Chemistry MCQs with answers Page - 3

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Q. What are the number of moles of CO2 which contains 16 g of oxygen?

  • (A) 0.5 mole
  • (B) 0.2 mole
  • (C) 0.4 mole
  • (D) 0.25 mole

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Q. The main use of salt in the diet is to

  • (A) make the taste of food better
  • (B) produce in small amounts the hydrochloric acid required for the digestion of food
  • (C) ease the process of cooking
  • (D) increase the solubility of food particles in water

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Q. The monomer of polythene is

  • (A) vinyl chloride
  • (B) ethylene
  • (C) ethyl alcohol
  • (D) None of the above

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Q. The luster of a metal is due to

  • (A) its high density
  • (B) its high polishing
  • (C) its chemical inertness
  • (D) presence of free electrons

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Q. The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

  • (A) 1.568 x 10^3
  • (B) 6.023 x 10^19
  • (C) 4.84 x 10^17
  • (D) 6.023 x 10^23

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Q. Which scientist discovered the radioactive element radium?

  • (A) Isaac Newton
  • (B) Albert Einstein
  • (C) Benjamin Franklin
  • (D) Marie Curie

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Q. The oil used in the froth floatation process is

  • (A) coconut oil
  • (B) olive oil
  • (C) kerosene oil
  • (D) pine oil

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Q. The mass of one Avogadro number of helium atom is

  • (A) 1.00 gram
  • (B) 4.00 gram
  • (C) 8.00 gram
  • (D) 4 x 6.02 x 10^23 gram

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Q. The items amenable to detection by soft x-rays are

  • (A) contrabands
  • (B) lead in bullets
  • (C) narcotics
  • (D) genuine coins from counterfeit coins

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