CBSE Questions for Class 9 Chemistry Is Matter Around Us Pure Quiz 11 - MCQExams.com


Which of the above diagram shows a suspension mixture?
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  • I and II
  • I, II and III
  • Only III
  • II and IV
Identify the pure substance containing only one type of element.
  • Sugar
  • Diamond
  • Silica
  • Water
Select the correct statements.
  • Lamp black in water is passed in colloid state on addition of gum
  • A white precipitate of $$BaSO_{4}$$ on washing continuously with water gives $$BaSO_{4}$$ solution
  • Electrodialysis is used to remove ionic impurities faster.
  • All are correct
A student was given a mixture of sulphur and iron fillings. He was told to heat the mixture and observe. What will be the colour of the compound formed?
  • Red
  • Black
  • Orange
  • Blue
State true or false.
Sugar solution is a heterogenous mixture.
  • True
  • False
A colloidal system is a two-phase system. Point out which of the following combination can not be considered a colloidal system?
  • solid-solid
  • liquid-liquid
  • gas-gas
  • liquid-gas
A compound can be a mixture of:
  • atoms
  • molecules
  • ions
  • None of these
Aqueous solution of a mixture contains $$LiCl, CuCl, NaCl$$ and $$AlCl_3$$. This is shaken with ether. What is/are left in water?
  • $$LiCl, NaCl$$
  • $$NaCl,$$ $$AlCl_3$$
  • Only $$CuCl$$
  • Only $$NaCl$$
$$A_{2}+B_{2}2AB\xrightarrow [ { H }_{ 2 }O ]{  } $$ Substance $$X$$
$$'X'$$ can be used as glass cleaner. Choose the correct set regarding $$A,B$$ and $$AB$$
  • $$A =$$ Element, $$B =$$ Element, $$AB =$$ Compound
  • $$A =$$ Compound, $$B =$$ Compound, $$AB =$$ Compound
  • $$A =$$ Element, $$B =$$ Compound, $$AB =$$ Compound
  • $$A =$$ Compound, $$B =$$ Element, $$AB =$$ Element
Among the colloids cheese (C), milk (M) and smoke (S), the correct combination of the dispersed phase and dispersing medium, respectively is?
  • C: solid in liquid; M: solid in liquid; S: solid in gas
  • C: solid is liquid; M: liquid in liquid; S: gas in gas
  • C: liquid in solid; M: liquid in solid; S: solid in gas
  • C: liquid in solid; M: liquid in liquid; S: solid in gas
Which of the following compounds do not exist?
  • $${{\text{B}}_{\text{2}}}{\text{C}}{{\text{l}}_{\text{4}}}{\text{,BC}}{{\text{l}}_{\text{2}}}{\text{,C}}{{\text{l}}_{\text{2}}}{\text{B}}$$
  • $${\text{GaC}}{{\text{l}}_{\text{3}}}{\text{,}}\,{\text{GaS}}\,$$
  • $$\text G \text a \text S \text e, \text G \text a_2 \text S_3$$
  • All of these
The example of solid solution is 
  • Glucose in water
  • Copper in gold
  • Camphor in nitrogen
  • Oxygen in nitrogen
If the boiling point difference between the two liquids is less than $$25^oC$$, the _______  method is used to separate them.
  • simple distillation
  • distillation under reduced pressure
  • steam distillation
  • fractional distillation
  • differential extraction
Isotonic solutions are solutions having the same
  • Surface tension
  • Vapour pressure
  • Osmotic pressure
  • Viscosity
Find out a separating technique to separate the following mixture and write a note on it.
  • Two miscible liquids with large difference in boilling points
  • Ammonium chaoride and salt
  • Two immiscible liquids
  • Components from dye
  • Components from milk
Water and alcohol can be separated from a mixture by?
  • Fractional distillation
  • Sublimation
  • Decantation
  • Evaporation
How will you separate a solution (miscible) of benzene and chloroform.
  • Fractional distillation
  • Sublimation
  • Filtration
  • Crystallisation
The boiling points of two miscible liquids, which do not form azeotropic mixture, are close to each other. Their separation is best carried out by:
  • Vacuum distillation
  • Fractional distillation
  • Steam distillation
  • Redistillation
Which of the following is useful for separating pure water from a solution of salt in water?
  • Filtration
  • Simple distillation
  • Steam distillation
  • Chromatography
Two immiscible liquids are separated by?
