Class XI

From which mineral is radium obtained?
  1. . Rutile
  2. Haematite
  3. Limestone
  4. . Pitchblende
Permanent hardness of water can be removed by adding
  1. chlorine
  2. washing soda
  3. potassium permanganate
  4. bleaching powder
Air is a/an
  1. compound
  2. element
  3. electrolyte
  4. mixture
Which of the following is in liquid form at room temperature?
  1. Lithium
  2. Sodium
  3. Francium
  4. . Cerium
Diamond is an allotropic form of
  1. germanium
  2. . carbon
  3. silicon
  4. sulphur
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