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

$$\mathrm{S}_8$$ on heating at a temperature above $$1000 \mathrm{~K}$$, changes to $$\mathrm{S}_2$$. When 1 mole of $$\mathrm{S}_8$$ is heated above $$1000 \mathrm{~K}$$, the pressure falls by $$32 \%$$ at equilibrium. The equilibrium constant for the conversion is:

A
$$4.50 \mathrm{~atm}^3$$
B
$$2.55 \mathrm{~atm}^3$$
C
$$3.20 \mathrm{~atm}^3$$
D
$$3.94 \mathrm{~atm}^3$$
2
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Consider the following equilibrium,

$$\begin{aligned} & 2 \mathrm{No}(g) \rightleftharpoons \mathrm{N}_2+\mathrm{O}_2 ; \mathrm{K}_{\mathrm{G}}=2.4 \times 10^{20} \\ & \mathrm{No}(\mathrm{g})+\frac{1}{2} \mathrm{Br}_2(\mathrm{~g}) \rightleftharpoons \mathrm{NoBr}(\mathrm{g}) ; \mathrm{K}_{\mathrm{C}_2}=1.4 \end{aligned}$$

Calculate $$K_C$$ for the reaction,

$$\frac{1}{2} \mathrm{~N}_2(g)+\frac{1}{2} \mathrm{O}_2(g)+\frac{1}{2} \mathrm{Br}_2(g) \rightleftharpoons \mathrm{NOBr}(g)$$

A
$$8.96 \times 10^{-11}$$
B
$$9.48 \times 10^{-9}$$
C
$$8.08 \times 10^{-12}$$
D
$$8.96 \times 10^{11}$$
3
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The equilibrium constants for the reactions $$a, b$$, and $$c$$ are as given:

a) $$\mathrm{N}_2+3 \mathrm{H}_2=2 \mathrm{NH}_3: \mathbf{K}_1$$

b) $$\mathrm{N}_2+\mathrm{O}_2=2 \mathrm{NO}: \mathrm{K}_2$$

c) $$2 \mathrm{H}_2+\mathrm{O}_2=2 \mathrm{H}_2 \mathrm{O}: \mathbf{K}_3$$

What would be the Equilibrium constant for the reaction:

$$4 \mathrm{NH}_3+5 \mathrm{O}_2=4 \mathrm{NO}+6 \mathrm{H}_2 \mathrm{O} ; \mathbf{K}_{\mathbf{x}}$$

A
$$ \mathbf{K}_{\mathbf{x}}=\mathrm{K}_2{ }^2 \mathrm{~K}_3{ }^3 / \mathrm{K}_1{ }^2 $$
B
$$ \mathbf{K}_{\mathbf{x}}=\mathrm{K}_1 / \mathrm{K}_2 \mathrm{~K}_3 $$
C
$$ \mathbf{K}_{\mathbf{x}}=1 / \mathbf{K}_1{ }^2+\mathbf{K}_2{ }^2+\mathrm{K}_3{ }^3 $$
D
$$ \mathbf{K}_{\mathbf{x}}=\mathrm{K}_1{ }^2 / \mathrm{K}_2 \mathrm{~K}_3{ }^3 $$
4
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

For the reaction, H$$_2$$(g) + I$$_2$$(g) $$\rightleftharpoons$$ 2HI(g) the position of equilibrium can be shifted to the right by

A
addition of Hi
B
addition of both I$$_2$$ and HI
C
increasing temperature
D
addition of I$$_2$$
COMEDK Subjects