CBSE Questions for Class 9 Chemistry Is Matter Around Us Pure Quiz 4 - MCQExams.com

State True or False.
A compound is always heterogeneous while a mixture may be heterogeneous or homogeneous.
  • True
  • False
Salt dissolved in water can be recovered by:
  • Decantation
  • Filtration
  • Sedimentation
  • Evaporation
Block "B" in the concept map is:
270327_e6985c2f98384348810f3d4423166f60.JPG
  • Homogenous mixture
  • Compounds
  • Elements
  • Molecules
Tyndall effect associated with colloidal particles is due to:
  • presence of electrical charges
  • scattering of light
  • adsorption of light
  • reflection of light
Soil is a homogeneous mixture.
Write true or flase.
  • True
  • False
State True or False.
Suspensions have solute particles with size less than 1 nm.
  • True
  • False
Which of the following mixtures will be the most difficult to separate?
  • Iron filings + sand
  • Sand + water
  • Saw dust + stones
  • Nitrogen + hydrogen

If the mixture contains water, sand, glass and sugar. What could be $$Z$$ in the given purification?
273314_c4f607ad50c4499482e51d283c5c4d66.png
  • Sugar
  • Sand
  • Glass
  • None of these
Steel is a type of:
  • pure substance
  • compound
  • mixture
  • element

To separate the constituents of a mixture, a student did the above actions as shown in the flowchart. What could have been the mixture?

273306_3d657a1d1dee4741983f6435e3358727.png
  • Water + sand + glass
  • Oxygen + hydrogen + salt
  • Stones + rice + water
  • Sand + sugar + water
Fill in the blanks.

