Explore topic-wise MCQs in Engineering Chemistry.

This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Chemistry knowledge and support exam preparation. Choose a topic below to get started.

1.

Threshold energy is the sum of ___________

A. Internal energy and external energy of reactants
B. Activation energy and external energy of reactants
C. Activation energy and internal energy of reactants
D. Activation energy and thermal energy
Answer» D. Activation energy and thermal energy
Discussion
2.

In a series of reactions, the rate determining step is ___________

A. Simplest
B. Fast and complex
C. Fastest
D. Slowest
Answer» E.
Discussion
3.

For a certain reaction, the rate = k[NO]2[O2], when the initial concentration of NO is tripled, the initial rate ___________

A. Increases by a factor of nine
B. Increases by a factor of three
C. Increases by a factor of six
D. Decreases by a factor of nine
Answer» B. Increases by a factor of three
Discussion
4.

Based on the collision model, the atoms at the top of the potential energy hill are called ___________

A. Transition state
B. Energetic atom
C. Steric factor
D. Activation energy
Answer» B. Energetic atom
Discussion
5.

Which concentration plot is linear for a first order reaction? (A is one of the reactant)

A. [A] versus time
B. [A]2 versus time
C. Ln[A] versus time
D. √[A] versus time
Answer» D. √[A] versus time
Discussion
6.

Threshold energy is the sum o?
A. Internal energy and external energy of reactants
B. Activation energy and external energy of reactants
C. Activation energy and internal energy of reactants
D. Activation energy and thermal energy
Answer» D. Activation energy and thermal energy
Discussion
7.

In a series of reactions, the rate determining step is

A. Simplest
B. Fast and complex
C. Fastest
D. Slowest
Answer» E.
Discussion
8.

For a certain reaction, the rate = k[NO]2[O2], when the initial concentration of NO is tripled, the initial rate

A. Increases by a factor of nine
B. Increases by a factor of three
C. Increases by a factor of six
D. Decreases by a factor of nine
Answer» B. Increases by a factor of three
Discussion
9.

What does termolecular refer to?

A. 2 molecules colliding
B. 3 molecules colliding
C. 4 molecules colliding
D. 5 molecules colliding
Answer» C. 4 molecules colliding
Discussion
10.

Based on the collision model, the atoms at the top of the potential energy hill are called

A. Transition state
B. Energetic atom
C. Steric factor
D. Activation energy
Answer» B. Energetic atom
Discussion
11.

Which concentration plot is linear for a first order reaction? ( A is one of the reactant)

A. [A] versus time
B. [A]<sup>2</sup> versus time
C. Ln[A] versus time
D. ‚àö[A] versus time
Answer» D. ‚Äö√Ñ√∂‚àö‚Ć‚àö‚àÇ[A] versus time
Discussion
12.

Which of the following is an example of pseudo first order reaction?

A. Saponification of ester
B. Oxidation of hydrogen bromide
C. Gaseous decomposition of hydrogen iodide
D. Inversion of cane sugar
Answer» E.
Discussion
13.

Reactions which are bimolecular yet following ___________ order kinetics are called pseudo unimolecular reaction.

A. Zero
B. First
C. Second
D. Third
Answer» C. Second
Discussion