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

The rate constant for the reaction $$\mathrm{A} \rightarrow \mathrm{B}+\mathrm{C}$$ at $$500 \mathrm{~K}$$ is given as $$0.004 \mathrm{~s}^{-1}$$. At what temperature will the rate constant become $$0.014 \mathrm{~s}^{-1}$$ ? $$\mathrm{E}_{\mathrm{a}}$$ for the reaction is $$18.231 \mathrm{~kJ}$$.

A
950 K
B
597 K
C
700 K
D
800 K
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

For the reaction $$\mathrm{Cl}_{2(\mathrm{~g})}+2 \mathrm{NO}_{(\mathrm{g})} \rightarrow 2 \mathrm{NOCl}_{(\mathrm{g})}$$, the following data was obtained:

Experiment No. Initial concentration of $$\mathrm{Cl_2}$$ ($$\mathrm{M}$$) Initial concentration of $$\mathrm{NO}$$ ($$\mathrm{M}$$) Initial reaction rate ($$\mathrm{M}$$/min)
I 0.15 0.15 0.60
II 0.30 0.15 1.20
III 0.15 0.3 2.40
IV 0.25 0.25 2.78

Identify the order of the reaction with respect to $$\mathrm{Cl}_2, \mathrm{NO}$$ and the value of Rate constant.

A
$$ \text { Order with respect to } \mathrm{Cl}_2=2 \quad \text { Order with respect to } \mathrm{NO}=1 \quad \mathrm{k}=355.5 \mathrm{~mol}^{-2} \mathrm{~L}^2 \mathrm{~min}^{-1} $$
B
$$ \text { Order with respect to } \mathrm{Cl}_2=0 \quad \text { Order with respect to } \mathrm{NO}=1 \quad \mathrm{k}=8.0 \mathrm{~min}^{-1} $$
C
$$ \text { Order with respect to } \mathrm{Cl}_2=1 \quad \text { Order with respect to } \mathrm{NO}=2 \quad \mathrm{k}=177.7 \mathrm{~mol}^{-2} \mathrm{~L}^2 \mathrm{~min}^{-1} $$
D
$$ \text { Order with respect to } \mathrm{Cl}_2=1 \quad \text { Order with respect to } \mathrm{NO}=1 \quad \mathrm{k}=26.66 \mathrm{~mol}^{-1} \mathrm{Lmin}^{-1} $$
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Given below are 4 graphs [A], [B], [C] and [D]

COMEDK 2024 Morning Shift Chemistry - Chemical Kinetics Question 11 English

Identify the 2 graphs that represent a Zero order reaction?

A
[A] and [D]
B
[A] and [B]
C
[B] and [C]
D
[C] and [D]
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A given chemical reaction is represented by the following stoichiometric equation.

$$3 X+2 Y+\frac{5}{2} Z \rightarrow P_1+P_2+P_3$$

The rate of reaction can be expressed as _________.

A
$$\frac{2}{3}\left(\frac{d[X]}{d t}\right)=\left(\frac{d[Y]}{d t}\right)=\frac{4}{5}\left(\frac{d[Z]}{d t}\right)$$
B
$$\frac{3}{2}\left(\frac{d[X]}{d t}\right)=\frac{1}{4}\left(\frac{d[Y]}{d t}\right)=\frac{8}{5}\left(\frac{d[Z]}{d t}\right)$$
C
$$\frac{4}{15}\left(\frac{d[X]}{d t}\right)=\frac{4}{5}\left(\frac{d[Y]}{d t}\right)=\frac{8}{15}\left(\frac{d[Z]}{d t}\right)$$
D
$$\left(\frac{d[X]}{d t}\right)=\frac{3}{2}\left(\frac{d[Y]}{d t}\right)=\frac{15}{4}\left(\frac{d[Z]}{d t}\right)$$
COMEDK Subjects