1.Which among the following methods is used for the manufacture of carbon dioxide?
a) From synthesis gas
b) Lime kiln process
c) Monte Catini process
d) Kraft’s process
Explanation: In lime kiln process calcium carbonate is used along with girbotol recovery. Methanol is manufactured from synthesis gas. Kraft’s process is for the manufacture of paper pulp. Ammonium carbonate is manufactured by monte catini process.
2. What is the pressure requirement in the manufacture of methanol from synthesis gas?
a) 1-3 atm
b) 100-150 atm
c) 10atm
d) 200-350atm
Explanation: High pressure is required for the manufacture of methanol. Conversion cannot take place at low pressure as it leads to formation of intermediate compounds.
3. What is the molecular weight of methanol?
a) 32
b) 31
c) 28
d) 34
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.
4. Mercaptans are used in ____________
a) Freon’s
b) Cellophane
c) Paint stripper
d) Odorants
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.
5. Which of the following product is not produced in the side reactions of methanol formation?
a) Methane
b) Oxygen
c) Carbon dioxide
d) Water
Explanation: Side reaction products of catalytic hydrogenation of carbon monoxide to produce methanol are carbon dioxide, water, methane, and high molecular weight compounds.
6. 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
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.
7. Catalytic hydrogenation of carbon monoxide process is similar to ammonia formation in design.
a) True
b) False
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.
8. Reagent used to remove ketones, aldehydes in liquid methanol is _______________
a) Manganate
b) Chromate
c) Di-chromate
d) Per-manganate
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.
9. What is the molecular weight of tri chloro ethylene?
a) 131.5
b) 130.5
c) 129.5
d) 120.5
Explanation:Molecular formula of tri chloro ethylene is ClHC=CCl2. As it contains 3 chlorine atoms, 2 carbon atoms, and 1 hydrogen atom the molecular weight is 35.5*3+12*2+1*1=131.5.
10. Tri chloro ethylene is highly soluble in water. Is the statement true/false?
a) True
b) False
Explanation: Tri chloro ethylene is not highly soluble but slightly soluble in water. It is miscible with ethers and alcohols. It is available in different grades like technical, extraction etc.