NCERT Class – 9 Science solution: Chapter 2 Is Matter Around Us Pure-Part 11

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Question 40:

You are provided with a mixture containing sand, iron filings, ammonium chloride and sodium chloride. Describe the procedures you would use to separate these constituents from the mixture?


  • Separate iron filings with the help of a magnet

  • Sublimation of the remaining mixture separates ammonium chloride

  • Add water to the remaining mixture, stir and filter

  • The filtrate can be evaporated to get back sodium chloride

Image of Sublimation

Image of Sublimation

Image of Sublimation

Question 41:

Arun has prepared (by mass) solution of sodium chloride in water. Which of the following correctly represents the composition of the solutions?

Answer: C

Question 42:

Calculate the mass of sodium sulphate required to prepare its (mass percent) solution in of water?


Let the mass of sodium sulphate required be

The mass of solution would be

of solute in of solution

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