Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination
31.Which of the following represents vinegar?
[A] 20% solution of acetic acid in ethanol
[B] 20% solution of acetic acid in water
[C] 5-8% solution of acetic acid in water
[D] 40-50% solution of acetic acid in water
Correct Answer: C [5-8% solution of acetic acid in water]
Notes:
5-8% solution of acetic acid in water is called vinegar. It is used widely as a preservative in pickles. Acetic acid is the common name of Ethanoic acid.
32.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
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).
33.What is the octane number of iso-octane?
[A] 1
[B] 0
[C] 100
[D] 200
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.
34.Which of the following is a property of Alkanes?
[A] Alkanes are unreactive at normal conditions
[B] Alkanes are also known as Paraffins
[C] Both a and b
[D] None
Correct Answer: C [Both a and b]
Notes:
Alkanes are inert under normal conditions as they do not react with acids, bases and other reagents. They are also known as paraffins.
35.What is the monomer unit of PMMA?
[A] butyl methacrylate
[B] ethyl methacrylate
[C] methyl methacrylate
[D] iso-propyl methacrylate
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.
36.Which of these polymers is used for controlled drug release in the body?
[A] PLA
[B] PHBV
[C] PGA
[D] PCL
Correct Answer: B [PHBV]
Notes:
PHBV is a copolymer of 3 – hydroxy butanoic acid, and (3 – hydroxypentanoic acid). It is used in controlled drug release in the body as the drug put in PHBV capsule is released after this polymer is degraded by enzymatic action.
37.Which of these is not a Linear polymer?
[A] Starch
[B] Polyethelene
[C] Nylons
[D] Polyesters
Correct Answer: A [Starch]
Notes:
The polymers in which monomeric units are linked together to form linear chains are known as a linear polymer. Examples are polyethelene, nylons and polyesters.
38.Which of the following metals is involved in the anodisation process?
[A] Aluminium
[B] Copper
[C] Bismuth
[D] Calcium
Correct Answer: A [Aluminium]
Notes:
Anodising is a process of forming a thick oxide layer of aluminium. Aluminium develops a thin oxide layer when exposed to air. This layer of aluminium oxide makes aluminium resistant to further corrosion.
39.Which of the following metals is the major constituent of Pewter alloy?
[A] Tin
[B] Indium
[C] Titanium
[D] Lead
Correct Answer: A [Tin]
Notes:
Tin is the major constituent of Pewter alloy. It is traditionally composed of 85–99% tin, mixed with copper, antimony, bismuth.
40.Which of the following detergents represent the liquid dishwashing detergents?
[A] Anionic
[B] Cationic
[C] Non-ionic
[D] None of the above
Correct Answer: C [Non-ionic]
Notes:
Liquid dishwashing detergents are of non-ionic type. Non-ionic detergents do not contain any ion in their constitution.
