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1.

What is the other name of series reaction?(a) Complex reaction(b) Parallel reaction(c) Consecutive reaction(d) None of the mentionedI have been asked this question during an interview.The above asked question is from Reactions in division Chemical Process Kinetics of Unit Processes

Answer» CORRECT CHOICE is (c) CONSECUTIVE reaction

Best explanation: The other NAME of Series reaction is Consecutive reaction.
Discussion
2.

What %cent age back mixing takes place in a Stirred tank reactor?(a) 100%(b) 75%(c) 50%(d) 0%I had been asked this question in exam.I'm obligated to ask this question of Reactions in portion Chemical Process Kinetics of Unit Processes

Answer»

Right option is (a) 100%

The best I can EXPLAIN: Only in a Stirred tank reactor we get 100% BACK MIXING. Hence is has a very low yield.
Discussion
3.

Which tower has a horizontal tank, with low ratio of length to diameter?(a) Baffled tank reactor(b) Tower reactor(c) Longitudinal reactor(d) All of the mentionedThe question was asked in quiz.My query is from Reactions in chapter Chemical Process Kinetics of Unit Processes

Answer» CORRECT option is (a) Baffled tank reactor

Explanation: Only baffled tank has a LOW length to diameter ratio, and is HORIZONTAL in SHAPE.
Discussion
4.

Which reactor has zero back mixing?(a) Tubular reactor(b) Longitudinal reactor(c) Semi batch reactor(d) All of the mentionedThe question was posed to me during an online interview.This key question is from Reactions in section Chemical Process Kinetics of Unit Processes

Answer»

Correct answer is (B) Longitudinal reactor

Easiest EXPLANATION: Explanation: Only longitudinal reactor has zero BACK mixing as the reaction takes place only in one direction and not laterally.
Discussion
5.

When a large volume is there, what type of reactor is used?(a) Tubular reactor(b) Simple batch reactor(c) Semi batch reactor(d) Tower reactorThe question was asked during an interview.This interesting question is from Reactions in chapter Chemical Process Kinetics of Unit Processes

Answer»

Correct option is (d) Tower reactor

To ELABORATE: Whenever a LARGE volume is there for reaction we USE tower reactor. It further consists of empty, packed and baffled tower REACTORS.
Discussion
6.

In which reactor one reactant is feed and other reactant is added continuously?(a) Simple batch reactor(b) Semi batch reactor(c) Continuous homogeneous reactor(d) Continuous heterogeneous reactorI got this question at a job interview.The doubt is from Reactions topic in division Chemical Process Kinetics of Unit Processes

Answer»

The correct option is (b) SEMI batch reactor

To explain I WOULD SAY: In Semi batch reactor, it is a type of reactor in which one reactant is ALREADY ADDED and another one is continuously added.
Discussion
7.

How many types of reactors are there?(a) 2(b) 3(c) 4(d) Many numberI have been asked this question during a job interview.I want to ask this question from Reactions in section Chemical Process Kinetics of Unit Processes

Answer»

The correct choice is (C) 4

The BEST I can explain: There are 4 types of reactors: SIMPLE batch homogeneous, semi batch, Continuous homogeneous and continuous heterogeneous reactors.
Discussion
8.

Back mixing can occur only in _________ in a chemical process.(a) Stagnant reaction(b) Flow reaction(c) Both the reactions(d) Does not depend on itThe question was asked in my homework.Query is from Reactions topic in chapter Chemical Process Kinetics of Unit Processes

Answer» RIGHT choice is (b) FLOW reaction

The best I can explain: BACK mixing is the mixing of reactants and products due to flow reaction. It happens in horizontal direction and it reduces the product quality.
Discussion
9.

How many products are formed in a Parallel reaction?(a) Zero products(b) One product(c) Many products(d) Depends on reactionI have been asked this question in an online quiz.Origin of the question is Types of Reactions topic in portion Chemical Process Kinetics of Unit Processes

Answer»

The correct CHOICE is (c) Many PRODUCTS

Best 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.
Discussion
10.

What happens during reversible reactions?(a) Both forward and backward happens simultaneously(b) Only forward reaction(c) Only backward reaction(d) No reaction take placeThis question was posed to me during an interview.The question is from Types of Reactions topic in portion Chemical Process Kinetics of Unit Processes

Answer» CORRECT option is (a) Both FORWARD and backward happens simultaneously

To explain: During reversible REACTION forward and reverse reaction takes PLACE simultaneously.

H2 + O22H2O.
Discussion
11.

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 mentionedThis question was posed to me in unit test.My question is from Types of Reactions in section Chemical Process Kinetics of Unit Processes

Answer»

Right answer is (b) Order of REACTION

Explanation: In a RATE of reaction the order of reaction is denoted by ‘N’ in the rate EQUATION.
Discussion
12.

What do you mean by Isothermal reactions?(a) Constant pressure(b) Constant Energy(c) Constant heat(d) Constant temperatureI have been asked this question during an interview.I want to ask this question from Types of Reactions topic in chapter Chemical Process Kinetics of Unit Processes

Answer»

Correct OPTION is (d) Constant TEMPERATURE

The BEST I can EXPLAIN: ISOTHERMAL is a reaction in which no change in temperature takes place i.e both are at same temperature.
Discussion
13.

How many phases are there in Homogeneous reaction?(a) Does not depend on phases(b) Single phases(c) Multiple phases(d) Gaseous phasesI had been asked this question by my school principal while I was bunking the class.I would like to ask this question from Types of Reactions in division Chemical Process Kinetics of Unit Processes

Answer»

Correct option is (B) Single phases

Easy EXPLANATION: Homogeneous REACTION is the reaction taking PLACE in only one phases whereas heterogeneous has MANY phases.
Discussion
14.

How many reactions take place in a Simple reaction?(a) Zero reactions(b) One reaction(c) Two reactions(d) Simultaneous reactionsI got this question during an interview.This is a very interesting question from Types of Reactions topic in section Chemical Process Kinetics of Unit Processes

Answer»

Correct CHOICE is (b) One reaction

To explain I would SAY: Explanation: In a simple reaction, only one reaction is CONSIDERED, therefore it is CALLED simple.
Discussion
15.

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 mentionedThis question was posed to me during an online exam.The origin of the question is Types of Reactions in division Chemical Process Kinetics of Unit Processes

Answer»

The correct CHOICE is (a) Zero order reaction

To explain: 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.
Discussion
16.

What is (-dCa/dt) =kCa^2 ?(a) Third order reaction(b) First order reaction(c) Second Order reaction(d) Fourth Order reactionThis question was posed to me in exam.This interesting question is from Types of Reactions in chapter Chemical Process Kinetics of Unit Processes

Answer» RIGHT option is (c) SECOND Order REACTION

The explanation is: In a chemical reaction the rate EQUATION of the reaction is written in the following FORM: (-dCa/dt) =kCa^2.
Discussion
17.

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 mentionedI got this question during an online interview.My enquiry is from Types of Reactions in portion Chemical Process Kinetics of Unit Processes

Answer»

The correct ANSWER is (a) The SUM if exponents of CONCENTRATION

To explain: In a homogeneous REACTION, the order of reaction is the sum of the exponents of concentration of reaction.
Discussion