Explore topic-wise MCQs in Chemistry.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.

1.

If the chemical reaction is: aA + bB cC + dD and K is the equilibrium constant. Then what is the equilibrium constant of the reaction naA + nbB ncC + ndD?

A. K
B. nK
C. K<sup>n</sup>
D. K/n
Answer» D. K/n
Discussion
2.

Given that at 800k the concentrations are as follows: N2=3.0 10 3M, O2 = 4.2 10 3M and NO = 2.8 10 3M, what is the equilibrium constant for the reaction N2(g) + O2(g) ( rightleftharpoons ) 2NO(g)?

A. 0.622
B. 0.6
C. 0.63
D. 0.94
Answer» B. 0.6
Discussion
3.

for the reaction H2(g) + Br2(g) 2HBr(g) the equilibrium constant is given as 0.04 then what is the equilibrium constant for the reaction 2HBr(g) H2(g) + Br2(g)?

A. 0.04
B. 4
C. 25
D. 100
Answer» D. 100
Discussion
4.

What is the equilibrium constant of the following reaction: 4NH3 + 5O2 4NO + 6H2O?

A. [NO][H<sub>2</sub>O]/[NH<sub>3</sub>][O<sub>2</sub>]
B. [C]<sup>c</sup>[D]<sup>d</sup>/[A]<sup>a</sup>[B]<sup>b</sup>
C. [NO<sub>4</sub>[H<sub>2</sub>]<sup>6</sup>/NH<sub>3</sub>]<sup>4</sup>[O<sub>2</sub>]<sup>5</sup>
D. [NO]<sup>4</sup>[H<sub>2</sub>O]<sup>6</sup>/[NH<sub>3</sub>]<sup>4</sup>[O<sub>2</sub>]<sup>5</sup>
Answer» E.
Discussion
5.

If we use activities in place of molar concentration in an equilibrium constant expression then what is the dimension of k?

A. it becomes dimensionless
B. the same units of molar concentration
C. units are related to the activity
D. cannot predict it
Answer» B. the same units of molar concentration
Discussion
6.

If the initial concentrations of reactants in a reaction increase then the equilibrium constant ____________

A. also increases
B. decreases
C. remains constant
D. may increase or decrease
Answer» D. may increase or decrease
Discussion
7.

The equilibrium constant of a reaction is 20 units and the equilibrium constant of other reaction is 30 units when both the reactions are added up together then the equilibrium constant of the resultant reaction is given by _____________

A. 20 units
B. 600 units
C. 50 units
D. 10 units
Answer» C. 50 units
Discussion
8.

What does it indicate having a higher equilibrium constant?

A. reaction occurs faster
B. rate of backward reaction is faster
C. both the backward and forward reactions are equal
D. reaction may be slower than usual
Answer» B. rate of backward reaction is faster
Discussion
9.

The value of equilibrium constant for different chemical reactions at a particular temperature is ____________

A. constant
B. unique
C. the same
D. cannot say
Answer» C. the same
Discussion
10.

A reaction is given by aA + bB cC + dD. How do you represent an equilibrium constant?

A. [A]<sup>a</sup>[B]<sup>b</sup>/[C]<sup>c</sup>[D]<sup>d</sup>
B. [C]<sup>c</sup>[D]<sup>d</sup>/[A]<sup>a</sup>[B]<sup>b</sup>
C. [A][B]/[C][D]
D. [C][D]/[A][B]
Answer» C. [A][B]/[C][D]
Discussion