Separation techniques

Separation techniques are used to separate

• mixtures

• compounds

• elements

• all of the above

Which method can be used to separate sand from mixture of sand and water?

• simple distillation

• filtration

• chromatography

• magnetic separation

The substance left behind on the filter paper after filtration is called

• filtrate

• deposit

• residue

• distillate

Simple distillation of seawater is carried out. What is the identity of the distillate?

• salt

• seawater

• pure water

• sand

Which of the following, when mixed with sand, can be retrieved by magnetic separation?

• pieces of aluminium foil

• some small steel nails

• some silver coins

• zinc powder

Which change of state happens inside the condenser during simple distillation of a salt solution?

• gas to liquid

• liquid to gas

• liquid to solid

• gas to solid

Simple distillation can be used to separate

• water from ethanol and water mixture

• sugar from sugar solution

• sand from salt and sand mixture

• water from a salt solution

In distillation, the function of boiling stones is for

• increase rate of heating

• produce more bubbling

• smooth boiling

• lower the boiling point

Which solvent(s) is suitable for use in paper chromatography?

• dilute acid

• ethanol

• water

• all of the above

Mixtures are separated in chromatography based on

• the different solubilities of the components

• the different boiling points of the components

• the different chemical properties of the components

• the different melting points of the components