English Medium Class 9 - CBSE Question Bank Solutions for Science

Three mixtures A, B and C are obtained by stirring three different solids in water taken in separate beakers. When mixture A is allowed to stand for some time, then its particles settle at the bottom of the beaker. When a beam of light is passed through mixture A in a dark room, the path of light becomes visible when observed from the side of the beaker. When mixture B is allowed to stand for a considerable time, even then its particles do not settle down. Mixture B, however, scatters the beam of light just like mixture A. The particles of mixture C do not settle down on keeping and it also does not scatter a beam of light passing through it.

What are the mixtures like A known as ?

What are the mixtures like B known as ?

What are the mixtures like C known as ?

Name the phenomenon exhibited by A and B which occurs on passing a beam of light through them.

Name one mixture each which is like (i) A (ii) B, and (iii) C.

Name the solvent you would use to separate a mixture of sulphur and carbon.

Name the process you would use to separate ammonium chloride from a mixture of sodium chloride and ammonium chloride.

Which method can be used to separate a mixture of naphthalene and common salt ?

Name the process you would use to separate a mixture of anthracene and copper sulphate ?

Name the property of any one of the components which can be used for separating the following mixture :

Salt and Camphor

Name the process you would use to separate a mixture of two miscible liquids (like acetone and water).

Name one pair of substances whose mixture can be separated by fractional distillation.

Name any two solid substances whose mixture can be separated by sublimation.

Name one pair of substances whose mixture can be separated completely by distillation.

How will you separate a mixture of chalk powder and water?

Write down the composition of air.

Name the quantity whose unit is :
(a) kilowatt
(b) kilowatt-hour

How does oxygen and carbon dioxide remain nearly constant in the atmosphere?