1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The Activation energy for the reaction $$A \rightarrow B+C$$, at a temperature $$\mathrm{TK}$$ was $$0.04606 \mathrm{~RT} \mathrm{~J} / \mathrm{mol}$$. What is the ratio of Arrhenius factor to the Rate constant for this reaction?

A
1.585
B
$$3.2 \times 10^{-2}$$
C
$$1.047 \times 10^{-2}$$
D
1.047
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

The temperature $$(\mathrm{T})$$ and rate constant $$(\mathrm{k})$$ for a first order reaction $$\mathrm{R} \rightarrow \mathrm{P}$$, was found to follow the equation $$\log \mathrm{k}=-(2000) \frac{1}{\mathrm{~T}}+8.0$$. The pre-exponential factor '$$\mathrm{A}$$' and activation energy $$\mathrm{E}_{\mathrm{a}}$$, respectively are: [Given: $$\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$$]

A
$$ 8.0 \mathrm{~s}^{-1} \text { and } 16.6 \mathrm{~kJ} \mathrm{~mol}^{-1} $$
B
$$ 6.0 \mathrm{~s}^{-1} \text { and } 10^8 \mathrm{~kJ} \mathrm{~mol}^{-1} $$
C
$$ 1 \times 10^8 \mathrm{~s}^{-1} \text { and } 38.3 \mathrm{~kJ} \mathrm{~mol}^{-1} $$
D
$$ 1 \times 10^{-8} \mathrm{~s}^{-1} \text { and } 16.6 \mathrm{~kJ} \mathrm{~mol}^{-1} $$
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Given below a first order reaction in the gas phase

$$\mathrm{A}(\mathrm{g}) \rightarrow \mathrm{B}(\mathrm{g})+\mathrm{C}(\mathrm{g})$$

If the initial pressure of the system is $$\mathrm{P}_{\mathrm{i}}$$ and the total pressure at $$\mathrm{t}$$ seconds is $$\mathrm{P}_{\mathrm{t}}$$, the rate constant $$\mathrm{k}$$ for the reaction is:

A
$$ \mathrm{k}=\frac{2.303}{\mathrm{t}} \log \frac{\mathrm{P}_{\mathrm{i}}}{\mathrm{P}_{\mathrm{t}}} $$
B
$$ \mathrm{k}=\frac{2.303}{\mathrm{t}} \log \frac{\mathrm{P}_{\mathrm{i}}}{\left(2 \mathrm{P}_{\mathrm{i}}-\mathrm{P}_{\mathrm{t}}\right)} $$
C
$$ \mathrm{k}=\frac{2.303}{\mathrm{t}} \log \frac{\mathrm{P}_{\mathrm{i}}}{\left(2 \mathrm{P}_{\mathrm{i}}+\mathrm{x}\right)} $$
D
$$ \mathrm{k}=\frac{2.303}{\mathrm{t}} \log \frac{\mathrm{P}_{\mathrm{i}}}{\left(\mathrm{P}_{\mathrm{i}}+\mathrm{x}\right)} $$
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

For the reaction, $$\mathrm{A}+3 \mathrm{~B} \rightarrow 2 \mathrm{C}+\mathrm{D}$$, the concentration of $$\mathrm{A}$$ changes from 0.0150 to 0.0125 in 1 minute. The rate of formation of $$\mathrm{C}$$ in $$\mathrm{mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$$ is:

A
$$6.32 \times 10^{-5}$$
B
$$8.32 \times 10^{-5}$$
C
$$3.26 \times 10^{-5}$$
D
$$2.5 \times 10^{-5}$$
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