Chemistry MCQs with answers Page - 46

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A

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Q. In fireworks, the green flame is produced because of

  • (A) Barium
  • (B) Potassium
  • (C) Sodium
  • (D) Mercury

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Q. The nucleus of a hydrogen atom consists of

  • (A) 1 proton only
  • (B) 1 electron only
  • (C) 1 neutron only
  • (D) 1 proton + 2 neutrons

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Q. The chemical symbol of Sodium is

  • (A) K
  • (B) Na
  • (C) So
  • (D) S

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Q. The constituents of automobile exhaust that can cause cancer is/are :

  • (A) Oxides of nitrogen
  • (B) Carbon monoxide
  • (C) Polycyclic hydrocarbons
  • (D) Lead

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Q. The acid rain destroys vegetations because it contains

  • (A) Nitric acid
  • (B) Ozone
  • (C) Carbon monoxide
  • (D) Sulphuric acid

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Q. Of the following which one pollutes the air of a big city ?

  • (A) Copper
  • (B) Chromium
  • (C) Lead
  • (D) Calcium

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Q. Which of the following is usually not an air-pollutant?

  • (A) Hydrocarbons
  • (B) Sulphur dioxide
  • (C) Carbon dioxide
  • (D) Nitrous oxide

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Q. Which of the following pollutants is main product of automobile exhaust ?

  • (A) CO
  • (B) CO2
  • (C) NO
  • (D) Hydrocarbons

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Q. The smog is essentially caused by the presence of

  • (A) O3 and N2
  • (B) O2 and N2
  • (C) Oxides of N and S
  • (D) O2 and O3

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Q. The depletion in Ozone layer is caused by ________ .

  • (A) Nitrous oxide
  • (B) Carbon dioxide
  • (C) Chlorofluorocarbons
  • (D) Methane