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NCERT SOLUTION CLASS 9 CHAPTER 2 (IS MATTER AROUND US PURE )  PAGE NO. 18

QUESTION NO. 1

Differentiate  between homogeneous and heterogeneous mixtures with examples.

ANSWER NO. 1

HOMOGENEOUS MIXTURE
  • Particles are uniformly distributed throughout the mixture.
  • It has a uniform composition.
  • Components cannot be separated easily.
  • Example - Solution of sugar and alloys.

HETEROGENEOUS MIXTURE

  • All the particles are completely mixed and can be distinguished with the eye or under a microscope.
  • It has a irregular composition.
  • Components can be separated easily.
  • Example - Mixture of sand and common salt, mixture of sand and water.

QUESTION NO. 2

How are sol, solution and suspension different from each other ?

ANSWER NO. 2

A sol is a heterogeneous mixture which contain physically distinct parts and have non - uniform composition.
A solution is a homogeneous mixture of two or more substances.
A suspension is a heterogenous mixture in which the solute particles do not dissolve but remain suspended throughout the bulb of the medium.

QUESTION NO. 3 

To make a saturated solution, 36g of sodium chloride is dissolved in 100g of water at 293 K. Find its concentration at this temperature.

ANSWER NO. 3


    Mass of solute = 36g
    Mass of solvent = 100g

   Mass of solution = 100+36 = 136g
Concentration of solution = Mass of solute X 100
                                                     Mass of solution
                                                   = 36  X 100
                                                      136
                                                   =  26.47%

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