The following property is used to find the purity of a substance
Specific gravity
Volume
Temperature
Mass
Winnowing is useful only when
Two solids have different melting points
Two solids have different boiling points
Two solids have different magnetic properties
Two solids have different weights
Which of the following mixtures will be the most difficult to separate ?
Iron filings + sand
Sand + water
Saw dust + stones
Nitrogen + hydrogen
We separate mixtures to
Remove unwanted components
To get pure substances
Both the above
None of these
A pure substance is made up of
Only one kind of molecules
Two or more kinds of molecules
Different types of molecules
None
Identify the mixture from the following
Carbon dioxide
Iron
Hydrogen
Air
Wheat flour is separated from wheat bran by the method of
Hand picking
Sieving
Winnowing
Filtration
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
Choose the substance that shows sublimation
Napthalene
Toluene
Kerosene
Water
A mixture is a / an
Pure substance
Impure substance
Some are pure and others are impure
