}{6} d \frac{[Y]}{d t}$
C
$-d \frac{[X]}{d t}=+\frac{3}{10} d \frac{[Y]}{d t}$
D
$-d \frac{[X]}{d t}=d \frac{[Y]^{1 / 2}}{d t}$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
$\mathrm{X} \rightarrow 2 \mathrm{Y}$ is a first order reaction where $1.0 \mathrm{~mol} / \mathrm{L}$ of the reactant yields $0.4 \mathrm{~mol} / \mathrm{L}$ of Y in 200 minutes. Calculate the half-life period of the reaction in minutes.
A
151.24
B
203.69
C
620.96
D
271.34
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The following results were obtained during study of the reaction $2 \mathrm{NO}(\mathrm{g})+\mathrm{Cl}_2(\mathrm{~g}) \rightarrow 2 \mathrm{NOCl}(\mathrm{g})$. Determine the value of $[\mathrm{X}]$ in $\mathrm{mol} / \mathrm{L}$

Experiment [NO]
mol / L
[Cl$_2$]
mol / L
Initial rate of formation. [NOCl]
mol / L / min
I 0.2 0.2 $6.0 \times 10^{-3}$
II 0.2 0.4 $2.4 \times 10^{-2}$
III 0.4 0.2 $1.2 \times 10^{-2}$
IV X 0.6 $1.35 \times 10^{-1}$

A
$\mathrm{[X]=0.8}$
B
$[\mathrm{X}]=0.3$
C
$\mathrm{[X]=0.4}$
D
$[\mathrm{X}]=0.5$
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