GK-Chemistry Question and Answer

GK-Chemistry Question and Answer
61. The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
  • chain isomerism
  • functional group isomerism
  • positional isomerism
  • metamerism
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62. The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of
the isotope will be left behind?
  • 1/6
  • 1/3
  • 1/8
  • 1/4
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63. The number of waves made by an electron moving in an orbit having maximum magnetic
quantum number is +3
  • 4
  • 5
  • 2
  • zero
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64. The National Chemical Laboratory is situated in
  • New Delhi
  • Bangalore
  • Pune
  • Patna
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65. Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be
  • 2 : 16 : 2
  • 2 : 16 : 1
  • 1 : 16 : 2
  • 1 : 1 : 1
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66. The mass number of an atom is equal to
  • the number of protons
  • the number of protons and electrons
  • the number of nucleons
  • the number of neutrons
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67. The maximum number of covalent formed by nitrogen is
  • 1
  • 2
  • 3
  • 4
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68. The metal that is usually extracted from sea water is
  • Ca
  • Na
  • K
  • Mg
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69. The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
  • liquation
  • leaching
  • levigation
  • magnetic separation
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70. The inert gases are ____ in water
  • sparingly soluble
  • insoluble
  • soluble
  • None of these
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