Engineering Questions with Answers - Multiple Choice Questions

# Unit Processes MCQ’s – Types of Reactions

1 - Question

What is order of reaction?
a) The sum if exponents of concentration
b) Product of exponents of concentration
c) The difference of exponents of concentration
d) None of the mentioned
Explanation: In a homogeneous reaction, the order of reaction is the sum of the exponents of concentration of reaction.

2 - Question

What is (-dCa/dt) =kCa2 ?
a) Third order reaction
b) First order reaction
c) Second Order reaction
d) Fourth Order reaction
Explanation: In a chemical reaction the rate equation of the reaction is written in the following form: (-dCa/dt) =kCa2.

3 - Question

In a chemical reaction, the rate of reaction is independent of the reactant concentration, what is it called what?
a) Zero order reaction
b) First order reaction
c) Second Order reaction
d) None of the mentioned
Explanation: In zero order reaction, the rate of reaction is independent of the reactant concentration where as in other reactions the rate of reaction depends on the reactant concentration.

4 - Question

How many reactions take place in a Simple reaction?
a) Zero reactions
b) One reaction
c) Two reactions
d) Simultaneous reactions
Explanation: In a simple reaction, only one reaction is considered, therefore it is called simple.

5 - Question

How many phases are there in Homogeneous reaction?
a) Does not depend on phases
b) Single phases
c) Multiple phases
d) Gaseous phases
Explanation: Homogeneous reaction is the reaction taking place in only one phases whereas heterogeneous has many phases.

6 - Question

What do you mean by Isothermal reactions?
a) Constant pressure
b) Constant Energy
c) Constant heat
d) Constant temperature
Explanation: Isothermal is a reaction in which no change in temperature takes place i.e both are at same temperature.

7 - Question

What does ‘n’ denote in a rate of reaction?
a) No of phases
b) Order of reaction
c) Order of concentration
d) None of the mentioned
Explanation: In a rate of reaction the order of reaction is denoted by ‘n’ in the rate equation.

8 - Question

How many products are formed in a Parallel reaction?
a) Zero products
b) One product
c) Many products
d) Depends on reaction
Explanation: As in parallel reactions more than one products are formed due to separate reactions which happens simultaneously. In series only one product is formed.

9 - Question

What happens during reversible reactions?
a) Both forward and backward happens simultaneously
b) Only forward reaction
c) Only backward reaction
d) No reaction take place
Explanation: During reversible reaction forward and reverse reaction takes place simultaneously. H2 + O2 2H2O.

10 - Question

What is the reaction in which more than one phases are involved?
a) Homogeneous reaction
b) Heterogeneous reaction
c) Catalytic reaction
d) Non catalytic reaction