CBSE Questions for Class 9 Chemistry Is Matter Around Us Pure Quiz 6 - MCQExams.com

Separation of two immiscible liquids is based on :
  • difference in the solubility of the two liquids.
  • difference in the densities of the two liquids.
  • difference in melting point of the two liquids.
  • difference in boiling point of the two liquids.
How much water should be added to 20 g of sugar to obtain 20% sugar solution?
  • 80 g
  • 20 g
  • 120 g
  • None of the above
100 ml of acetone is present in 600 ml of solution. Calculate its concentration.
  • 14.2%
  • 20%
  • 12.5%
  • 16.6%
Muddy pond water and chalk suspended in water are examples of a:
  • colloid
  • suspension
  • true solution
  • none of the above
Which of the following method is generally employed to separate the components of a solid-liquid suspension?
  • chromatography
  • filtration
  • handpicking
  • None of the above
In suspension, the size of particle is:
  • $$10^{-7}$$ m or more
  • $$10^{-10}$$ m or more
  • $$10^{6}$$ m or less
  • $$10^{2}$$ m or more
Gold used in making jewellery is a :
  • homogenous mixture
  • heterogenous mixture
  • pure substance
  • All of the above
Mark the correct statement(s).
(I) The solute particles settle down when suspension is left undisturbed.
(II) Particles of a suspension scatter a beam of light passing through it and makes its path visible.
(III) Suspension is a homogeneous mixture.
  • I, II
  • II, III
  • I, III
  • I, II, III
Mark the correct statement
(I) A suspension is not visible to the naked eye.
(II) Fine solid particles remain suspended in the medium.
(III) Coarse lime particles are example of a suspension.
  • I, II, III
  • I, II
  • I, III
  • II, III
Suspension is a non-homogeneous mixture in which very fine particles of .................. are dispersed in .................
  • solid/liquid, gas/solid
  • gas, liquid
  • solid, liquid/gas
  • solid/liquid/gas, liquid
A heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of medium is known as a :
  • pure solution
  • suspension
  • colloid
  • none of the above
Mark the correct statement
(a) Particles in a suspension have a tendency to settle down.
(b) Particles in a suspension can be seen with naked eyes.
(c) Particles in a suspension can't be seen under a simple microscope.
  • a, b, c
  • a, b
  • a, c
  • b, c
Sulphur powder and iron filings is an example of:
  • homogenous mixture
  • heterogeneous mixture
  • compounds
  • All of the above
Colloid is a:
  • homogeneous mixture
  • heterogeneous mixture
  • supersaturated solution
  • none of the above
Kerosene is an example of :
  • homogeneous mixture
  • heterogeneous mixture
  • both A and B
  • none of the above
Which of the following is a characteristic feature of a pure substance?
  • Substances with uniform composition throughout
  • Substances that always have the same colour throughout
  • Substance that always have the same taste throughout
  • All of the above
Mark the incorrect statement.
  • The solute particle can be separated from the mixture by the process of filtration.
  • Solute particles settle down when left undisturbed.
  • Solution is unstable.
  • All of the above
Why is sugar a compound?
  • Because the composition is not fixed
  • Because it's composition is fixed
  • Because it is crystalline in nature
  • Because it is soluble in water
Among the following, identify the mixtures:

