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) Oxygen, calcium, phosphorus
(b) Hydrogen, oxygen, sodium
(c) Carbon, hydrogen, nitrogen
(d) Carbon, hydrogen, potassium
The correct answers to the above question in:
Answer: (c)
Carbon, hydrogen and nitrogen were primarily responsible for the origin of life on the earth.
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Read more organic chemistry Based General Science Questions and Answers
Question : 1
The main constituent of Vinegar is:
a) Ascorbic acid
b) Citric acid
c) Acetic acid
d) Tartaric acid
Answer »Answer: (c)
Question : 2
Mineral acids are stronger acids than carboxylic acids because
- mineral acids are completely ionized
- carboxylic acids are completely ionized
- mineral acids are partially ionized
- carboxylic acids are partially ionized
a) B and C
b) A and B
c) A and D
d) C and D
Answer »Answer: (c)
Question : 3
The flavour of apple is mainly due to which one of the following?
a) Benzene
b) Ethanol
c) Formalin
d) Benzaldehyde
Answer »Answer: (b)
Question : 4
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 : 5
General formula of alkyne is
a) CnH2n–2
b) CnH2n
c) CnH2n+2
d) CnHn
Answer »Answer: (a)
Question : 6
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.
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