CBSE Questions for Class 9 Chemistry Is Matter Around Us Pure Quiz 13 - MCQExams.com

How many of the following are elements:
Diamond, Graphite, Silica, Alumina, Sodium, and Water
  • 5
  • 3
  • 7
  • 8
Homogeneous mixture is formed by mixing 
  • sand and water
  • iron filing and sand
  • silver chloride and water
  • ethanol and water
$$K_{sp}$$ of $$ { Mg }(OH)_{ 2 }$$ is $$4.0\times { 10 }^{ -12 }$$, the number of moles of $$ { Mg }^{ 2+ }$$ ions in one litre of its salurated solution in $$0.1 M\ NaOH $$ is:
  • $$4.0\times { 10 }^{ -10 }$$
  • $$1.0\times { 10 }^{ -4 }$$
  • $$2.0\times { 10 }^{ -6 }$$
  • $$8.10\times { 10 }^{ -6 }$$
Gelatin protects : 
  • Gold sol
  • $${ As }_{ 2 }{ S }_{ 3 }$$ sol
  • $$Fe\left( OH \right) _{ 3 }sol$$
  • All of these
The amount of electrolytes required coagulate a given amount of AgI colloidal solution (-ve charge) will be in the order
  • $$Na{ NO }_{ 3 }>A{ l}_{ 2 }(N{ O })_{ 3 }>Ba(N{ O }_{ 3 }{ ) }_{ 2 }$$
  • $$A{ 1 }_{ 2 }(N{ O })_{ 3 }>Ba(N{ O }_{ 3 }{ ) }_{ 2 }>NaN{ O }_{ 3 }$$
  • $$A{ 1 }_{ 2 }(N{ O })_{ 3 }>NaN{ O }_{ 3 }>Ba(N{ O }_{ 3 }{ ) }_{ 2 }$$
  • $$NaN{ O }_{ 3 }>Ba(N{ O }_{ 3 }{ ) }_{ 2 }>A{ 1 }_{ 2 }(N{ O }_{ 3 }{ ) }_{ 3 }$$
Name the process used for the separation of colours in dye.
  • Distillation
  • Centrifugation
  • Chromatography
  • Decantation
  • All of the above can be used.
  • None of the above can be used.
What is this activity?
1574177_b09d174e13c44d3888ee8c85a4a8f3e2.png
  • Sublimation
  • Crystallisation
  • Evaporation
  • None of the above
Arrange true solution, colloidal solution, and suspension in the decreasing order of their particle size.
  • Suspension > True solution > Colloid
  • Colloid > Suspension > True solution
  • Suspension > Colloid > True solution
  • True solution > Colloidal > Suspension
A mixture of methanol (B.P 64.7$$^oC$$ ) and acetone (B.P 56$$^oC$$ ) can be separated by:
  • Simple distillation
  • Fractional distillation
  • Centrifugation
  • None of these
Gold sol is not
  • a macromolecular colloid
  • a lyophobic colloid
  • a multimolecular colloid
  • negatively charge colloid
The experimental setup shows that the small beaker is filled with ice. At first, the large beaker is empty. Where did the water in the large beaker probably come from?
1522816_54c32e7e29444f03854e2d9b0b2bc3b0.jpg
  • Water condensing on the small beaker's surface dripping down.
  • Melted ice dripping down through a crack in the small beaker.
  • A chemical reaction between the ice and the glass of the beaker.
  • Water condensing on the inside of the large beaker.
Which characterstic is true in respect of colloidal particle?
  • They always have two phase
  • They are only in liquid state
  • They can't be electrolysed
  • They are only hydrophilic
Which one of the following is not a colloidal solution?
  • Smoke
  • Ink
  • Air
  • Blood
The solvent which neither accepts nor donates proton is called________
  • Amphoteric
  • Neutral
  • Aprotic
  • Amphiprotic
Size of colloidal particles is
  • 0.1 $$ \mu m$$ to 0.001 $$ \mu m $$
  • 10 $$\mu m $$ to 20 $$\mu m $$
  • 0.05 $$ \mu m $$ to 0.1 $$ \mu m $$
  • 25 $$\mu m$$ to 30 $$\mu m $$
The volume of a colloidal particle, $$ V_{C} $$  as compared to the volume of a solute particle in a true solution $$ V_{S} $$ could be:
  • $$ \dfrac{V_{C}}{V_{S}}\simeq 1 $$
  • $$ \dfrac{V_{C}}{V_{S}}\simeq 10^{23} $$
  • $$ \dfrac{V_{C}}{V_{S}}\simeq 10^{-3} $$
  • $$ \dfrac{V_{C}}{V_{S}}\simeq 10^{3} $$
Which of the following is property of colloid?
  • scattering of light
  • They show attraction
  • sublimation
  • opaque
Size of colloidal particle is:
  •  $$\mathrm {1 \ to\  10}\  \overset{o}{A} $$
  •  $$\mathrm { 0.20\  to\ 0.50} \ \overset{o}{A} $$
  •  $$\mathrm {10\  to\  1000}\  \overset{o}{A} $$
  • $$ \mathrm {0.01\ to\ 0.1 }\ \overset{o}{A} $$
Suspensions are
  • visible to naked eye
  • invisible through microscope
  • not visible by any means
  • invisible under electron microscope
It is possible to obtain oxygen from air by fractional distillation because 
  • Oxygen is in a different group of the periodic table from Nitrogen
  • Oxygen is more reactive than Nitrogen
  • Oxygen has higher b.p than Nitrogen
  • Oxygen has lower density than Nitrogen
Which is not colloid?
  • Chlorophyll
  • Egg
  • Ruby glass
  • Milk
Example of a homogeneous mixture is:
  • distilled water
  • tap water
  • sand and water
  • sawdust and water
An examples of homogenous mixture is: 
  • Mixture of milk and sugar
  • Mixture of sand and iron
  • Mixture of soil and water
  • Mixture of oil and water
Which of the following is a heterogenous mixture ?
  • sugar solution
  • aqueous solution of salt
  • sand dissolved in water
  • soda water
A liquid which contains the dissolved material is known as
  • Solvent
  • Solution
  • Solute
  • None of these
A liquid leaves no residue when passes through the ultrafilter paper. The liquid is:
  • a suspension
  • oil
  • a colloidal sol
  • a true solution
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