  • Separating funnel
  • Fractional distillation
  • Chromatography
  • Sublimation
Methanol and acetone can be separated by:
  • Fractional distillation
  • Distillation
  • Steam distillation
  • Vacuum distillation
A mixture of water and NaCl can be separated by:
  • sublimation
  • evaporation
  • decantation
  • filtration
In laboratory, solvent can be separated from solute by the process.
  • Decantation
  • Sedimentation
  • Distillation
  • Filtration
Which one of the following is not represented by sols?
  • Absorption
  • Tyndall effect
  • Flocculation
  • Paramagnetism
Sulphur sol contains
  • Discrete sulphur atoms
  • Discrete sulphur molecules
  • Large aggregates of sulphur molecules
  • Water dispersed in solid sulphur
Which one of the following is a hydrophilic colloidal sol
  • Barium hydroxide solution
  • Arsenic sulphide solution
  • Starch solution
  • Silver chloride solution
Which is a natural colloid?
  • Sodium chloride
  • Urea
  • Cane sugar
  • Blood
The size of particles in suspension, true the solution and colloidal solution varies in order.
  • $$ Suspension> Colloidal> True solution $$
  • $$ Suspension> \left ( Colloidal+ True solution \right ) $$
  • $$ True solution> Suspension> Colloidal $$
  • None of these
The colloidal solution of gelatin is known
  • Solvent loving sol
  • Reversible sol
  • Hydrophilic colloids
  • All of these
Jelly is a form of
  • suspension
  • colloidal solution
  • supersaturated solution
  • true solution
Which one of the sols acts as protective colloid
  • $$ As_{2}S_{3} $$
  • Gelatin
  • Au
  • $$ Fe(OH)_{3} $$
Tyndall effect observed as a result of scattering of light by particles is observed in
  • Suspension
  • Colloidal solution
  • True solution
  • None of these
Which is a colloid?
  • Sugar solution
  • Soda water
  • Milk
  • NaCl solution
Which of the following are compounds? 
$$(i)$$ $$CO $$
$$(ii)$$ $$Na $$
$$(iii)$$ $$NO $$
$$(iv)$$ $$Co$$
  • $$(i)\ and\ (ii)$$
  • $$(ii)\ and\ (iii)$$
  • $$(i)\ and\ (iii)$$
  • $$(ii)\ and\ (iv)$$
Which of the following statement are true for pure substances?
(i) Pure substances contain only one kind of particles.
(ii) Pure substances may be compounds or mixtures.
(iii) Pure substances have the same composition throughout.
(iv) Pure Substances can be exemplified by all elements other than nickel.
  • (i) and (ii)
  • (i) and (iii)
  • (iii) and (iv)
  • (ii) and (iii)
When a mixture of iron powder and sulphur powder is heated strongly to form iron sulphide then heat energy is :
  • Released
  • First absorbed and then released
  • Absorbed
  • Neither absorbed nor released
Which of the following materials fall in the category of a "pure substance"?
  • Ice, milk and iron
  • $$CaO,CO_2$$ and $$NaCl$$
  • Brick, mercury and wood
  • $$\text{Iron}, CaO \text{ and Air}$$
Write true or false for the following statement:

Atoms combine in the ratio of small whole numbers to form compounds.
  • True
  • False
Which of the following procedures will give you water free from all impurities?
  • Adding chlorine tablets
  • Distillation
  • Boiling
  • Filtration
Indicate whether the following statements are true or false. 
A compound is made up of just one kind of atom.
  • True
  • False
Gold that is used to make jewellery is a homogeneous mixture of metals.
  • True
  • False
Heterogeneous mixtures have different compositions and properties throughout the mixture.
  • True
  • False
Which of these is used for the separation of two miscible liquids that have sufficient difference in their boiling points?
  • Evaporation
  • Distillation
  • Alteration
  • Crystallisation
Components of crude petroleum can be separated by :
  • simple distillation
  • hand picking
  • filtration
  • fractional distillation
Which among the following can be given as an example of a homogenous mixture?
  • tap water
  • distilled water
  • sand and water
  • water and oil
A set of mixture is :
  • ink, honey, icecream, milk
  • tapwater, gold, common salt, alloy
  • milk, brass, silver, honey
  • butter, petroleum, tapwater, iron
A heterogeneous mixture has a uniform composition throughout the mixture.
  • True
  • False
Fractional distillation is used to separate liquids having an appreciable difference in their
  • size and shape
  • solubility
  • boiling points
  • None of these
Which of the following property is not shown by compounds?
  • They are heterogeneous.
  • They are homogeneous.
  • They have definite molecular formulae.
  • They have fixed melting and boiling points.
Elements combine in definite proportions to form compounds
  • True
  • False
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