Class VII

Nitrogen helps in making of nitrogen based
  1. plants
  2. fertilizers
  3. seeds
  4. trees
By physical processes constituents can be separated in
  1. element
  2. compound
  3. mixture
  4. reaction
Iron fillings can be separated from iron and Sulphur mixture by
  1. heating
  2. filtration
  3. magnetic attraction
  4. all of them
Light bulbs are filled with
  1. helium
  2. neon
  3. argon
  4. hydrogen
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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