CBSE Class 9 Science Is Matter Around Us Pure Worksheet Set 09

Question : List the points of differences between homogeneous and heterogeneous mixtures.
Answer :
Homogeneous mixture
Its constituent’s particles cannot be seen easily.
There are no visible boundaries of separation in a homogeneous mixture.
Its constituents cannot be easily separated.
Examples: Alloys, solution of salt in water etc.
Heterogeneous mixture
Its constituent particles can be seen easily.
Have visible boundaries of separation between the constituents.
Its constituents can be separated by simple methods.
Examples: Mixture of sand and common salt, mixture of sand and water etc.

Questions : How are sol, solution and suspension different from each other?
Answer :
Solution or true solution is homogeneous.
NO Tyndall effect.
Solute particles cannot be filtered by using a filter paper
True solution is transparent.
Examples: Sea water, alloys, solution of lemon juice in water etc.
Sol (colloidal solution) :
Sol or colloidal solution is heterogeneous.
Tyndall effect.
Cannot be separated by ordinary filter paper.
It may be transparent or translucent.
Examples: Milk of magnesia, cough syrup, mist, fog, clouds, smoke, mud etc.
Suspension :
Suspension is also heterogeneous.
Tyndall effect.
It may be transparent or translucent.
Separated easily by filter paper.(because of large particles)
Examples: Mixture of sand in water, mixture of chalk in water.