When sugar is dissolved in water, sugar is the ______, water is the ______ and sweet water is the ______ respectively.
  • solvent, solute, solution
  • solute, solvent, solution
  • solute, solution, solvent
  • solution, solvent, solute
Crude petroleum has many components that are useful. Which of the following methods is employed to separate the components?
  • Electrolysis
  • Decantation
  • Filtration
  • Fractional distillation
Sugar dissolves in water to form sugar-water solution. Name the solute.
  • Sugar
  • Water
  • Sugar-water
  • Sugar & water
Salt dissolves in water to form salt water. Name the solvent.
  • Salt
  • Water
  • Salt-water
  • Sea water
Filtration as a method of separation can be used for:
  • homogeneous gas in liquid mixtures
  • heterogeneous liquid in liquid mixtures
  • homogeneous solid in liquid mixtures
  • heterogeneous solid in liquid mixtures
Kerosene does not dissolve in water. They are called:
  • Immiscible liquids
  • Saturated liquids
  • Miscible liquids
  • None of the above
A few colored glass pieces that are big in size are mixed with sugar. The easiest way to separate them is:
  • heat the mixture
  • add the mixture to water
  • handpick the glass pieces
  • handpick the sugar particles
Brass is an example of a:
  • homogeneous compound.
  • homogeneous mixture.
  • heterogeneous mixture.
  • heterogeneous compound.
To separate ammonium chloride from common salt, we use:
  • filtration
  • sedimentation
  • sieving
  • sublimation
How is scrap-iron separated from other wastes in a scrap yard?
  • Sublimation
  • Magnetic separation
  • Handpicking
  • Winnowing
Separating funnel is used to separate immiscible liquids based on their:
  • different densities
  • boiling points
  • sublimating nature
  • magnetic properties
A mixture is a /an :
  • pure substance
  • impure substance
  • refined substance
  • none of the above
A small boy mischievously mixed small pebbles into a bag of pulses. What method will you employ to separate the mixture?
  • Magnetic separation
  • Crystallisation
  • Handpicking
  • Filtration
A homogeneous mixture is:
  • made up of only one kind of molecules
  • one in which components cannot be distinguished
  • one in which components can be distinguished
  • one in which the components are not distributed uniformly
Evaporation followed by condensation occurs in:
  • filtration
  • sublimation
  • evaporation
  • distillation
Choose the substance that is used as a filter.
  • Oil paper
  • Silicon dioxide
  • Unglazed porcelain
  • Plastic
Crude oil is purified using fractional distillation process. This method works on the principle of:
  • differences in the masses of the components
  • differences in the volumes of the components
  • differences in the boiling points of the components
  • their solubility in water
A vendor sells white powdered salt mixed with white powdered stone. The knowledge of which property will help you detect this malpractice?
  • Ductility
  • Opacity
  • Malleability
  • Solubility
Which of the following involves fractional distillation?
i. Separation of constituents from liquefied air
ii. Separation of constituents from crude petroleum
iii. Separation of carbon tetrachloride from water
iv. Separation of naphthalene from common salt.
  • i and ii
  • i and iv
  • ii and iv
  • i and iii
A pure substance can be a/an :
  • compound
  • element
  • element or a compound
  • none of the above
Which of the following statement is not true about colloidal solution ?
  • These are visible under powerful microscope
  • Their particles do not settle down with passage of time
  • Their particles are electrically charged
  • These are homogeneous in nature
Compounds have:
  • only one kind of atoms.
  • only one kind of elements.
  • only one kind of molecules.
  • atoms from different elements combined in fixed ratio.
Which of the following statements is not true about suspension ?
  • The particles of suspension can be separated from solvent by the process of filtration
  • When the suspension is kept undisturbed then the particles of suspension settle down
  • A suspension is homogeneous in nature
  • Scattering of particles take place in suspension
The crystals that are obtained after crystallization are:
  • more than 90% pure
  • between 40% and 80% pure
  • between 10% to 40% pure
  • 10% pure
The principle behind fractional distillation technique in separation of two liquids is :
  • difference in melting point
  • difference in boiling point
  • difference in concentration
  • difference in solubility
In which of the following, dispersed phase is a liquid while dispersion medium is a gas?
  • Cloud
  • Smoke
  • Gel
  • Soap bubble
Carbon burns in oxygen to form carbon dioxide. The properties of carbon dioxide are:
  • Similar to carbon
  • Similar to oxygen
  • Totally different from both carbon and oxygen
  • Much similar to both carbon and oxygen
Which of the following process is used to obtain common salt from seawater?
  • Distillation
  • Evaporation
  • Filtration
  • Sublimation
Which is the most effective method of separating mixtures of miscible volatile liquids?
  • Fractional distilliation
  • Hand picking
  • Chromatography
  • Filtration
Which one of the following is not a property of solution?
  • Solution is a homogeneous mixture
  • Solution does not scatter light
  • Path of light is visible in solution
  • Solute particles do not settle down when left undisturbed
Raghav, Ajay and Nita were given three test tubes K, L and M respectively containing unknown substances They observed the following properties about their solutions
SubstanceProperty
KThe components can be separated by filtration
LParticles scatter the light
MParticles size is $$\displaystyle 10^{-9}$$ to $$\displaystyle 10^{-7}$$ m
On the basis of the above properties identify the solutions K, L and M respectively
  • Ferrous sulphate solution, tonic, paints
  • Calcium carbonate solution, paints, milk
  • Muddy water, milk, calcium carbonate solution
  • Paints, ferrous sulphate solution, calcium carbonate solution
Which of the following best describes the methods to separate a mixture of two miscible liquids and two immiscible liquids​ respectively?
  • Separating funnel and fractional distillation
  • Fractional distillation and separating funnel
  • Fractional distillation and chromatography
  • None of these
A mixture of sodium chloride and calcium carbonate is separated using the steps given. In which order should the steps be carried out?
316202.png
  • 1, 2 then 3
  • 2, 1 then 3
  • 1, 3 then 2
  • 3, 1 then 2
Nandita have a liquid $$Y$$ which boils at 388 K.  Which of the following separation method will Nandita adopt to separate $$Y$$ from a mixture containing another substance $$Z$$ which boils at 368 K?
(Both $$Y$$ and $$Z$$ are miscible)
Which of the following is not a suspension?
  • Flour in water
  • Chalk in water
  • Muddy water
  • Milk
A mixture of sand and iodine can be separated by:
  • distillation
  • fractionation
  • sublimation
  • filtration
Compounds may be formed by:
  • decomposition of other compounds
  • combination of elements
  • combination of compounds
  • all of the above methods
Match the column-I with column-II and select the correct option from the codes given below:

Column-IColumn-II
(a) Ammonium chloride and salt(i)
(b) Oil and water(ii)
(c) Drugs in blood(iii)
(d) Ethyl alcohol and water(iv)

315353_3b6dd73c6df54a23aa636ec0351f401c.png
  • (a - i), (b - iii), (c - ii), (d - iv)
  • (a - ii), (b - iv), (c - i), (d - iii)
  • (a - ii), (b - iii), (c - iv), (d - i)
  • (a - iii), (b - ii), (c - i), (d - iv)
A mixture of iodine and methyl alcohol can be separated by:
  • solvent extraction
  • distillation
  • sublimation
  • crystallisation
$$X$$ and $$Y$$ are miscible liquids. The boiling point of $$X$$ is $$56^\circ\, C$$ and that of $$Y$$ is $$100^\circ\, C$$. Which separation technique can be used to separate $$X$$ and $$Y$$ from the mixture?
  • Separating funnel
  • Distillation
  • Centrifugation
  • Handpicking
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