CBSE Questions for Class 9 Chemistry Is Matter Around Us Pure Quiz 7 - MCQExams.com

In ammonium chloride water solution, which component is said to be the solvent?
  • Water
  • Ammonium chloride
  • Ammonium and chloride ions
  • None of the above
A solution in which solvent is liquid but solute is solid is :
  • sugar in water
  • urea in water
  • ammonium chloride in water
  • all of the above
In an emulsion, dispersion medium is :
  • Solid
  • Gas
  • Liquid
  • None of the above
The solute particles in a true liquid solution:
  • settle down
  • spread uniformly throughout
  • float on the surface
  • None of the above
The component of the solution that is usually present in lesser quantity is called :
  • solute
  • solvent
  • dispersing medium
  • none of the above
Which is/are the correct statement(s) among the following: 
I) A true solution is clear and transparent.
II) A true solution does not scatter light.
III) Components of a true solution cannot be separated by filtration.
  • I
  • I, II
  • I,III
  • I, II, III
A solution in which the solute is a gas will be :
  • soda water
  • limewater
  • milk
  • all of the above
What are the following ways of expressing concentration of a solution called?

I) $$\dfrac{Mass \ of\  solute}{Mass\  of\  solution} \times 100$$

II) $$\dfrac{Mass\  of\  solute}{Volume\  of \ solution} \times 100$$
  • (I) Mass by mass percentage, (II) Mass by volume percentage
  • (I) Volume by volume percentage, (II) Mass by volume percentage
  • (I) Mass by volume percentage, (II) Volume by volume percentage
  • None of the above
Colloids are classified on the basis of :
  • Nature of dispersed phase and dispersion medium
  • Phase of solution
  • Temperature of solution
  • None of the above
In smoke, cheese, milk of magnesia and fog, the dispersion medium is :
  • gas, solid, liquid, and gas respectively
  • liquid
  • liquid, gas, solid, and liquid respectively
  • gas
A solution in which both solute and solvent are liquids is:
  • ethanol in water
  • sugar in water
  • carbon dioxide in water
  • urea in water
During hearing of a court case, the judge suspected that some changes in the document had been carried out. He asked the forensic department to check the ink used at two different places. According to you, which technique can give the best results?
  • Column Chromatography
  • Solvent extraction
  • Distillation
  • Thin layer chromatography
Foam is a:
  • true solution
  • colloid
  • emulsion
  • gel
A solution of two liquids whose boiling points are about $$30^{\circ}C$$ different can be seperated by the method of :
  • sublimation
  • distillation
  • sedimentation
  • evaporation
Distillation is a process of separating the component substances from a liquid mixture by:
  • filteration and condensation.
  • condensation and evaporation.
  • evaporation and filtration.
  • all of above
A _____ is a mixture of two or more substances in a single phase.
  • Element
  • Compound
  • Solution
  • None of above
The constituents of the mixture are easily seen with naked eyes. Then the mixture is ____________.
  • Homogenous
  • Heterogenous
  • Both (a) and (b)
  • None of these

The components of liquid air on passing through a fractional distillation column separate based on:
  • melting point
  • boiling point
  • specific heat
  • density
Suspensions are different from colloids because:
  • the particles of suspensions settle down.
  • the particles of suspensions do not settle.
  • solvent and solute of suspension are homogenously mixed.
  • Both A and C
Which of the following is a property of a pure substance?
  • It can be separated into two or more substance by physical means
  • It is heterogeneous in nature
  • It has a fixed chemical composition
  • Its composition can be varied

Which of the following is a property of compound?
  • A compound can be broken into its constituents.
  • A compound has a fixed composition.
  • A compound has a distinct set of properties that is not similar to the properties of its constituent elements.
  • All of the above
In fractional distillation, difference in boiling points of components should be:
  • $$25^oC$$
  • more than $$25^oC$$
  • less than $$25^oC$$
  • less than $$35^oC$$
Which of the following is an example of pure substance?
  • Pure water
  • Gold
  • Table salt
  • All of the above
A suspension is a 
  • Homogenous mixture
  • Heterogenous mixture
  • Heterogenous compound
  • Solution
A pure substance is composed of :
  • one type of particle.
  • two different particles.
  • more than two particles.
  • none of the above.

In fractional distillation one or more fractions of compound will:
  • Vaporize
  • Melt
  • Solidify
  • all of above
_______________ contains solid particles that are sufficiently large for sedimentation.
  • Pure substance
  • Element
  • Suspension
  • Solution
If a liquid is suspended in another liquid, it is called:
  • emulsion
  • aerosol
  • colloid
  • particulate
The colored component in blue-black ink are separated through chromatography because:
  • The colored component soluble in water rises faster
  • The colored component insoluble in water rises faster
  • The colored component soluble in water rises slowly
  • None of above
The air is compressed and cooled to get:
  • solid gas
  • liquid air
  • gaseous air
  • condensed air
A suspension of liquid droplets or fine solid particles in a gas is called :
  • aerosol
  • emulsion
  • foam
  • colloid
The method used to separate the volatile component(solvent) from its non-volatile solute is called:
  • filtration
  • evaporation
  • condensation
  • sublimation
In ink, _______ acts as solvent and ________ as solute.
  • dye, water
  • water, water
  • water, dye
  • none of the above
Which of the following is an example of suspension?
  • Milk
  • Water
  • Sand in water
  • All of the above
To separate gases by fractional distillation:
  • pressure is increased, temperature decreased
  • pressure decreased, temperature increased
  • pressure and temperature increased
  • pressure and temperature decreased
In fractional distillation, the cooled and compressed air is passed through:
  • condenser
  • centifuge
  • separator
  • None of the these
Suspensions transmit light.
  • True
  • False
Which of these is not a colloid?
  • Muddy water
  • Milk
  • Jelly
  • Fog
Which of the following gas is collected at the top in fractional distillation?
  • Oxygen
  • Argon
  • Nitrogen
  • Hydrogen
Paste is:
  • a suspension of a solid in a liquid.
  • mechanical dispersion of a solid in a liquid.
  • colloidal solution of a solid in a solid.
  • None of the above
Which of the following is a metal?
  • Sodium
  • Chlorine
  • Carbon
  • Fluorine
Out of the following, which gas is collected from the bottom of the fractionating column during fractional distillation of air?
  • Oxygen
  • Argon
  • Nitrogen
  • Hydrogen
The liquid air in fractional distillation method separates depending on :
  • melting point
  • density
  • volume
  • boiling point
Which of the following is intermediate between suspension and solution?
  • Mixture
  • Colloid
  • Element
  • Solvent
A suspension of liquid droplets or fine solid particles in a gas is called as:
  • aerosol
  • foam
  • emulsion
  • gel
Which of the following is true about distillation?
  • Formation of products occur.
  • There's a change in state of reactants.
  • It is a chemical reaction.
  • It is not a chemical reaction.
Suspension is a: 
  • compound
  • heterogeneous mixture of two or more substances
  • homogeneous mixture of two or more substances.
  • none of above
Which of the following has liquid as a dispersing medium?
  • Aerosol
  • Gel
  • Foam
  • Cranberry glass
Why are suspensions not stable?
  • Particles are very small
  • Particles settle at the bottom
  • Particles do not settle
  • Particles mix homogeneously
Suspension shows Tyndall effect because of :
  • large size of particles
  • small size of particles
  • their settling down nature
  • none of above
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