Physical Chemistry
Some Basic Concepts of Chemistry
MCQ (Single Correct Answer)
Chemical Equilibrium
MCQ (Single Correct Answer)
Inorganic Chemistry
Periodic Table and Periodicity
MCQ (Single Correct Answer)
Chemical Bonding and Molecular Structure
MCQ (Single Correct Answer)
Hydrogen and It's Compounds
MCQ (Single Correct Answer)
d and f Block Elements
MCQ (Single Correct Answer)
Coordination Compounds
MCQ (Single Correct Answer)
Environmental Chemistry
MCQ (Single Correct Answer)
Organic Chemistry
IUPAC Nomenclatures
MCQ (Single Correct Answer)
General Organic Chemistry
MCQ (Single Correct Answer)
Haloalkanes and Haloarenes
MCQ (Single Correct Answer)
Alcohol, Phenols and Ethers
MCQ (Single Correct Answer)
Aldehyde and Ketone
MCQ (Single Correct Answer)
Carboxylic Acids and Its Derivatives
MCQ (Single Correct Answer)
Compounds Containing Nitrogen
MCQ (Single Correct Answer)
Chemistry in Everyday Life
MCQ (Single Correct Answer)
Practical Organic Chemistry
MCQ (Single Correct Answer)
1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

In the presence of a catalyst at a given temperature of $$27^{\circ} \mathrm{C}$$, the Activation energy of a specific reaction is reduced by $$100 \mathrm{~J} / \mathrm{mol}$$. What is the ratio between the rate constants for the catalysed $$(\mathrm{k}_2)$$ and uncatalysed $$(\mathrm{k}_1)$$ reactions?

A
$$1.04 \times 10^{-2}$$
B
$$2.32 \times 10^{-2}$$
C
1.97
D
1.04
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The following data was recorded for the decomposition of XY compound at 750K

[XY] mol / L Rate of decomposition of XY mol / L s
0.4 $$5.5\times10^{-7}$$
0.8 $$22.0\times10^{-7}$$
1.2 $$49.5\times10^{-7}$$

What is the order of reaction with respect to decomposition of XY?

A
0
B
2
C
1
D
1.5
3
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
4
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
$$ 1 \times 10^{-8} \mathrm{~s}^{-1} \text { and } 16.6 \mathrm{~kJ} \mathrm{~mol}^{-1} $$
COMEDK Subjects