Engineering Questions with Answers - Multiple Choice Questions
Chemical Technology MCQ’s – C2 Compounds – Ethanol
1 - Question
Which enzyme is used to hydrolyse starch to maltose to manufacture ethanol by fermentation?
Explanation: Diastase catalyses the breakdown of starch into maltose. Lipase is an enzyme that catalyses the hydrolysis of lipids. Amylase breaks down complex carbohydrates to starch.
2 - Question
Which among the following methods cannot be used for the manufacture of ethanol?
a) From fermentation of molasses
b) From lignocelluloses biomass
c) Catalytic hydrogenation of ethylene
d) From microorganisms
Explanation: Ethanol cannot be derived from microorganisms. The most widely used method for the manufacture of ethanol is from fermentation of molasses.
3 - Question
What is mash made up of in the manufacture of ethanol from molasses?
a) Ammonium nitrate + Magnesium nitrate
b) Ammonium nitrate + Magnesium nitrate + Phosphorous
c) Ammonium sulphate + Magnesium sulphate
d) Ammonium sulphate + Magnesium sulphate + Phosphorous
Explanation: Nutrients such as Ammonium sulphate, Magnesium sulphate and Phosphorous are added to molasses to support the yeast growth.
4 - Question
Denatured ethanol is safe for drinking.
Explanation: Denatured alcohol consists many additives which are harmful to the human body, such as methanol. So denatured ethanol is not safe for human consumption.
5 - Question
The pH of molasses solution in the manufacture of ethanol should be __________
Explanation: The pH of the molasses solution must be in the range of 4-5 to support yeast growth which furnishes invertase and zymase. pH is adjusted by adding sulfuric acid.