Engineering Questions with Answers - Multiple Choice Questions
Chemical Technology MCQ’s – C1 Compounds – Methanol
1 - Question
What is the molecular weight of methanol?
a) 32
b) 31
c) 28
d) 34
View Answer
Explanation: Molecular formula of methane is CH3OH. It has 3 Carbon atoms, 4 hydrogen atoms, and 1 oxygen atom; hence the molecular weight of methanol is 12*1+4*1+16*1=32.
2 - Question
Mercaptans are used in ____________
a) Freon’s
b) Cellophane
c) Paint stripper
d) Odorants
View Answer
Explanation: Generally Mercaptans are used in odorants and soil fumigants. Carbon disulfide is used in cellophane. Methylene chloride is used in paint stripper and Freon’s.
3 - Question
Which of the following product is not produced in the side reactions of methanol formation?
a) Methane
b) Oxygen
c) Carbon dioxide
d) Water
View Answer
Explanation: Side reaction products of catalytic hydrogenation of carbon monoxide to produce methanol are carbon dioxide, water, methane, and high molecular weight compounds.
4 - Question
What is the mole ratio of hydrogen to carbon dioxide in the process of catalytic hydrogenation of carbon monoxide?
a) 1.25
b) 2.25
c) 3.25
d) 4.25
View Answer
Explanation: Mole ratio of hydrogen to carbon dioxide is 2.25. The presence of excess hydrogen is to prevent catalyst fouling with high molecular weight compounds that adsorbs on catalyst.
5 - Question
Catalytic hydrogenation of carbon monoxide process is similar to ammonia formation in design
a) True
b) False
View Answer
Explanation: The statement is true as both (exothermic reactions) have unfavorable equilibrium constants under normal pressure. Reactor must be made up of steel lined with copper to prevent iron carbonyl formation which poisons the catalyst.
6 - Question
Reagent used to remove ketones, aldehydes in liquid methanol is _______________
a) Manganate
b) Chromate
c) Di-chromate
d) Per-manganate
View Answer
Explanation: Per-manganate is used to remove ketones, aldehydes from depressurized liquid methanol and light ends are removed by sending to stripper. High molecular weight compounds are separated by fractionation.