Fire extinguishers are filled with a gas called

  • carbon dioxide
  • oxygen
  • helium
  • nitrogen

Mixing of metals with other metals or non-metals makes

  • alloy
  • metalloid
  • alkali
  • compound

Iron fillings can be separated from iron and sulphur mixture by

  • heating
  • filtration
  • magnetic attraction

The constituents may combine in any portion by mass in

  • element
  • compound
  • mixture
  • reaction

Mud particles cannot pass through

  • filter paper
  • gauze
  • pipette
  • burette

Perfume industry obtains fragrant oil from plants using technique

  • reverse osmosis
  • distillation
  • filtration
  • heating

The condensed water collected in conical flask is called

  • filtrate
  • distillate
  • solvent
  • solute

A method which is used to separate, analyze or identify the different components in mixture such as food, dyes and inks is called

  • chromatography
  • combustion
  • spectroscopy
  • fractional distillation

Boiling point is a point at which liquid turns in to

  • solid
  • gas
  • molten shape
  • vapours

Sea water is left in shallow pans to

  • evaporate
  • filter
  • condense
  • distill

The gases in the air can be separated by process of

  • distillation
  • evaporation
  • fractional distillation
  • decomposition

Mixtures may comprise

  • element
  • compounds
  • solution
  • both a and b

The 'technique' which is used in water treatment plants, is

  • distillation
  • filtration
  • evaporation
  • fractional distillation

Saline solution is mixture of

  • water
  • salt
  • gases
  • both a and b

Mud, water and other substances form

  • mud
  • clay
  • sand
  • cement

When mixtures are formed there is no exchange of

  • energy
  • heat
  • gases
  • all of them

The melting point of 'sodium' is

  • 98
  • 101
  • -101
  • 801

In clean air, the composition of oxygen by volume is

  • 0.2095
  • 0.78
  • 0.009
  • 0.0003

A separation technique which is used to obtain liquid from a solution by heating, is called

  • fractional distillation
  • filtration
  • evaporation
  • distillation

Alloys are impure and they make elements more

  • strong
  • hard
  • soft
  • both a and b
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