CBSE Questions for Class 9 Chemistry Is Matter Around Us Pure Quiz 8 - MCQExams.com

State whether the statement is true or false.
Statement: Milk is a pure substance. 
  • True
  • False
Which of the following is not a property of pure substances?
  • Homogenous
  • Definite composition
  • They have fixed melting and boiling points
  • They can be broken down into simpler substances by physical means
Separating funnel is used for :
  • separation of miscible liquids
  • separation of immiscible liquids
  • separation of immiscible gases
  • all of above
Crystals of pure copper sulphate are separated from the solution by :
  • condenstaion
  • distillation
  • solidification
  • filtration
Which of the following turns into gas first and separates from air?
  • Nitrogen
  • Oxygen
  • Argon
  • Helium
Which of the following is a compound?
  • Hydrogen sulphide
  • Stainless steel
  • Bronze
  • Graphite
Crystallization is a process of :
  • cooling a hot concentrated solution of a substance to obtain beads
  • cooling a hot concentrated solution of a substance to obtain crystals
  • heating a solution to obtain beads
  • all of the above
Which of the following gas is removed from air during liquefaction stage?
  • Oxygen
  • Carbon dioxide
  • Hydrogen
  • Nitrogen
Salt, sugar, and many other substances dissolve in water to form:
  • homogenous mixture
  • heterogenous mixture
  • Ionic compound
  • molecular compound
Fractional distillation can be used to separate components of air by:
  • heating and applying pressure
  • cooling and decreasing pressure
  • cooling and increasing pressure
  • heating and decreasing pressure
The first step in fractional distillation relies on :
  • compression
  • cooling
  • solidification
  • Both A and B
Energy is given off or absorbed in case of:
  • Compounds
  • Mixtures
  • Both A and B
  • None of above
Purity of water can be checked by :
  • Distillation
  • Separating funnel
  • Centrifugation
  • None of above
Which of the following statement is false regarding mixtures?
  • Salads are heterogeneous mixtures
  • $$NaCl(aq)$$ is a homogeneous mixture
  • Milk is a homogeneous mixture
  • Sand and water make a heterogeneous mixture
  • Pure iron is a heterogeneous mixture
X and Y are liquids with unequal densities. Which method can be employed to separate them?
  • Handpicking
  • Chromatography
  • Distillation
  • Separating funnel
The process of _________ is used to separate the component from a solid-solid mixture which _________ on heating and the other component being non-volatile.
  • sublimation, soluble
  • sublimation, sublimes
  • chromatography, soluble
  • centrifugation, sublimes
Fractional distillation involves :
  • condensation
  • evaporation
  • both a and b
  • none of above
Which of the following represents a homogeneous mixture?
  • $$CH_{3}OH(l)$$
  • $$CH_{3}OH(aq)$$
  • $$CH_{3}OH(g)$$
  • $$CH_{3}OH(s)$$
  • None of the above
Liquid ethanol can be separated from a mixture of ethanol and water by:
  • chromatography
  • fractional distillation
  • centrifugation
  • all of the above
Copper sulphate dissolved in water can be recovered as solid by:
  • Evaporation
  • Filtration
  • Centrifugation
  • All of above
Crystallization is used to separate :
  • solid from solid
  • liquid from solid
  • solid from liquid
  • all of above
Which of the following method depends upon difference in boiling point?
  • Magnetic separation
  • Centrifugation
  • Chromatography
  • Distillation
During the process of distillation, in which of the following lab equipment does the evaporation of the mixture takes place according to the setup shown in the figure?
480829_25eff91f8f6f44bbb8d3a6a14f610dc4.png
  • Around the thermometer
  • In the circulating water
  • In the heated flask
  • In the condenser
  • In the distillate
Which of the following will form a stable solution - 
SoluteSolvent
I.ethanolwater
II.saltwater
III.oilvinegar
IV.oilgasoline
  • I only
  • I and II only
  • III only
  • I, II, and III only
  • I, II, and IV only
How many mL are in 3.4L?
  • 0.0034 mL
  • 3,400 mL
  • 0.34 mL
  • 3.4 mL
  • 3,400,000 mL
Which is present in greater quantity in solution?
