General Chemistry MCQ Solved Paper for ISRO Recruitment

1. Which one of the following is used in dry cleaning of garments?
A. asphalt
B. naphtha
C. diesel oil
D. lubricating oil
Answer : B

2. Which or the following gases is soluble in water and Is collected by the downward displacement or air?
A. Carbon dioxide
B. Sulphur dioxide
C. Ammonia
D. Hydrogen
Answer : C

3. Solid carbon dioxide (Dry ice) is also known as
A. Thiokol
B. Drikold
C. Perhydrol
D. Mannitol
Answer : B

4. The chemical name of aspirin is
A. acetamide phenol
B. malonyl urea
C. aminosalicylic acid
D. acetyl salicylic acid
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. The science which deals with the chemistry of life processes is known as
A. electrochemistry
B. physical chemistry
C. biochemistry
D. tinctorial chemistry
Answer : C

7. Phosgene is a compound of
A. red phosphorus and oxygen
B. white phosphorus and oxygen
C. carbon monoxide and chlorine
D. carbon dioxide and chlorine
Answer : C

8. Cinnabar is an ore of
A. lead
B. zinc
C. mercury
D. chromium
Answer : C

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

10. Two or more entirely different compounds having the same molecular formula are known as
A. isobars
B. isotopes
C. isomorphs
D. isomers
Answer : D

11. Soda-water contains
A. sodium bicarbonate
B. sodium carbonate
C. carbonic acid
D. sodium hydroxide
Answer : C

12. An acid which is used as a preservative for pickles is
A. hydrochloric acid
B. citric acid
C. tartaric acid
D. acetic acid
Answer : D

13. Hydrogen gas has
A. a very sweet smell
B. a very pungent smell
C. an irritating smell
D. no smell at all
Answer : D

14. An element which is preserved under water is
A. Sodium
B. red phosphorus
C. white phosphorus
D. sulphur
Answer : C

15. The value of Avogadro Number is
A. 6.023 x 1022
B. 1 x 10-14
C. cl 6.056 x 10-6
D. 6.023 x 1023
Answer : D

16. The term 'nucleons' apples to
A. neutrons
B. protons
C. protons and neutrons
D. protons and electrons
Answer : C

17. In photography, the compound or nitrogen used is
A. Potassium nitrate
B. Silver nitrate
C. Ammonium carbonate
D. Ammonium bicarbonate
Answer : B

18. The raw materials used in the manufacture of cement are
A. brimstone and silica
B. limestone and clay
C. brimstone and clay
D. brimstone and limestone
Answer : B

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

20. Jeweller's rouge is
A. magnetic oxide of iron
B. ferric oxide
C. ferrous oxide
D. ferrous carbonate
Answer : B

21. Smelling salt contains
A. ammonium chloride
B. ammonium carbonate
C. ammonium sulphate
D. potassium nitrate
Answer : B

22. Lead pencils contain
A. white lead
B. graphite
C. red lead
D. coke
Answer : B

23. Which of the following la a very good supporter of combustion?
A. Carbon monoxide
B. Oxygen
C. Nitrogen
D. Hydrogen
Answer : B

24. 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

25. A non-metal which is a good conductor of electricity is
A. graphite
B. phosphorus
C. sulphur
D. iodine
Answer : A

26. Laughing gas is
A. nitric oxide
B. nitrogen peroxide
C. nitrogen pentoxide
D. nitrous oxide
Answer : D

27. Which of the following cannot be used as fuel?
A. Gasoline
B. Kerosene
C. Sulphuric acid
D. Alcohol
Answer : C

28. 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

29. Burglar proof safes are made of
A. Tungsten steel
B. Manganese steel
C. Chromium steel
D. Nickel steel
Answer : B

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

31. The human body contains about
A. 50% water
B. 10% water
C. 70% water
D. 20% water
Answer : C

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

33. Solder is an alloy of
A. tin and copper
B. tin and lead
C. tin and zinc
D. tin, copper and zinc
Answer : C

34. Which among the following is a solid non-metal?
A. chlorine
B. mercury
C. water
D. iodine
Answer : D

35. Methylated spirit is a mixture of
A. methyl alcohol and acetic acid
B. methyl alcohol and ethyl alcohol
C. ethyl alcohol and pyridine
D. methyl alcohol and pyridine
Answer : B

36. Grape sugar is another name for
A. glucose
B. fructose
C. sucrose
D. maltose
Answer : A

37. Physico-chemical characteristics of water in water sources undergo changes due to
A. aquatic macrophytes
B. aquatic fungi
C. effluents
D. evapotranspiration
Answer : A

38. Marsh gas is
A. ethane
B. ethylene
C. acetylene
D. methane
Answer : D

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

40. 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

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

42. Setting of cement is due to
A. hydration
B. dehydration
C. dialysis
D. osmosis
Answer : A

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

44. Vulcanisation was discovered by
A. Goodyear
B. Wohler
C. Baeyer
D. Perkin
Answer : A

45. Reduction involves
A. loss of electrons
B. gain of electrons
C. gain of oxygen
D. removal of hydrogen
Answer : B

46. The earliest name given to nitrogen was
A. dephlogisticated air
B. azote
C. inflammable air
D. marine acid air
Answer : B

47. Which of the following process involves removal of the elements of water?
A. Hydrolysis
B. Hydrogenation
C. Dehydration
D. Dehydrogenation
Answer : C

48. A metal which occurs 'free' in nature is
A. gold
B. zinc
C. tin
D. molybdenum
Answer : A

49. Which or the following is not a constituent or gun powder?
A. Ammonium nitrate
B. Nitre
C. Charcoal powder
D. Sulphur
Answer : A

50. 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