Which of the following mixtures could not be separated into its components by decanting?
Beans in hot water
Sand in water
Coffee in hot water
None of the above
Suitable method to separate lighter impurities from a mixture.
Winnowing
Handpicking
Evaporation
Magnetic separation
Which of the following mixtures will be the most difficult to separate ?
Iron filings + sand
Sand + water
Saw dust + stones
Nitrogen + hydrogen
Which of the following is not a homogenous mixture?
Sugar solution
Salt solution
Iron fillings in sand
None of these
Handpicking method can be applied only when the quantity is
small
high
both (1) and (2)
Cannot be predicted
The method used to separate substances differ in colour, size and shape from a solid mixture is
magnetic separation
decantation
handpicking
sieving
Which among the following is used to separate a mixture of solids?
Sedimentation
Filtration
Sieving
Condensation
Pick out the odd one. Evaporation, magnetic separation, condensation, crystallisation.
Crystallisation
A pure substance is made up of
Only one kind of molecules
Two or more kinds of molecules
Different types of molecules
None
The process by which a solid changes directly into gas is called
Decantation
Sublimation
