Class XI

The element common to all acids is
  1. hydrogen
  2. carbon
  3. sulphur
  4. oxygen
Heavy water is
  1. deuterium oxide
  2. PH7
  3. rain water
  4. tritium oxide
What is laughing gas?
  1. . Nitrous Oxide
  2. Carbon monoxide
  3. . Sulphur dioxide
  4. Hydrogen peroxide
Which of the following are the ingredients of gun metal?
  1. Iron, Zinc, Titanium
  2. . Iron, tin
  3. Iron, Brass, Tin
  4. Copper, Tin
Permanent hardness of water can be removed by adding
  1. chlorine
  2. washing soda
  3. potassium permanganate
  4. bleaching powder
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