set 3 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on organic chemistry topic of general science mcq
(a) CnH2n–2
(b) CnH2n
(c) CnH2n+2
(d) CnHn
The correct answers to the above question in:
Answer: (a)
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Question : 1
Addition of ethylene dibromide to petrol
a) helps elimination of lead oxide
b) removes the sulphur compound in petrol
c) increases the octane number of fuel
d) serves as a substitute of tetraethyl lead
Answer »Answer: (d)
Question : 2
Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?
a) Oxygen, calcium, phosphorus
b) Hydrogen, oxygen, sodium
c) Carbon, hydrogen, nitrogen
d) Carbon, hydrogen, potassium
Answer »Answer: (c)
Carbon, hydrogen and nitrogen were primarily responsible for the origin of life on the earth.
Question : 3
The main constituent of Vinegar is:
a) Ascorbic acid
b) Citric acid
c) Acetic acid
d) Tartaric acid
Answer »Answer: (c)
Question : 4
Hydrogenation of oils involves
- saturation of unsaturated fatty acids
- reaction with hydrogen in presence of nickel
- conversion into saturated fatty acids
- driving off the impurities in oil by hydrogen gas
a) 2, 3 and 4
b) 1, 2 and 3
c) 1, 2 and 4
d) 1, 3 and 4
Answer »Answer: (b)
Oils (generally liquid) are glycerides with a larger proportion of unsaturated fatty acids than fats (generally solid or semisolid).
Hence oils, when treated with hydrogen in presence of finely divided nickel as a catalyst, add hydrogen across the carbon-carbon double bonds of the unsaturated acid components to form saturated glycerides which are solid at room temperature.
Question : 5
The functional group present in CH3COOC2H5 is
a) ester
b) aldehydic
c) ketonic
d) carboxylic
Answer »Answer: (a)
Question : 6
Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons?
a) Propane, butane, ethane and methane
b) Butane, ethane, propane and methane
c) Methane, ethane, propane and butane
d) Butane, propane, ethane and methane
Answer »Answer: (c)
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