Soil, silver, tin, air
  • Soil
  • Silver, tin, air
  • Soil, air
  • All are mixtures
Sugar obtained from dates and sugarcane are mixed. Then :
  • it will be a mixture.
  • it will be a pure substance.
  • it will be a colloid.
  • none of these.
A process that separates a pure solid in the form of its crystals from a solution is known as :
  • centrifugation
  • crystallization
  • distillation
  • none of the above
In the process of crystallisation, crystals formed by different substances :
  • are of same shapes and colours
  • are of different shapes and colours
  • shape and colour depends upon the amount of solute present
  • can't be predicted
Tincture of iodine is:
  • iodine in water
  • iodine in alcohol
  • iodine in sugar
  • iodine in kerosene
How can we obtain coloured component from blue/black ink?
  • By distillation
  • By evaporation
  • By sedimentation
  • By centrifugation
Seperation of dye from blue/black ink via evaporation is:
  • solute-solute separation
  • solvent-solvent separation
  • solute-solvent separation
  • all of the above
While separating dye from blue/black ink, what do you think which has got evaporated from watch glass?
  • Solute, i.e. dye
  • Solvent, i.e. dye
  • Solute, i.e. water
  • Solvent, i.e. water
What is the basic concept used in separating a dye from blue/black ink?
  • A volatile component can be separated from a non-volatile component
  • Two substances that differ in their molecular weight can be separated
  • Two substances which differ in their densities can be separated
  • All of the above
In the experiment that we do for separating dyes in black ink using chromatography, which component of colour rises faster on the filter paper?
  • Coloured component that is comparatively less soluble in water
  • Coloured component that is more soluble in water
  • The one which is lighter in weight
  • The one that has less affinity for water
Mark the correct statement regarding "solution".
  • Particle of a solution are larger than 1 nm in diameter.
  • They do not scatter a beam of light passing through them.
  • The path of light is visible in a solution.
  • None of the above
How can you prove that dye in a black ink is a mixture of many colors?
  • By evaporation
  • By sedimentation
  • By chromatography
  • All of the above
Identify the heterogeneous mixture among the following:
Brass, common salt and sulphur, water and oil, aerated water, steel
  • Common salt and sulphur, Water and oil
  • Brass, Aerated water, Steel
  • Common salt and sulphur, Steel, Brass
  • All of the above
Why crystallisation is used as a method of obtaining pure $$CuSO_4$$ from impure sample?
  • Because $$CuSO_4$$ is a liquid
  • Because $$CuSO_4$$ is a crystalline solid
  • Because $$CuSO_4$$ is a gas
  • None of the above
The components of air can be separated because of the difference in their :
  • boiling and freezing point
  • molecular mass
  • density
  • None of the above
Pure copper sulphate $$(CuSO_4)$$ can be obtained from an impure sample by :
  • crystallization
  • galvanization
  • centrifugation
  • sedimentation
While obtaining pure copper sulphate from an impure sample by crystallization method what will finally be obtained in the china dish?
  • Impurities of the sample are left behind in the china dish
  • Crystals of Copper sulphate
  • Water droplets
  • Chine dish remains empty
The mixture of acetone and water is separated by :
  • distillation
  • fractional distillation
  • centrifugation
  • decantation
Mark the statement which is included in the process of separating oxygen gas from air.
(I) All other gases are separated from air.
(II) The air is compressed by increasing the pressure.
(III) The air is cooled by decreasing the temperature to get liquid air.
  • I, II
  • II, III
  • I, III
  • I, II, III
While doing chromatography using black ink, the results seen is/are:
(a) black ink is a mixture of red, green, and blue colours.
(b) ink is a mixture of dye and water.
  • a only
  • b only
  • Both A and B
  • None of these
Mark the incorrect statement
  (I) Fractionating column is a long tube.
 (II) Fractionating column is provided with obstructions to the passage of vapours upwards and to the liquids downward.
(III) Column itself is fitted with a thermometer.
  • I, II, III
  • I,II
  • I, III
  • None of the above
Mark the statement which is not true for fractional distillation of air.
  • Different gases get separated at different heights
  • Air is cooled and then warmed
  • Nitrogen gas distills out first
  • All are correct
Why is crystallisation is used for obtaining pure copper sulphate from an impure sample rather than evaporation?
  • The impurities left after filtration may contaminate copper sulphate on evaporation.
  • Because crystallisation is comparatively easier than evaporation
  • Because crystallisation is comparatively faster
  • All of the above
A liquid is contaminated with non-volatile impurities. Suggest method of purification.
  • Sedimentation
  • Distillation
  • Centrifugation
  • Evaporation
A solvent may be:
  • solid
  • liquid
  • gas
  • All of the above
The component of the solution that is dissolved in the solvent is called ?
  • dispersed phase
  • dispersion medium
  • solute
  • solvate
Mark the correct property and identify the substance.

The substances whose constituents can be separated by chemical or electrochemical reactions have the following properties. 
  • Mixture, it has a valuable composition
  • Mixture, the new substance having totally different properties
  • Compound, elements reacts to form new compounds
  • All the above
Mark the correct statement:

(I) Two elements combine in more than a way to give a number of compounds.
(II) Compounds are heterogeneous.
(III) It is obtained by a chemical combination of two or more elements in a definite proportion by mass.
  • I is correct
  • I, II are correct
  • II, III are correct
  • I, III are correct
In a sugar solution, which component is a solvent?
  • Water
  • Sugar
  • Both sugar and water
  • None of the above
Elements react to form new compounds and the composition of new substance in the compound is :
  • variable
  • fixed
  • Can't say
  • depends on number of neutron
Two liquids having different boiling point can be separated by :
  • distillation
  • decantation
  • sedimentation
  • evaporation
In soda water, identify the solvent?
  • Water
  • Carbon dioxide
  • Sulphur dioxide
  • Alcohol
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