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
From the following which one is not a mixture.
Alum
A platinum bangle
A gold chain of 22 ct.
Blank ink
Which of the following property is not considered when the components of a mixture is separated ?
Density
Energy - change
Volatile nature
Boiling point
To separate a mixture of two or more gases ______ method is used.
Sedimentation
Liquification
Distillation
Decantation
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
A pure substance is made up of
Only one kind of molecules
Two or more kinds of molecules
Different types of molecules
None
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
