Class X

The gas usually filled in the electric bulb is
  1. oxygen
  2. hydrogen
  3. carbon dioxide
  4. nitrogen
Bromine is a
  1. red liquid
  2. black solid
  3. colourless gas
  4. highly inflammable gas
Which are the following number are odd ?
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
Quartz crystals normally used in quartz clocks etc. is chemically
  1. germanium oxide
  2. sodium silicate
  3. silicon dioxide
  4. a mixture of germanium oxide and silicon dioxide
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