Chemistry MCQs with answers Page - 134

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Q. Which of the following has low density and low melting point ?

  • (A) Na
  • (B) Fe
  • (C) Cu
  • (D) Au

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Q. If the electronic configuration of an element is 2, 8, 2, to which period of the Modern Periodic Table does it belong ?

  • (A) 4
  • (B) 2
  • (C) 12
  • (D) 3

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Q. Modern periodic table is based on .......... ?

  • (A) atomic number
  • (B) number of positrons
  • (C) atomic mass number
  • (D) number of neutrons

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Q. Which of the following can undergo sublimation ?

  • (A) Ammonium chloride
  • (B) Ammonium chlorate
  • (C) Ammonium sulphate
  • (D) Ammonium phosphate

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Q. The millions period consists of the places ?

  • (A) M, TH, HM
  • (B) O,T,M
  • (C) M,TM
  • (D) TTh, HTh, M

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Q. The pH of pure water is

  • (A) 2
  • (B) 5
  • (C) 7
  • (D) 8

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Q. ..... is least reactive element belonging to group 17 ?

  • (A) Bromine
  • (B) Iodine
  • (C) Chlorine
  • (D) Fluorine

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Q. In which of the following classifications are the elements arranged in the order of their increasing atomic number ?

  • (A) The Modern Periodic Table
  • (B) Mendeleev's Periodic Table
  • (C) Newland's Law of Octaves
  • (D) Dobereiner's Triads

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Q. The conversion of a solid directly into its vapour is called ?

  • (A) Evaporation
  • (B) Condensation
  • (C) Vaporisation
  • (D) Sublimation

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Q. Fats and oils become rancid because of ?

  • (A) transpiration
  • (B) reduction
  • (C) oxidation
  • (D) corrosion

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