Chemistry MCQs with answers Page - 33

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Q. Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of

  • (A) A vinyl group
  • (B) An isopropyl group
  • (C) An acetylenic triple bond
  • (D) Two ethylenic double bonds

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Q. When the nucleus of Uranium is bombarded with neutrons, it breaks up into two nuclei of nearly equal mass. this process is called

  • (A) artificial radioactivity
  • (B) nuclear fusion
  • (C) nuclear fission
  • (D) physical change

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Q. Which of the following is the petroleum wax ?

  • (A) Bees wax
  • (B) Carnauba wax
  • (C) Paraffin wax
  • (D) Jojoba wax

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Q. The hottest part of the gas flame is known as

  • (A) Blue zone
  • (B) Non-luminous zone
  • (C) Luminous zone
  • (D) Dark zone

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Q. Water is not effective in extinguishing a fire caused by petrol because

  • (A) The flame is too hot for water to cool it down
  • (B) Water and petrol react chemically
  • (C) Water and petrol are miscible with each other
  • (D) Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn

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Q. The temperature of oxy-acetylene flame is around

  • (A) 2800°C
  • (B) 3200°C
  • (C) 3600°C
  • (D) 4000°C

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Q. Helium gas is used in gas balloons instead of hydrogen gas because it is

  • (A) Lighter than hydrogen
  • (B) More abundant than hydrogen
  • (C) Non-combustible
  • (D) More stable

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Q. Which of the following is used as non-stick coating for cooking utensils?

  • (A) Perspex
  • (B) Styrofoam
  • (C) Polystyrene
  • (D) Teflon

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Q. Which of the following is used to make light weight, but strong plastic ?

  • (A) Nylon
  • (B) Polythene
  • (C) Polyvinyl Chloride
  • (D) Methyl Methacrylate

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Q. Non-stick kitchenwares are coated with

  • (A) PVC
  • (B) Graphite
  • (C) Teflon
  • (D) Silicon

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