To separate a mixture of two or more gases ______ method is used.
Sedimentation
Liquification
Distillation
Decantation
From the following which one is not a mixture.
Alum
A platinum bangle
A gold chain of 22 ct.
Blank ink
Choose the substance that shows sublimation
Napthalene
Toluene
Kerosene
Water
The following property is used to find the purity of a substance
Specific gravity
Volume
Temperature
Mass
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
When distilled water is evaporated
Some salt is left behind
Some sand in left behind
Some oil is left behind
Nothing is left behind
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
Wheat flour is separated from wheat bran by the method of
Hand picking
Sieving
Winnowing
Filtration
Pure substances possess
Variable melting points and boiling points
Nonuniform
Variable properties
Fixed melting points and boiling points
