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.

The rate law for the reaction involved in inversion of cane sugar is R=k [C12H22O11] [H2O].

A. True
B. False
Answer» C.
Discussion
2.

What is the rate law for the reaction C2H4 + I2 C2H4I2?

A. R= [C<sub>2</sub>H<sub>4</sub>] [I<sub>2</sub>]<sup>3/2</sup>
B. R= [C<sub>2</sub>H<sub>4</sub>] [I<sub>2</sub>]<sup>3</sup>
C. R= [C<sub>2</sub>H<sub>4</sub>] [I<sub>2</sub>]<sup>2</sup>
D. R= [C<sub>2</sub>H<sub>4</sub>] [I<sub>2</sub>]
Answer» B. R= [C<sub>2</sub>H<sub>4</sub>] [I<sub>2</sub>]<sup>3</sup>
Discussion
3.

How many times will the rate of the elementary reaction 3X + Y X2Y change if the concentration of the substance X is doubled and that of Y is halved?

A. r<sub>2</sub>= 4.5r<sub>1</sub>
B. r<sub>2</sub>= 5r<sub>1</sub>
C. r<sub>2</sub>= 2r<sub>1</sub>
D. r<sub>2</sub>= 4r<sub>1</sub>
Answer» E.
Discussion
4.

What is the concentration of the reactant in a first order reaction when the rate of the reaction is 0.6 s-1 and the rate constant is 0.035?

A. 26.667 M
B. 17.143 M
C. 26.183 M
D. 17.667 M
Answer» C. 26.183 M
Discussion
5.

What is the rate law for acid hydrolysis of an ester such as CH3COOC2H5 in aqueous solution?

A. k [CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub>]
B. k [CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub>] [H<sub>2</sub>O]
C. k [CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub>]<sup>2</sup>
D. k
Answer» B. k [CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub>] [H<sub>2</sub>O]
Discussion
6.

For the reaction A + H2O products, find the rate of the reaction when [A] = 0.75 M, k= 0.02.

A. 0.077 s<sup>-1</sup>
B. 0.085 s<sup>-1</sup>
C. 0.015 s<sup>-1</sup>
D. 0.026 s<sup>-1</sup>
Answer» D. 0.026 s<sup>-1</sup>
Discussion
7.

The reaction NO2 + CO NO + CO2 takes place in two steps. Find the rate law.2NO2 NO + NO3 (k1) slow

A. nNO<sub>3</sub> + CO CO<sub>2</sub> + NO<sub>2</sub> (k<sub>2</sub>) fast
B. R = k<sub>1</sub> [NO<sub>2</sub>]<sup>3</sup>
C. R = k<sub>2</sub> [NO<sub>3</sub>] [CO]
D. R = k<sub>1</sub> [NO<sub>2</sub>]
E. R = k<sub>1</sub> [NO<sub>2</sub>]<sup>2</sup>
Answer» E. R = k<sub>1</sub> [NO<sub>2</sub>]<sup>2</sup>
Discussion
8.

For a reaction A +B C, the experimental rate law is found to be R=k[A]1[B]1/2. Find the rate of the reaction when [A] = 0.5 M, [B] = 0.1 M and k=0.03.

A. 4.74 10<sup>-2</sup> (L/mol)<sup>1/2</sup> s<sup>-1</sup>
B. 5.38 10<sup>-2</sup> (L/mol)<sup>1/2</sup> s<sup>-1</sup>
C. 5.748 10<sup>-2</sup> (L/mol)<sup>1/2</sup> s<sup>-1</sup>
D. 4.86 10<sup>-2</sup> (L/mol)<sup>1/2</sup> s<sup>-1</sup>
Answer» B. 5.38 10<sup>-2</sup> (L/mol)<sup>1/2</sup> s<sup>-1</sup>
Discussion
9.

The rate constant of a reaction is k=3.28 10-4 s-1. Find the order of the reaction.

A. Zero order
B. First order
C. Second order
D. Third order
Answer» C. Second order
Discussion
10.

For a second-order reaction, what is the unit of the rate of the reaction?

A. s<sup>-1</sup>
B. mol L<sup>-1</sup>s<sup>-1</sup>
C. mol<sup>-1</sup> L s<sup>-1</sup>
D. mol<sup>-2</sup> L<sup>2</sup> s<sup>-1</sup>
Answer» D. mol<sup>-2</sup> L<sup>2</sup> s<sup>-1</sup>
Discussion