Class XI

Which of the following is in liquid form at room temperature?
  1. Lithium
  2. Sodium
  3. Francium
  4. . Cerium
Brass gets discoloured in air because of the presence of which of the following gases in air?
  1. Oxygen
  2. Hydrogen sulphide
  3. Carbon dioxide
  4. Nitrogen
From which mineral is radium obtained?
  1. . Rutile
  2. Haematite
  3. Limestone
  4. . Pitchblende
The element common to all acids is
  1. hydrogen
  2. . carbon
  3. . sulphur
  4. oxygen
The element common to all acids is
  1. hydrogen
  2. carbon
  3. sulphur
  4. oxygen
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