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# Solved Test Paper - Is Matter Around us Pure? Class 9 Notes | EduRev

## Class 9 : Solved Test Paper - Is Matter Around us Pure? Class 9 Notes | EduRev

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Sample Papers, assignments with tips and tricks Page 1

CBSE SOLVED TEST PAPER-01
CLASS - IX Science (Is matter around us pure)
Q. What is distillation?
Ans: Distillation is a method of separating mixtures based on differences in their boiling points. The compound
which have higher boiling point will distillate later while the compound which have lowest boiling point will
distillate out first.
Q. How is blood a heterogeneous substance?
Ans: Blood is a heterogeneous mixture because it a mixture of plasma, blood cells, glucose, proteins, mineral
ions, hormones and many different salts dissolved in it. Thus the dispersed phase and dispersed medium are in
different physical state and hence a heterogeneous mixture
Q. Calculate the mass of sodium sulphate required to prepare its 20% ( mass percent ) solution in
100g of water?
Ans: Mass % of Sodium sulphate in the solution = 20%
If the total mass of the solution = 100g  Then mass of sodium sulphate = (20/100)x100 = 20 g
Mass of water = 100-20 = 80 g.
Q. Arun has prepared 0.01% ( by mass ) solution of sodium chloride in water, calculate the
composition of soltution. How do you do it ?
Ans: Mass % of solute = 0.01 % of NaCl in water
Mass % of solute = [Mass of solute in grams / Mass of solution in grams] x 100.
Let us suppose that mass of the solution is 100 g.
Therefore mass of NaCl = 0.01 g
Mass of water = 100-0.01 = 99.99 g.
Q. How to separate components from mixture containing sulphur, charcol , pottasium nitrate?
Ans: The mixture containing sulphur, charcoal and potassium nitrate can be separated by following technique:
A. Add water to the mixture. Potassium nitrate will dissolve in water. Filter the solution.
B. Filterate is solution of potassium nitrate and residue contains sulphur and charcoal.
C. Evaporate the filterate, water will vapourize leaving behind potassium nitrate.
D. To the residue containing sulphur and charcoal add carbon disulphide, this will dissolve sulphur.
E. Filter this solution.
Page 2

Sample Papers, assignments with tips and tricks Page 1

CBSE SOLVED TEST PAPER-01
CLASS - IX Science (Is matter around us pure)
Q. What is distillation?
Ans: Distillation is a method of separating mixtures based on differences in their boiling points. The compound
which have higher boiling point will distillate later while the compound which have lowest boiling point will
distillate out first.
Q. How is blood a heterogeneous substance?
Ans: Blood is a heterogeneous mixture because it a mixture of plasma, blood cells, glucose, proteins, mineral
ions, hormones and many different salts dissolved in it. Thus the dispersed phase and dispersed medium are in
different physical state and hence a heterogeneous mixture
Q. Calculate the mass of sodium sulphate required to prepare its 20% ( mass percent ) solution in
100g of water?
Ans: Mass % of Sodium sulphate in the solution = 20%
If the total mass of the solution = 100g  Then mass of sodium sulphate = (20/100)x100 = 20 g
Mass of water = 100-20 = 80 g.
Q. Arun has prepared 0.01% ( by mass ) solution of sodium chloride in water, calculate the
composition of soltution. How do you do it ?
Ans: Mass % of solute = 0.01 % of NaCl in water
Mass % of solute = [Mass of solute in grams / Mass of solution in grams] x 100.
Let us suppose that mass of the solution is 100 g.
Therefore mass of NaCl = 0.01 g
Mass of water = 100-0.01 = 99.99 g.
Q. How to separate components from mixture containing sulphur, charcol , pottasium nitrate?
Ans: The mixture containing sulphur, charcoal and potassium nitrate can be separated by following technique:
A. Add water to the mixture. Potassium nitrate will dissolve in water. Filter the solution.
B. Filterate is solution of potassium nitrate and residue contains sulphur and charcoal.
C. Evaporate the filterate, water will vapourize leaving behind potassium nitrate.
D. To the residue containing sulphur and charcoal add carbon disulphide, this will dissolve sulphur.
E. Filter this solution.

Sample Papers, assignments with tips and tricks Page 2

F. The filtrate will contain sulphur dissolved in carbon disulphide and residue will be charcoal.
G. Evaporate the filtrate, to obtain crystals of Sulphur.
Q. Acetone evaporates in normal room temp. Why do we have to heat it to its boiling point?
Ans: At room temperature the rate of evaporation of acetone is slow, to speed up the process to evaporate all
the acetone in the mixture, we supply heat.
Q. why light can’t pass through a solution?
Ans :  The size of particles in the solution is very small and when light is incident on the solution, its particles are
not able to deflect the path of light. Therefore, the path of light is not visible, when light passes through the
solution.
Q. what is difference between solution and true solution?
Ans: Solution is a mixture of solute in solvent that is homogeneous or heterogeneous. A  true solution is  a
homogeneous mixture in which  the size of particles is  very small and is not visible under a powerful microscope
.  A true solution does not scatter light.  For example, solution of salt in water.
Q. How cans a saturated solution made unsaturated?
Ans: By adding more solvent to the solution. Or, by increasing the temperature.
Q. What volume of alcohol and what volume of water must be mixed together to prepare 250 mL of
60% volume by volume solution of alcohol in water ?
Ans: Amount of alcohol in 250ml = 60% of 250 mL = (60x250) / 100 = 150 mL
Amount of water in 250ml = 250 mL - 150 mL = 100ml
Therefore 150 mL alcohol and 100 mL water should be mixed to, prepare 250 mL of 60% alcohol solution.

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