Engineering Chemistry Questions and Answers – Order of a Reaction

This set of Engineering Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Order of a Reaction”.

1. Reaction kinetics deals with the study of ___________
a) Rate of reaction
b) Mechanism of reaction
c) Factors which affects the rate of reaction
d) All of the mentioned
View Answer

Answer: d
Explanation: Reaction kinetics deals with the study of rate of reaction, their mechanism and the factors which affects the rate of reaction. It specifies all the general characteristics of a chemical reaction.

2. The reaction rate is defined as the rate at which the concentration of the reactants __________ with time or the concentration of products ___________ with time.
a) Increase, increase
b) Decrease, decrease
c) Decrease, increase
d) Increase, decrease
View Answer

Answer: c
Explanation: The reaction rate is defined as the rate at which the concentration of the reactants decreases with time or the concentration of products increases with time.

3. The unit of rate of reaction is ___________
a) Mol L-1 s-1
b) Mol L s-1
c) Mol L-1 s
d) Mol L s
View Answer

Answer: a
Explanation: The unit of rate of reaction is Mol L-1 s-1. The reaction rate is defined as the rate at which the concentration of the reactants decreases with time or the concentration of products increases with time.
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4. The order of the reaction can be zero, fractional or integer and it is always experimentally determined.
a) True
b) False
View Answer

Answer: a
Explanation: The order of the reaction can be zero, fractional or integer and it is always experimentally determined. The order of reaction with respect to a given substance is defined as the index, or exponent, to which its concentration term in the rate equation is raised.

5. The reaction rate constant may be defined as the rate of the reaction when the concentration of each reactants is ___________
a) Zero
b) Unity
c) Doubled the initial concentration
d) Infinite
View Answer

Answer: b
Explanation: The reaction rate constant may be defined as the rate of the reaction when the concentration of each reactants is unity. A reaction rate constant or reaction rate coefficient, k, quantifies the rate of a chemical reaction.
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6. The unit s-1 is the unit of rate constant for the reaction of the order is?
a) 1
b) 2
c) 0.5
d) 0
View Answer

Answer: d
Explanation: The unit s-1 is the unit of rate constant for the reaction of the order zero. It quantifies the rate of a chemical reaction.

7. The unit of rate constant for the second order reaction will be ___________
a) s-1
b) L mol-1 s-1
c) Mol0.5 L-0.5 s-1
d) Mol L-1 s-1
View Answer

Answer: c
Explanation: The unit of rate constant for the second order reaction will be mol0.5 L-0.5 s-1.
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8. What will be the order of reaction if the rate law is given by ___________
Rate = k [SO2]1 [SO3]-0.5
a) 1
b) 0.5
c) 2
d) -0.5
View Answer

Answer: b
Explanation: The order of the reaction will be 0.5. It is given by:
Order = 1-0.5 = 0.5.

9. Order of a reaction does not give any information about the reaction mechanism.
a) True
b) False
View Answer

Answer: a
Explanation: Order of a reaction does not give any information about the reaction mechanism. It only gives the idea of the reactant species taking part in a reaction.
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10. The unit L mol-1 s-1 is the unit of rate constant for the reaction of the order is?
a) 0
b) 1
c) 0.5
d) 2
View Answer

Answer: c
Explanation: The unit L mol-1 s-1 is the unit of rate constant for the reaction of the order 0.5. This is a half-order reaction.

Sanfoundry Global Education & Learning Series – Engineering Chemistry.

To practice all areas of Engineering Chemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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