General Chemistry 1000+ MCQ with answer for SSC Scientific Assistant

1. Coke is a substance obtained
A. from coal mines
B. when wood is burnt in excess of air
C. by heating coal out of contact with air
D. by heating wood out to contact with air
Answer : C

2. The Long Form of the Periodic Table is based on
A. atomic number
B. valency
C. atomic mass
D. atomic radius
Answer : A

3. In the nitrogen cycle, denitrifying bacteria
A. oxidise ammonia to nitrates
B. convert nitrogen into ammonia
C. oxidise ammonia to free nitrogen
D. oxidise ammonia to oxides of nitrogen
Answer : C

4. Concrete is a mixture of
A. cement an limestone
B. cement and sand
C. cement and gravel
D. cement, sand and gravel
Answer : D

5. Nitrous oxide used as anaesthetic is usually mixed with
A. ethyl alcohol
B. chloroform
C. oxygen
D. methyl alcohol
Answer : C

6. Which of the following elements is not required for the healthy growth of plants?
A. Nitrogen
B. Phosphorus
C. Potassium
D. Mercury
Answer : D

7. The raw materials required for the manufacture of glass are
A. silica, sodium nitrate and soda ash
B. silica, limestone and sodium nitrate
C. silica, sodium oxide and limestone
D. silica, soda ash and limestone
Answer : D

8. Gold dissolves in aqua regia due to the formation of
A. chloro auric acid
B. auric chloride
C. gold nitrate
D. aurous chloride
Answer : A

9. A substance used as a fire-extinguisher under the trade name of Pyrene is
A. carbon dioxide
B. chloroform
C. carbon tetrachloride
D. bleaching powder
Answer : C

10. The fertilizer which has the largest percentage of nitrogen is
A. urea
B. ammonium nitrate
C. ammonium sulphate
D. calcium cyanamide
Answer : A

11. Apart from lead tetra-ethyl, the other compound used as antiknock is
A. n-heptane
B. n-octane
C. iso-heptane
D. iso-octane
Answer : D

12. BHC is a
A. Rodenticide
B. Herbicide
C. Pesticide
D. Fungicide
Answer : C

13. Riboflavin deficiency causes
A. tongue inflammation
B. pellagra
C. night blindness
D. anaemia
Answer : A

14. Which of the following is not a supporter of combustion?
A. Oxygen
B. Air
C. Hydrogen
D. Chlorine
Answer : C

15. Brass contains
A. copper and tin
B. aluminium and magnesium
C. copper and zinc
D. copper, tin and zinc
Answer : C

16. The process that takes place in the atom bomb is
A. nuclear' fusion
B. radioactive disintegration
C. nuclear fission
D. chemical decomposition
Answer : C

17. A common rodenticide is (Rat Poison)
A. malathion
B. parathion
C. zinc phosphide
D. diuron
Answer : C

18. Quick lime has the formula
A. CaO
B. Ca(OH)2
C. NaOH
D. Na2CO3
Answer : A

19. The freezing point of water at 760 mm pressure is
A. 273 K
B. 0 K
C. 273°C
D. -273°C
Answer : A

20. Oxalic acid is used in the manufacture of
A. tincture iodine
B. paints
C. ink
D. aerated water
Answer : C

21. Cupellation is used in the purification of
A. Lead
B. Tin
C. Silver
D. Gold
Answer : C

22. Which of the following is not a metal?
A. Lithium
B. Helium
C. Sodium
D. Cobalt
Answer : B

23. The simplest hydrocarbon is
A. benzene
B. methane
C. ethane
D. butane
Answer : B

24. Dry Ice is
A. solid carbon dioxide
B. liquid oxygen
C. liquid hydrogen
D. liquid. Chlorine
Answer : A

25. The noble gas which is present in microscopic quantities in air is
A. xenon
B. krypton
C. argon
D. helium
Answer : A

26. Which of the following is not a physical change?
A. Distillation of water
B. Action of heat on potassium chlorate
C. Powdering of glass
D. Burning of an electric lamp
Answer : B

