GK-Chemistry Question and Answer

GK-Chemistry Question and Answer
51. The metal does not give H2 on treatment with dilute HCL is
  • Zn
  • Fe
  • Ag
  • Ca
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52. The number of g-molecule of oxygen in 6.02 x 1024CO molecules is
  • 1 gram of molecule
  • 0.5 gram of molecule
  • 5 gram of molecule
  • 10 gram of molecule
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53. The most extensive, commercially useful source of thorium as monazite sand occurs in India at
  • Orissa coast
  • Travancore coast
  • West Bengal coast
  • Gujarat coast
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54. The main active constituent of tea and coffee is
  • nicotine
  • chlorophyll
  • caffeine
  • aspirin
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55. The maximum number of isomers for an alkene with molecular formula C4H8 is
  • 5
  • 4
  • 2
  • 3
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56. The hardest form of carbon is
  • coke
  • graphite
  • diamond
  • charcoal
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57. The most important ore of aluminium is
  • bauxite
  • magnetite
  • haematite
  • monazite
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58. The number of electrons presents in H+ is
  • zero
  • one
  • two
  • three
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59. The hottest part of the gas flame is known as
  • luminous zone
  • dark zone
  • blue zone
  • non-luminous zone
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60. The human body is made up of several chemical elements; the element present in the highest
proportion (65%) in the body is
  • carbon
  • hydrogen
  • oxygen
  • nitrogen
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