1. Which of the following is NOT true about colloids?
A.Particles in a colloid can pass through filter paper.
B.A colloid is a homogeneous solution.
C.Colloidal particles exhibit Brownian motion.
D.Colloidal particles exhibit electrophoresis.
2. Which of the following is a heterogeneous mixture?
A.air
B.brass
C.sugar dissolved in water
D.lime water
3. How can we separate cream from milk?
A.Centrifugation
B.Chromatography
C.Sublimation
D.Distillation
4. Removal of clear layer of the liquid without disturbing the settled solid is known as __________.
A.Sedimentation
B.Decantation
C.Filtration
D.Evaporation
5. A mixture of water and silver chloride can be separated by
A.Centrifugation
B.Sedimentation
C.Filtration
D.Sublimation
6. When two liquids in a mixture differ by their boiling points, which of the following is the best method to separate these liquids?
A.Evaporation
B.Distillation
C.Chromatography
D.Filtration
7. Solution which has uniform composition throughout is called ___________.
A.homogeneous solution
B.heterogeneous solution
C.Colloidal solution
D.none of these
8. The particles of a suspension will be of size ________
A.less than 1nm (nm = Nano metre)
B.between 1nm to 100 nm
C.greater than 100nm
D.less than 0.1 nm
9. Which of the following is a chemical change?
A.Melting of ice
B.Dissolving salt in water
C.Rusting of iron
D.Boiling of water into steam
10. Which one of the following is TRUE for compounds?
A.It shows properties of its constituents.
B.It may be homogeneous or heterogeneous.
C.It can be separated by physical methods.
D.It has fixed melting and boiling point.
Answers will be provided soon
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