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1.

Which of the mentioned equipment is used to store volatile components to prevent vapor losses.(a) Pressurized Spheres(b) Tanks(c) Gas holders(d) Underground cavernsI had been asked this question in unit test.My query is from Unit Operations in chapter Unit Operations and Unit Process of Chemical Technology

Answer»

The correct answer is (a) Pressurized Spheres

For explanation: VOLATILE components EXERT VAPOR pressure and tend to vaporize with EASE, to prevent this we need to exert pressure on them. THEREFORE, pressurized spheres are used.
Discussion
2.

Drying can be characterized as which of the mentioned?(a) Unit process(b) Unit operation(c) Unit process and Unit operation(d) None of the mentionedThe question was asked in examination.This interesting question is from Unit Operations in portion Unit Operations and Unit Process of Chemical Technology

Answer»

Correct CHOICE is (B) Unit operation

Easiest EXPLANATION: Drying involves removal of moisture which doesn’t undergo any chemical CHANGES.
Discussion
3.

Dyeing industry uses which of the mentioned process?(a) Diazotization and coupling(b) Hydroxylation(c) Oligomerization(d) PyrolsisI had been asked this question in an online quiz.Origin of the question is Unit Process topic in section Unit Operations and Unit Process of Chemical Technology

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The correct OPTION is (a) DIAZOTIZATION and COUPLING

Explanation: Most of the dyeing INDUSTRIES involve diazotization and coupling of organic compounds to PRODUCE dyes like rosaniline etc.
Discussion
4.

Which of the mentioned come under size reduction equipment?(a) Ball mill(b) Roll crusher(c) Jaw Crusher(d) All the mentionedThis question was addressed to me in an online quiz.Asked question is from Unit Operations in division Unit Operations and Unit Process of Chemical Technology

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The CORRECT OPTION is (d) All the mentioned

The best explanation: All the EQUIPMENT mentioned USES crushing to reduces the size.
Discussion
5.

Which of the following description is apt for hydrolysis?(a) Addition of water molecule(b) Splitting of substance using water molecule(c) Removal of water(d) Removal of electronsThe question was asked in semester exam.Query is from Unit Process topic in division Unit Operations and Unit Process of Chemical Technology

Answer»

The CORRECT ANSWER is (b) Splitting of substance using water molecule

The BEST I can explain: Hydrolysis is splitting of a COMPOUND using water molecule.
Discussion
6.

Calcination is used primarily in which of the following industry?(a) Petroleum(b) Textile(c) Paper(d) CementThe question was posed to me in examination.Origin of the question is Unit Process in section Unit Operations and Unit Process of Chemical Technology

Answer» RIGHT answer is (d) CEMENT

Best EXPLANATION: CALCINATION is reaction in which limestone when heated gives CO2 and lime (CaO). Therefore, it is primarily USED to cement industry.
Discussion
7.

Ca(OH)2 + H2SO4 → CaSO4 + 2H2O is which type of reaction?(a) Replacement(b) Decomposition(c) Addition(d) Double decompositionI have been asked this question during a job interview.Origin of the question is Unit Process topic in section Unit Operations and Unit Process of Chemical Technology

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The correct OPTION is (d) Double DECOMPOSITION

The EXPLANATION is: Any REACTION of the formAB + CD → AD + CBIS said to be double decomposition.
Discussion
8.

Cyclone separator is used to separate which of the mentioned?(a) Solids particle from liquid(b) Liquids particles from liquid(c) Solid and liquid particles from gases(d) Solids from gases onlyThe question was posed to me during an internship interview.Asked question is from Unit Operations in section Unit Operations and Unit Process of Chemical Technology

Answer»

Correct OPTION is (c) Solid and liquid PARTICLES from gases

The explanation is: Cyclone separator is USED to separate solids particles and liquid DROPLETS from the gas flow to purify it/prevent air pollution etc.
Discussion
9.

Into which of the mentioned options can be evaporation be considered?(a) Boiling(b) Removal of water(c) Process of concentrating(d) DryingI got this question in my homework.The origin of the question is Unit Operations topic in section Unit Operations and Unit Process of Chemical Technology

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Correct OPTION is (c) Process of concentrating

Easy explanation: Evaporation OCCURS with COMPONENTS like acetone too, so ‘Process of concentrating’ is ELIMINATED. Boiling needs high temperatures but evaporation occurs at ordinary temperature too. Drying is removal of moisture. Therefore, the BEST option is ‘Process of concentrating’.
Discussion
10.

