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
Solid particles which are left on filter paper while filtration is called
  1. residue
  2. filtrate
  3. solvent
  4. solute
Fire extinguishers are filled with a gas called
  1. carbon dioxide
  2. oxygen
  3. helium
  4. nitrogen
When mixtures are formed there is no exchange of
  1. energy
  2. heat
  3. gases
  4. constituents
Mixtures may comprise
  1. element
  2. compounds
  3. both a and b
  4. none of above
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