Q. The term 'CRACKING' in the context of organic molecules is -
1) The process of fractional distillation in refineries
2) Breaking of a large alkane molecule into smaller hydrocarbon molecules
3) A nuclear reaction wherein the nucleus is broken
4) Use of fire crackers to produce heat to initiate certain chemical reactions
Q. The percentage of carbon in one molecule of carbon dioxide is approximately -
1) 2.73%
2) 72.7%
3) 80.0%
4) 27.3%
Q. The chemical formula of natural gas is -
1) C3H8
2) CH4
3) C4H10
4) C2H6
Q. The isotopes of an element are characterized by which of the following?
1) The presence of neutrons of unusual size
2) Different numbers of electrons in the atom
3) Different numbers of protons in the nucleus
4) Different numbers of neutrons in the nucleus
Q. Which one of the following is a widely used solid lubricant?
1) Graphite
2) Sodium
3) Lithium
4) Zinc
Q. Which one of the following is a major constituent of petrol?
1) Pentane (C5 H12)
2) Octane (C8 H18)
3) Methane (CH4)
4) Hexane (C6 H14)
Q. Which one of the following gases is mainly responsible for the GREENHOUSE EFFECT?
1) Sulphur dioxide
2) Carbon mono-oxide
3) Hydrogen sulphide
4) Carbon dioxide
Q. For respiration deep sea divers use mixture of -
1) Oxygen and carbon dioxide
2) Hydrogen and oxygen
3) Oxygen and nitrogen
4) Oxygen and helium
Q. The lowest percentage of carbon is in -
1) Cast iron
2) Steel
3) Wrought iron
4) Pig iron
Q. Camphor can easily be purified by the process of -
1) Sublimation
2) Distillation
3) Crystallisation
4) Sedimentation
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