Which of the mentioned is a unit operation?(a) Polymerization(b) Steam reforming(c) Catalytic cracking(d) DistillationThis question was addressed to me at a job interview.This interesting question is from Unit Operations topic in section Unit Operations and Unit Process of Chemical Technology

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Correct CHOICE is (d) Distillation

For explanation: Distillation is a process of SEPARATION of MISCIBLE liquids on basis of their difference in vapor pressures, which involves no chemical reactions whereas the rest INVOLVE chemical changes.
Discussion
11.

The reaction CaO + H2O → CH3CH2OH is an example of ________(a) Hydration(b) Dehydration(c) Hydrogenation(d) DehydrogenationI have been asked this question in an interview.Origin of the question is Unit Process topic in division Unit Operations and Unit Process of Chemical Technology

Answer»

Right OPTION is (a) Hydration

Explanation: In the reaction ONE MOLE of WATER is being ADDED to the reactant, Therefore it is hydration.
Discussion
12.

Unit process involves changes in which of the mentioned?(a) Physical changes(b) Chemical Changes(c) Both Physical and chemical changes(d) None of the mentionedThe question was posed to me at a job interview.I need to ask this question from Unit Process in chapter Unit Operations and Unit Process of Chemical Technology

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The CORRECT option is (B) Chemical Changes

To explain I would SAY: Any PROCESS which INVOLVES chemical changes is a unit process.
Discussion
13.

Unit operations involve change in which of the mentioned?(a) Chemical Changes(b) Physical Changes(c) Chemical and physical Changes(d) No changeI had been asked this question in my homework.I need to ask this question from Unit Operations topic in portion Unit Operations and Unit Process of Chemical Technology

Answer» CORRECT CHOICE is (b) Physical CHANGES

Explanation: Any operation that brings physical changes of the component is a unit operation.
Discussion
14.

Which of the mentioned is an example of Unit process?(a) Melting of ice(b) Boiling of water(c) Boiling of egg(d) Cooling of waterThis question was addressed to me in homework.My question is taken from Unit Process topic in division Unit Operations and Unit Process of Chemical Technology

Answer» RIGHT answer is (c) BOILING of EGG

Best explanation: Boiling of egg results in the hardening of the egg yolk and is IRREVERSIBLE change.
Discussion
15.

Isomerization is mostly used in which of the mentioned industries?(a) Petroleum(b) Soap(c) Pharmaceuticals(d) FertilizerI have been asked this question by my school teacher while I was bunking the class.Origin of the question is Unit Process in portion Unit Operations and Unit Process of Chemical Technology

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The correct answer is (a) Petroleum

The BEST I can EXPLAIN: ISOMERIZATION is a process in which long chain are reacted and then branched which IMPROVES octane no. of FUEL.
Discussion
16.

Which of the mentioned come under Unit process?(a) Hydrolysis(b) Isomerization(c) Esterification(d) All the mentionedThe question was posed to me in an interview for internship.My question is based upon Unit Process topic in section Unit Operations and Unit Process of Chemical Technology

Answer» RIGHT ANSWER is (d) All the MENTIONED

To elaborate: The given options all involve chemical REACTION i.e making and breaking of bonds. Therefore, all of them mentioned are UNIT processes.
Discussion
17.

Extraction comes under which of the mentioned?(a) Unit operation(b) Unit process(c) None of the mentioned(d) Unit process and Unit OperationI have been asked this question in an internship interview.My doubt is from Unit Operations topic in portion Unit Operations and Unit Process of Chemical Technology

Answer»

The correct ANSWER is (a) Unit operation

Explanation: Removal of ONE component from a solution using another solvent is liquid-liquid EXTRACTION, Solvent should be selected in such a WAY that its not reactive. Therefore, no chemical reaction OCCURS.
Discussion
18.

Combustion falls under which of the below mentioned?(a) Unit process(b) Unit operation(c) Both unit operation and process(d) None of the mentionedI got this question during an online exam.The question is from Unit Process in division Unit Operations and Unit Process of Chemical Technology

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The correct answer is (a) Unit process

To elaborate: COMBUSTION is BURNING of substance in the presence of OXYGEN in which chemical REACTION OCCURS.
Discussion
19.

Which of the following operation uses gravity?(a) Decantation(b) Sedimentation(c) Settling(d) All the mentionedI had been asked this question during an online interview.Origin of the question is Unit Operations topic in portion Unit Operations and Unit Process of Chemical Technology

Answer» CORRECT answer is (d) All the mentioned

Explanation: All the GIVEN operations occur due to the size of the particles BASED on their weight where the principle of GRAVITY is involved.
Discussion