MCQOPTIONS

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.

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>

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.

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

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]

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>

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>

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>

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

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>