Class VI

Oxygen is used in manufacture of
  1. glass
  2. medicine
  3. metal
  4. chemical
Chemical formula of ozone is
  1. O3
  2. O2
  3. O4
  4. O5
Respiration takes place at/in
  1. all of these
  2. night
  3. day time
  4. evening
State that fills volume of its container is
  1. semi liquid
  2. solid
  3. gas
  4. liquid
Process of burning under presence of oxygen is known as
  1. combustion
  2. reaction
  3. respiration
  4. production
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