General Science Chemistry MCQs
Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination
61. Ethanoic acid is the main constituent of which of the following substances?
[A] Soap
[B] Vinegar
[C] Wine
[D] Curd
Show Answer
Correct Answer: B [Vinegar]
Notes:
Common name of Ethanoic acid is acetic acid and its main constituent of is a colourless liquid. 5-8% solution of acetic acid in water is called vinegar and is used widely as a preservative in pickles. The melting point of pure ethanoic acid is 290 K.
62. What is the chemical formula of Hydrogen Cyanide?
[A] HCN2
[B] H2CN
[C] HCN
[D] HC
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Correct Answer: C [HCN]
Notes:
HCN is the chemical formula of Hydrogen Cyanide. It is also called as Prussic acid. It is a colorless, extremely poisonous and flammable liquid.
63. Which of the following compounds can be made by blowing ozone at dry ice?
[A] Carbonic acid
[B] Carbon dioxide
[C] Carbon trioxide
[D] Methane
Show Answer
Correct Answer: C [Carbon trioxide]
Notes:
Carbon trioxide (CO3) is an unstable oxide of carbon. Carbon trioxide can be made by blowing ozone at dry ice (solid CO2).
64. Which of the following represents the mixture of carbon monoxide and nitrogen?
[A] Coal tar
[B] Producer gas
[C] Water gas
[D] All of the above
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Correct Answer: B [Producer gas]
Notes:
Producer gas is a mixture of carbon monoxide and nitrogen. Producer gas is produced by passing air over red-hot coke. Coke is also used in the production of producer gas.
65. Which of the following represents the mixture of carbon monoxide and hydrogen?
[A] Water gas
[B] Producer gas
[C] Coal Tar
[D] Bitumen
Show Answer
Correct Answer: A [Water gas]
Notes:
Water gas is a mixture of carbon monoxide and hydrogen. Semi-water gas is a mixture of water gas and producer gas made by passing a mixture of air and steam through heated coke.
66. What is the octane number of iso-octane?
Show Answer
Correct Answer: C [100]
Notes:
Octane number, also known as octane rating, are based on a scale on which iso-octane is 100, which means minimal knock, and heptane is 0. The higher the octane number, the more compression required for fuel ignition.
67. Which of these polymers are used to produce Butyl-rubber?
[A] butadiene and neoprene
[B] butadiene and styrene
[C] butadiene and acrylonitrile
[D] butadiene and isobutylene
Show Answer
Correct Answer: D [butadiene and isobutylene]
Notes:
Butyl-rubber is a synthetic rubber which is obtained as a result of co-polymerization of butadiene and isobutylene.
68. What is the monomer unit of Teflon?
[A] Acetylene
[B] terafluoroethylene
[C] neoprene
[D] Propylene
Show Answer
Correct Answer: B [terafluoroethylene]
Notes:
The monomer unit of Teflon is terafluoroethylene molecule. Teflon is prepared by heating tetra fluoroethylene under pressure in the presence of ammonium peroxosulphate.
69. What is the monomer unit of PMMA?
[A] butyl methacrylate
[B] ethyl methacrylate
[C] methyl methacrylate
[D] iso-propyl methacrylate
Show Answer
Correct Answer: C [methyl methacrylate]
Notes:
The monomer unit of PMMA is methyl methacrylate. It is a hard and transparent polymer and quite resistant to the effect of heat, light and ageing. It has high optical clarity.
70. Which of these is a biodegradable polymer?
[A] PLA
[B] PCL
[C] PGA
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
A large number of bio degradable polymers are now available will replace non-bio-degradable polymers as their cost reduces. Some of the important biodegradable polymers are PHBV, PGA, PLA and PCL.
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