Class VII

Fire extinguishers are filled with a gas called
  1. carbon dioxide
  2. oxygen
  3. helium
  4. nitrogen
A very hot flame made by mixture of oxygen gas and acetylene is used for
  1. scuba diving
  2. welding
  3. spaceships
  4. hot air balloons
Light bulbs are filled with
  1. helium
  2. neon
  3. argon
  4. hydrogen
Nitrogen is used to preserve food and freeze in
  1. solid state
  2. liquid state
  3. molten state
  4. vapor state
A method which is used to separate, analyze or identify different components in mixture such as food, dyes and inks is called
  1. chromatography
  2. combustion
  3. spectroscopy
  4. Fractional distillation
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