Wheat flour is separated from wheat bran by the method of
Hand picking
Sieving
Winnowing
Filtration
A mixture is a / an
Pure subtance
Impure substance
Some are pure and others are impure
None
The following property is used to find the purity of a substance
Specific gravity
Volume
Temperature
Mass
Choose the substance that shows sublimation
Napthalene
Toluene
Kerosene
Water
To separate ammonium chloride from common salt, we use
Sedimentation
Sublimation
A few coloured glass pieces that are big in size are mixed with sugar. The easiest way to separate them is
Heat the mixture
Add the mixture to water
Handpick the glass pieces
Handpick the sugar particles
Identify the mixture from the following
Carbon dioxide
Iron
Hydrogen
Air
Pure substances possess
Variable melting points and boiling points
Nonuniform
Variable properties
Fixed melting points and boiling points
Which of the following mixtures will be the most difficult to separate ?
Iron filings + sand
Sand + water
Saw dust + stones
Nitrogen + hydrogen
A compound has
Only one kind of atom
Only one kind of element
A mixture of elements and molecules
Only one kind of molecules