Class X

Which of the following is used in pencils?
  1. Graphite
  2. Silicon
  3. Charcoal
  4. Phosphorous
The gas usually filled in the electric bulb is
  1. oxygen
  2. hydrogen
  3. carbon dioxide
  4. nitrogen
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
Which are the following number are odd ?
Which of the following metals forms an amalgam with other metals?
  1. Tin
  2. Mercury
  3. Lead
  4. Zinc
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