Chemistry MCQs with answers Page - 37

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Q. The most electropositive elements among the following is

  • (A) Na
  • (B) K
  • (C) Cs
  • (D) Ca

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Q. A substance emits energy which is detected as a line emission in the visible region using a spectroscope. The origin of this energy is

  • (A) Vibrational energy of the molecules
  • (B) Rotational energy of the molecules
  • (C) Energy of protons in the nucleus.
  • (D) Energy of orbital electrons

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Q. The cells that are directly concerned with phagocytosis of foreign bodies in the reticulo-endothelial system are

  • (A) monocytes
  • (B) macrophages
  • (C) eosinophils and Basophils
  • (D) reticular cells

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Q. The elements that provide colour to fireworks are

  • (A) chromium and nickel
  • (B) strontium and barium
  • (C) zinc and sulphur
  • (D) potassium and mercury

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Q. Laundry soap is

  • (A) sodium sulphate
  • (B) sodium carbonate
  • (C) a mixture of sodium salts of higher fatty acids of natural origin
  • (D) a mixture of sodium salts of synthetic sulphonic acids

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Q. Oxidation is a process which involves the
1.Loss of electrons
2.Gain of oxygen
3.Gain of electrons
4.Loss of oxygen The correct answers are:

  • (A) 2 and 4
  • (B) 3 and 4
  • (C) 1 and 2
  • (D) 2 and 3

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Q. Passing a battery current through a solution of brine will produce

  • (A) Chlorine and sodium
  • (B) Sodium hydroxide and chlorine
  • (C) Chlorine and hydrogen
  • (D) Sodium hydroxide and oxygen

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Q. Gases have

  • (A) A definite volume but not shape
  • (B) A definite volume and shape
  • (C) A definite shape but not volume
  • (D) Neither definite volume nor shape

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Q. What are the soaps?

  • (A) Salts of silicates
  • (B) Esters of heavy fatty acids
  • (C) Sodium or potassium salts of heavier fatty acids
  • (D) Mixture of glycerol and alcohols

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Q. From which mineral is radium obtained?

  • (A) Pitchblende
  • (B) Rutile
  • (C) Haematite
  • (D) Limestone

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