Class VII

To separate different constituents with different boiling points into fractions there is use of
  1. fractioning column
  2. fractioning tower
  3. both a and b
  4. fractioning box
Alloys are impure and they are made to make elements more
  1. stronger
  2. harder
  3. both a and b
  4. softer
Perfume industry obtain fragrant plants oil using technique
  1. reverse osmosis
  2. distillation
  3. filtration
  4. heating
Boiling point is a point at which liquid turns in to
  1. solid
  2. gas
  3. molten
  4. fluidic
Gases in air can be separated by process of
  1. distillation
  2. evaporation
  3. fractional distillation
  4. decomposition
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