27. Iodine in alcohol is known as
A. quick lime
B. tincture iodine
C. rectified spirit
D. None of these
Answer : B

28. The number of neutrons in the nucleus of an atom of mass A and atomic number Z is given by
A. A - Z
B. A + Z
C. Z
D. A
Answer : A

29. The depletion of the ozone layer in the upper atmosphere is due to -extensive use of
A. dichloro-phenoxy-acetic acid
B. superphosphate of lime
C. chlorofluorocarbons (CFC)
D. dichloro-diphenyl-trichloro-ethane
Answer : C

30. A valuable by-product in the manufacture of soap is
A. stearic acid
B. sodium hydroxide
C. palmitic acid
D. glycerol
Answer : D

31. Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to
A. dehydration
B. oxidation
C. reduction
D. dehydrogenation
Answer : B

32. The scientist who synthesised the first organic compound (urea) in the laboratory was
A. Wohler
B. Dalton
C. Lavoisier
D. Fischer
Answer : A

33. Ozone occurs in the upper layers of air in the atmosphere because
A. it is lighter than air
B. in the lower layers it becomes unstable
C. ultra-violet light is present only in the upper layers
D. it mixes freely with O2 in the upper layers
Answer : C

34. The compound which is both an antiseptic and a disinfectant is
A. phenol
B. iodoform
C. bleaching powder
D. blue vitriol
Answer : A

35. Rayon la made from
A. cotton
B. wool
C. cellulose
D. silk
Answer : C

36. The carbon cycle ensures that
A. the percentage of carbon dioxide in air is kept almost constant
B. air always contains a constant proportion of oxygen
C. sufficient amounts of carbohydrates are produced
D. the process of photosynthesis proceeds smoothly
Answer : A

37. Ascorbic acid is the chemical name for
A. Vitamin B6
B. Vitamin C
C. Vitamin K
D. Vitamin D
Answer : B

38. Which of the following can absorb gases quickly?
A. Activated charcoal
B. Anthracite coal
C. Diamond
D. Graphite
Answer : A

39. Which among the following is a metalloid?
A. Tin
B. Silver
C. Iodine
D. Arsenic
Answer : D

40. Rusting is
A. an oxidation process
B. a reduction process
C. a physical change
D. an electro-chemical process
Answer : D

41. Artificial diamonds were produced by
A. Moissan
B. Davy
C. Faraday
D. Marie Curie
Answer : A

42. Petroleum ether is also known as
A. kerosene
B. naphtha
C. lubricating oil
D. asphalt
Answer : B

43. The flux added in the blast furnace is
A. Limestone
B. FeO
C. SiO2
D. MgO
Answer : A

44. The compound or nitrogen used in dry cells is
A. ammonia
B. ammonium nitrate
C. ammonium chloride
D. ammonium nitrite
Answer : C

45. A mixture of naphthalene and sand is separated by
A. evaporation
B. using a magnet
C. sublimation
D. sedimentation
Answer : C

46. Stainless steel contains steel and
A. manganese
B. vanadium
C. nickel
D. chromium
Answer : D

47. Which of the following is a Bleaching agent?
A. Potassium chlorate
B. Hydrogen peroxide
C. Copper sulphate
D. Silver Nitrate
Answer : B

48. Real gases tend to become ideal Under
A. low pressure and high temperature
B. low pressure and low temperature
C. high pressure and low temperature
D. high pressure and high temperature
Answer : A

49. Water always contains hydrogen and oxygen in the ratio 1:8 by weight. This is in accordance with the
A. Law of Multiple Proportions
B. Law of Definite Proportions
C. Law of Conservation of Mass
D. Law of Reciprocal Proportions
Answer : B

50. White vitriol is
A. ZnSO4 . 7H2O
B. FeSO4 . 7H2O
C. MgSO4 . 7H2O
D. CaSO4 . 2H2O
Answer : A