  • Solute
  • Solvent
  • Solubility
  • both A and B 
  • Solvation
Which substances show variations in composition on a particulate and macroscopic level?
  • A pure element.
  • A simple compound.
  • A homogeneous solution.
  • A heterogeneous mixture.
A glass of iced tea is a/an:
  • homogeneous mixture
  • heterogeneous mixture
  • compound
  • element
Which sample is a homogeneous mixture?
  • Kl(aq)
  • Fe(s)
  • $$CO_2$$(g)
  • $$NH_3$$(l)
  • NaCl(s)
Which mixture is correctly paired with a method for separation of the mixture?
  • Oil and water - filter paper
  • Salt water - crystallisation
  • Sand and water - funnel
  • Sand and sugar - tweezers
  • Iron and sand - filter paper
Apparatus used to separate particles in a colloid is: 
  • centrifuge
  • barometer
  • balance
  • calorimeter
  • battery
Solution of magnesium chloride dissolved in water is being distilled in the figure. On completion of distillation, where would magnesium chloride likely be found?

480830_ac99b5416534488fbb30bfbaa2a4519f.png
  • In the distillate
  • In the flask
  • In the circulating water
  • In the condenser
  • Nowhere as mentioned above
What information you can get by solubility of a solute?
  • The quantity of solvent
  • The quantity of solute
  • The temperature of the solution
  • All of the above
What is the meaning of 10% solution of $$\displaystyle NaCl$$?
  • 10 g $$\displaystyle NaCl$$ in 100 grams of solution
  • 58.5 g $$\displaystyle NaCl$$ in 100 grams of solution
  • 94 g $$\displaystyle NaCl$$ in 100 grams of solution
  • 5.85 g of $$\displaystyle { H }_{ 2 }O$$ in 100 grams of solution
Distillate formed after distillation is:
  • a diluted solution
  • may contain impurities
  • a condensed solution
  • a concentrated solution
In fractionating column of fractional distillation, higher___________ in column .
  • temperature becomes lower
  • temperature becomes higher
  • minimum absorption is carried out
  • risks of sublimation exists
Crude oil can be fractionally distillated to produce:
  • diesel
  • petrol
  • paraffin
  • All of the above
Which of the following is correct about distillation?
  • The action of purifying a solid by heating and cooling
  • The action of purifying a liquid by heating it
  • The action of purifying a liquid by heating and cooling
  • None of the above
the separation of different gases from air, are separated from  by which of the following?
  • sedimentation
  • Sublimation
  • Filtration
  • Distillation
During crystallization of copper sulphate, heating is stopped when :
  • solution becomes saturated
  • solution reaches boiling point
  • solution is reduced to half of its quantity
  • None of the above
The process of crystallization begins by:
  • cooling in ice
  • evaporation by heating
  • passing to porous material
  • None of the above
Alcoholic beverages are made through which of the following?
  • Filtration
  • Distillation
  • Evaporation
  • None of the above
Cheese is an example of:
  • aerosol
  • foam
  • solid sol
  • gel
Pure water can be separated from salt water through _____. 
  • simple distillation
  • sublimation
  • filtration
  • None of the above
Which changes of state occur during distillation?
  • Vapourisation followed by filtration
  • Vapourisation followed by condensation
  • Condensation followed by vapourisation
  • Filtration followed by vapourisation
Copper sulphate crystals are of which color after purification?
  • White
  • Black
  • Blue
  • Yellow
After purification by crystallization, copper sulphate crystals can be obtained by :
  • filtration
  • passing through funnel
  • evaporation to dryness
  • All of above
Which of the following can be separated by crystallization?
  • Copper sulphate
  • Salt
  • Potash alum (phitkari)
  • All of the above
While obtaining pure copper sulfate by crystallization, the solution is saturated that is indicated by:
  • change in color
  • change in consistency
  • formation of bubbles
  • formation of crystals near rod
What are the characteristics of the solvent used during purification of copper sulphate by crystallization?
  • Not dissolve the substance at room temperature
  • Dissolve the impurities at room temperature
  • Does not dissolve the impurities at high temperature
  • All of the above
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