UPSC
CAPF (AC) EXAM 2016 – 2020: CHEMISTRY MCQs
1. Magnesium is used in
(a) fireworks to make a bright white light
(b) gemstones in jewellery
(c) examination of alimentary canal of the
patient
(d) Purification of water
2. Which one of the following ingredients does
not constitute paint?
(a) Turpentine oil (thinner)
(b) Poly-hydroxy phenols (anti – skinning agent)
(c) Thiourea (accelerator)
(d) Titanium dioxide (pigment)
3. Which one of the following statements about
alkaline earth metals is not true?
(a) Strontium salts burn with a red flame
(b) Barium metal is used in medicine to examine
the alimentary canal of a patient by X-ray
(c) Green plants need magnesium in order to make
chlorophyll that trap the energy from sunlight in photosynthesis
(d) Red colour of gemstone Ruby is due to the
element Beryllium present in it
4. Which one of the following gases produces a
red light when electricity flows through it?
(a) Helium
(b) Argon
(c) Nitrogen
(d) Neon
5. Which one of the following methods can be used
to remove permanent hardness of water?
(a) Boiling
(b) Ion – exchange
(c) Lime treatment
(d) Bubbling sulphur dioxide gas
6. Which one of the following is NOT a component
of photochemical smog?
(a) Ozone
(b) Peroxyacetyl nitrate
(c) Polyaromatic hydrocarbons
(d) Nitric oxide
7. If formula of sodium salt of an anion X is Na2X,
then the formula of its aluminium salt would be
(a) AlX
(b) AlX3
(c) Al2X3
(d) Al3X2
8. Quartz is extensively used as a piezo-electric
material. It contains
(a) Hg
(b) Si
(c) Ti
(d) Sn
9. Which one of the following is used for water
softening?
(a) Mg(HCO3)2
(b) Na3PO4
(c) Na6p6O18
(d) Na2HPO4
10. The number of neutrons inside the nucleus of
the element Uranium 235 is
(a) 235
(b) 92
(c) 143
(d) 51
11. The Soda-acid fire extinguisher contains
(a) Sulphuric acid and solution of sodium
hydrogencarbonate
(b) nitric acid and solution of sodium
hydrogencarbonate
(c) Sulphuric acid and solution of sodium
carbonate
(d) Sulphuric acid and solution of potassium
carbonate
12. Aluminium, Iron, Copper and Zinc are extracted
from
(a) Bauxite, Magnetite, Malachite and Calamine
respectively
(b) Magnetite, Bauxite, Malachite and Calamine respectively
(c) Calamine, Malachite, Magnetite and Bauxite
respectively
(d) Malachite, Magnetite, Bauxite and Calamine respectively
13. Which one of the following does NOT contain
COOH group?
(a) Citric acid
(b) Lactic acid
(c) Tartaric acid
(d) Ascorbic acid
14. Which of the following are the most
favourable conditions for liquefying a gas?
(a) Low pressure and high temperature
(b) Low pressure and low temperature
(c) High pressure and high temperature
(d) High pressure and low temperature
15. Which one of the following is known as Wood
Spirit?
(a) Methanol
(b) Ethanol
(c) Formaldehyde
(d) Acetaldehyde
16. Which one of the following will NOT show
Tyndall effect?
(a) Chalk powder freshly mixed with water
(b) Lime Juice
(c) Few drops of milk mixed with water
(d) Starch solution
17. Which one of the following is anisotropic in
nature?
(a) Glass
(b) Rubber
(c) Plastic
(d) Quartz
18. Which one of the following is not a condensation
polymer?
(a) Nylon
(b) DNA
(c) Polythene
(d) Bakelite
19. Match List I with List II and select the
correct answer using the code given below the lists:
List – I
List – II
(Compound)
(Type of polymer)
A. Melamine
1. Linear
B. Polyvinyl chloride
2. Condensation
C. Terylene
3. Natural
D. Cellulose
4. Cross-Linked
Code:
(a) A3 B2 C1 D4
(b) A4 B1 C2 D3
(c) A3 B1 C2 D4
(d) A4 B2 C1 D3
20. Which of the following statements about
carboxylic acids is/are correct?
1. Simple aliphatic carboxylic acids are soluble
in water
2. Higher carboxylic acids are practically
insoluble in water
3. The acidity of a carboxylic acid depends on
the number of carbon atoms present in the hydrocarbon chain
Select the correct answer using the code given
below
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 only
(d) 1, 2 and 3
21. Lowering the atmospheric pressure on a liquid
(a) increases the boiling point of the liquid
(b) lowers the boiling point of the liquid
(c) does not affect the boiling point of the
liquid
(d) increase the time required for it to boil
22. The number of angular and radial nodes for 4d
Orbital is respectively
(a) 2 and 1
(b) 1 and 2
(c) 3 and 1
(d) 4 and 0
23. Which one of the following gemstones contains
beryllium metal?
(a) Topaz
(b) Emerald
(c) Ruby
(d) Blue Sapphire
24. Liquid water is denser than ice due to
(a) higher surface tension
(b) hydrogen bonding
(c) Van der waals forces
(d) Covalent bonding
25. Which one of the following is the chemical
name of heavy water?
(a) Hydrogen oxide
(b) Deuterium dioxide
(c) Deuterium oxide
(d) Heavy hydrogen oxide
26. Bronze is an alloy of copper and
(a) Nickel
(b) Iron
(c) Tin
(d) aluminium
27. Which one of the following statements is not
correct?
(a) Graphite is a non metal
(b) Graphite is an allotrope of carbon
(c) Graphite is a conductor of electricity
(d) Graphite has a tetrahedral structure
28. Which one of the following statements is not
correct?
(a) Bleaching powder is prepared by the action of
chlorine on dry slaked lime [Ca(OH)2]
(b) Bleaching powder acts as a reducing agent in
many chemical industries
(c) Bleaching powder is also known as chlorinated
lime
(d) Bleaching powder is used for disinfecting
drinking water
29. Arrange the following substances in their
order of increasing hardness?
1. Gypsum
2. Topaz
3. Fluorite
4. Feldspar
Select the correct answer using the code given
below:
(a) 4 – 3 – 2 – 1
(b) 1 – 3 – 4 – 2
(c) 3 – 4 – 2 – 1
(d) 1 – 4 – 3 – 2
30. Match List I with List II and select the
correct answer using the code given below the lists:
List I
List II
(Isotope) (Application)
A. Carbon
1. Treatment of goitre
B. Cobalt
2. Calculation of age of the earth
C. Iodine
3. Treatment of Cancer
D. Uranium
4. Fuel in nuclear reactors
Code:
(a) A2 B3 C1 D4
(b) A2 B1 C3 D4
(c) A4 B1 C3 D2
(d) A4 B3 C1 D2