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

Why is crystallization better than evaporation to dryness?
  • Solids get charred in evaporation
  • Solids get decomposed in evaporation
  • Impurities do not get removed in evaporation
  • All of above
An installation for distillation, especially of alcohol is a:
  • still
  • distillery
  • distillation column
  • both $$A$$ and $$C$$
Steam distillation is a method for distilling compounds which are:
  • water soluble
  • liquids with close boiling points
  • heat sensitive
  • all of the above
Choose the correct statement from the following:
  • Oil is miscible in water.
  • Fractional distillation is a method used for separating homogeneous mixture of two liquids.
  • All pure substances are homogeneous in nature.
  • The constituent elements of a compound can be separated only by chemical reactions.
Distillation is a process of separating the component substances from a liquid mixture by:
  • Selective evaporation
  • Condensation
  • both $$A$$ and $$B$$
  • none of the above
If the boiling points of two liquids is close to each other, they are separated by:
  • fractional distillation
  • chromatography
  • steam Distillation
  • differential Extraction
Distillation works when liquids have:
  • same melting points
  • different melting points
  • different boiling points
  • Both $$B$$ and $$C$$
The liquids boiling under ordinary conditions of temperature and pressure without decomposition and have sufficient difference in their boiling points are separated using:
  • steam distillation
  • simple distillation
  • fractional distillation
  • All of the above
Which of the following is a homogeneous solution?
  • Muddy water
  • Bread
  • Concrete
  • Sugar solution
What kind of solution is milk?
  • Suspension
  • Colloid
  • True solution
  • Alloy
In fractionating column:  
  • vapours of high boiling point substance condense and fall back into a distillation flask
  • vapours of low boiling point substance condense and fall back into a distillation flask
  • vapours of high boiling point substance condense and evaporate
  • both $$B$$ and $$C$$
Because they have different boiling points, the substances in crude oil can be separated using:
  • chromatography
  • fractional distillation
  • sublimation
  • magnetic separation
In which of the following does scattering of light takes place?
  • Electrolytic solutions
  • Colloidal solutions
  • Electrodialysis
  • Alcoholic solutions
If we put camphor in an open container, its amount keeps on decreasing due to the phenomenon of
  • Evaporation
  • Sedimentation
  • Condensation
  • Sublimation
Simple distillation is effective only when the:
  • liquid boiling points are too close
  • liquids have very low boiling points
  • liquid boiling points differ greatly
  • liquids are heat sensitive
What type of mixture is steel?
  • Solid-liquid heterogeneous mixture
  • Solid-solid heterogeneous mixture
  • Solid-solid homogeneous mixture
  • None of these
Which of these statements is/are true?
  • The components of a suspension can be separated by filtration.
  • The particles of a colloid can pass through a filter paper.
  • The constituents of a compound can be separated by physical methods.
  • Both (A) and (B).
Which of these is the solvent used in the case of an 'aqueous' solution?
  • Benzene
  • Ethanol
  • Water
  • Acetone
  • None of these
Which of the following describe water?
i. Solvent for polar solutes
ii. Polar molecule
iii. Good conductor of electricity
  • i, ii and iii
  • i and ii
  • ii and iii
  • i only
  • iii only
How can sugar from sugar solution be separated?
  • By distillation
  • By winnowing
  • By sublimation
  • By filtration
Solid solutions also exists.
  • True
  • False
Which of the following processes of separating substances involves both evaporation and condensation?
  • Filtration
  • Crystallisation
  • Distillation
  • Sedimentation
The technique utilized to separate a mixture of liquids based on the difference in their boiling points is
  • distillation
  • chromatography
  • crystallization
  • filtration
  • none of these
When a solution is formed, there are attractions between the solute and the solvent.
Consider a solution formed when solid potassium chloride is dissolved completely into liquid water.
Which of the following particle diagram CORRECTLY represents the way that the particles of the solute (potassium chloride) form attractions toward the molecules of the solvent (water)?
Ionic solids do not sustain/conduct an electric current in the solid-state but do sustain/conduct an electric current when dissolved in water because:
  • ionic solutes create conductive molecules with water.
  • ionic solutes dissociate in water, creating free moving ions.
  • ionic solutes release electrons when dissolved in water.
  • none of the above.
What is the principle of crystallisation?
  • Differences in densities of the components is used for separation.
  • Differences in boiling point of the components is used for separation.
  • Differences in solubilities of the components is used for separation
  • None of these
Which method is used to obtain copper sulphate from an impure sample?
  • Hand-picking
  • Fractional Distillation
  • Crystallisation
  • None of the above
The mixture in which one substance of microscopically dispersed insoluble particles is suspended throughout another substance is called _______.
  • colloidal solution
  • saturated solution
  • unsaturated solution
  • None of above
Statement I (Assertion): Iron is an element.
Statement II (Reason): It cannot be broken into smaller units that retain its physical and chemical properties.
  • Assertion and reason both are correct statements and reason is correct explanation for assertion.
  • Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  • Assertion is correct statement but reason is wrong statement.
  • Assertion is wrong statement but reason is correct statement.
  • Both statements are wrong.
Usually crystals are dried with help of ________.
  • dryer
  • autoclave
  • filter paper
  • fan
Air is to convert into liquid air by __________. 
  • increasing pressure
  • decreasing temprature
  • Both A and B
  • None of these
Pure substances always have fixed ________.
  • Chemical formula
  • Pressure
  • Volume
  • Temperature
Ink is a _______  ?
  • Suspension
  • Colloidal solution
  • True solution
  • None of these
Depending upon their boiling point different gases from air separated from _____________.
  • same heights
  • different heights
  • less heights
  • none of these
How can we obtain coloured component from blue/black ink? 
  • Distillation
  • Filtration
  • Evaporation
  • None of these
Baking soda is an example of pure substance because:
  • the constituent particles have constant composition.
  • it has consistent properties through out the mixture.
  • both A and B
  • none of these
Elements and compounds are the type of ___________. 
  • Pure substance
  • Impure substance
  • Both a and b
  • None of these
Fractional distillation is performed on which of the following?
  • liquid air
  • gaseous air
  • both a and b
  • none of these
On separation of oxygen gas from air, its percentage obtained is ______________. 
  • 25%
  • 20.9%
  • 17%
  • None of these
Identify impure substance.
  • Fruit Juices
  • Sugar Solution
  • Alcohol in water
  • All of these
% by volume of argon gas produced on fractional distillation of air is _____________.
  • 0.9%
  • 0.145%
  • 0.23%
  • None of these
Ink is the mixture of :
  • dye, water
  • dye, alcohol
  • dye, phenol
  • dye, benzene
Separation of blood is done by ________.
  • centrifugation
  • distilliation
  • filteration
  • all of these
What is disperse phase in ink?
  • Solid
  • Liquid
  • Gas
  • None of these
A compound is a pure chemical substance made of two or more different chemical:
  • material
  • element
  • composition
  • particle
A miscible mixture of $$C_6H_6+CHCl_3$$ can be separated by:
  • sublimation
  • distillation
  • filtration
  • crystallisation
Substance that is able to get dissolved in solvent is said to be:
  • solute
  • insoluble
  • solvent
  • soluble
During separation of the colored components from the ink if evaporation does not work , the other technique used is ___________.
  • Centrifugation
  • Filtration
  • Distillation
  • None of these
Colored components from the dye are separated by which of the following techniques? 
  • Evaporation
  • Centrifugation
  • Paper chromatography
  • All of these
A technique in which two liquids are separated by heating process is known as:
  • distillation
  • chromatography
  • filtration
  • evaporation
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