CBSE Questions for Class 9 Chemistry Is Matter Around Us Pure Quiz 1 - MCQExams.com

In brass,
  • zinc is the solvent and copper acts as solute.
  • copper acts as solvent and zinc acts as solute.
  • copper and zinc both act as solutes.
  • copper and zinc both act as solvents.

Which technique is used to separate the components of liquid air?
  • Fractional distillation
  • Simple distillation
  • Centrifugation
  • Evaporation

Why do we use fractional distillation instead of simple distillation for separating the components of air?
  • Because fractional distillation is cheaper
  • Because fractional distillation is easier to use
  • Because the difference in boiling point of components are less than $$20\ K$$
  • Because the difference in melting point of components are less than $$20\ K$$
Distillation involves :
  • the conversion of a liquid into its vapors upon heating and then cooling the vapor back into liquid.
  • separation of a mixture in which one component is liquid and other is an insoluble solid heavier than liquid.
  • separation of a non-volatile soluble salt from a liquid.
  • none of these.

Which of the following statement is incorrect about compound?
  • A compound is a pure substance composed of two or more elements
  • A compound is combined chemically in fixed proportion
  • A compound is combined chemically in variable proportion
  • All compounds are molecules, but not all molecules are compounds
Two liquids having different boiling points can be separated by :
  • distillation
  • separating funnel
  • centrifugation
  • crystallization
Liquids which do not dissolve in each other are called:
  • miscible liquids
  • immiscible liquids
  • dissociated liqids
  • None of the above
Pure substances consists of :
  • one type of particles
  • more than one type of particles
  • many types of particles but their chemical properties should be same
  • All of the above
Which property of colloids is not dependent on the charge on colloidal particles?
  • Coagulation
  • Electrophoresis
  • Electro-osmosis
  • Tyndall effect
Syrup is an example of :
  • an element
  • a mixture
  • a compound
  • none of these
Water, ice, and steam are all:
  • elements
  • mixtures
  • compounds
  • none of these
What process would you use to separate and then collect alcohol (b.p. $$78^{\circ}C$$) from a mixture of alcohol and water ?
  • Distillation
  • Filtration
  • Chromatography
  • Sublimation
Fog can be defined as:
  • Smoke from cigarette
  • Polluted air from vehicles
  • Clouds forming close to the ground
  • A combination of smoke and dust particles
A mixture of sodium chloride and $${H_2O}$$ can be separated by:
  • Filteration
  • Handpicking
  • Evaporation
  • Distillation
Give examples of the following : Solution of a liquid in  liquid  is 
  • alcohol in water
  • milk
  • smoke
  • none of these
Solution equals:
  • solute + solvent
  • solution - solute
  • solution - solvent
  • none of these
We sprinkle water in a dirty room before sweeping because:
  • water makes sweeping easier
  • water repels dust particles
  • water coagulates the dust particles
  • sprinkling water is fashionable
Mixtures in which components can be distinguished are called :
  • heterogeneous
  • homogeneous
  • pure substances
  • solutions
While separating oil and water, which component forms the upper layer?
  • Oil
  • Water
  • Both A and B
  • Air
Oil and water can be seperated by:
  • separating funnel
  • sedimentation
  • centrifugation
  • None of the above
We can get a pure liquid from a solution by:
  • evaporation
  • crystallisation
  • filtration
  • distillation
Which of the following method is used for the separation of different components of petroleum?
  • Fractional distillation
  • Sublimation
  • Chromatography
  • Simple distillation
Zig-zag motion of the solute particle in a solution is known as :
  • linear motion
  • brownian motion
  • circular motion
  • curved motion
Pure substances means:
  • all its constituent particles have same physical property
  • all its constituent particles have same chemical property
  • both A and B
  • none of these

Which of the following can be classified under pure substances?
  • Sodium chloride
  • Water
  • Sugar
  • All of the above
Mixture with different compositions and different properties at different locations in the mixture is called a:
  • homogeneous mixture
  • heterogeneous mixture
  • Both A and B
  • None of the above
Air can be separated into its components by :
  • crystallisation
  • fractional distillation
  • sedimentation
  • none of the above
Air is a ______ mixture.
  • homogeneous
  • heterogeneous
  • both A and B
  • none of the above
Distillation is used for liquids having:
  • volatile impurities
  • non-volatile impurities
  • both A and B
  • none of the above
In a solution of ethyl alcohol in water,
  • ethyl alcohol is the solute and water is the solvent.
  • water is the solute and ethyl alcohol is the solvent.
  • ethyl alcohol acts as both solute and solvent.
  • All of the above
Process used for separating two miscible liquids that boil without decomposition and have sufficient difference in their boiling point is:
  • centrifugation
  • distillation
  • chromatography
  • All of the above
Two main constituents of air are:
  • oxygen and nitrogen
  • carbon dioxide and nitrogen
  • rhodium and nitrogen
  • oxygen and calcium
What is a dye?
  • Pure substance
  • Compound
  • Mixture
  • None of the above
During separation of components of air, $$CO_2$$ comes out as:
  • gaseous $$CO_2$$
  • dry ice
  • solid $$CO_2$$
  • all of the above
A mixture perfectly uniform in its composition and properties throughout its bulk is called:
  • homogeneous mixture
  • heterogeneous mixture
  • Both A and B
  • None of the above
In distillation process, vapours formed gives :
  • impurity
  • pure liquid
  • water
  • none of the above
The composition of a mixture can not be seen even under a powerful microscope. Then the given mixture is ____________.
  • homogeneous
  • heterogeneous
  • both A and B
  • none of these
Component present in larger amount in solution is known as:
  • solvent
  • solute
  • dispersed phase
  • none of the above
Most commonly used solvents are:
  • solids
  • liquids
  • gases
  • all of the above
In compounds, different elements of matter, like atoms and ions, combine together in
  • Fixed proportions
  • Irregular proportions
  • Unequal ratios
  • Both a and b
The substance in which solute is dissolved is known as :
  • solution
  • solvent
  • dispersed phase
  • none of the above
A solution is defined as a:
  • homogeneous mixture of two or more substances
  • heterogeneous mixture of two or more substances
  • homogeneous mixture of liquid and solid components only
  • homogeneous mixture consisting of water as one of the components
Which one of the following is a pure substance?
  • Tap water 
  • Rock 
  • Air
  • Elemental oxygen
A pure substance is:
  • heterogenous.
  • homogenous.
  • both A and B
  • none of the above
Gum is an example of :
  • Mixture
  • Colloid
  • Suspension
  • Element
The method by which we separate a mixture of pure liquids based on the difference in their boiling points is known as:
  • Decantation
  • Distillation
  • Fractional crystallization
  • Hydration
Which of the following are impure substances?
  • elements
  • compounds
  • mixtures
  • none of these
The basic form of matter which cannot be further subdivided into simpler substances is called as ______.
  • compound
  • element
  • mixture
  • None of these
Which of the following is impure substance?
  • salt
  • sugar
  • milk
  • sulpuric acid
_________is present in a lesser amount in a solution.
  • Solute
  • Solvent
  • Solubility
  • Aqueous solution
  • Solvation
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