Chemistry MCQs with answers Page - 5

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Q. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

  • (A) 3 billion years
  • (B) 100 years
  • (C) 0.01 minute
  • (D) 13 days

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Q. The gas used for artificial ripening of green fruit is

  • (A) ethylene
  • (B) ethane
  • (C) carbon dioxide
  • (D) acetylene

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Q. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

  • (A) cineole
  • (B) engenol
  • (C) geraniol
  • (D) limonene

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Q. The high reactivity of fluorine is due to

  • (A) its high electro negativity
  • (B) small size of fluorine atom
  • (C) availability of d-orbitals
  • (D) strong F - F bond

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Q. The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

  • (A) 5x/36
  • (B) 5x
  • (C) 7.2 x
  • (D) x/6

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Q. The major constituent of air is

  • (A) carbon dioxide
  • (B) nitrogen
  • (C) oxygen
  • (D) hydrogen

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Q. The main chemical constituent of clay is

  • (A) silicon oxide
  • (B) aluminium borosilicate
  • (C) zeolites
  • (D) aluminium silicate

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Q. The mineral containing both magnesium and calcium is

  • (A) magnesite
  • (B) calcite
  • (C) carnallite
  • (D) dolomite

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