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CBSE Questions for Class 9 Chemistry Is Matter Around Us Pure Quiz 11 - MCQExams.com
CBSE
Class 9 Chemistry
Is Matter Around Us Pure
Quiz 11
Which of the above diagram shows a suspension mixture?
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I and II
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I, II and III
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Only III
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II and IV
Identify the pure substance containing only one type of element.
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Sugar
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Diamond
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Silica
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Water
Explanation
Here sugar $$(C_{12}H_{22}O_{11})$$ , silica $$(SiO_2)$$ and water $$(H_2O)$$ are compounds that contain more than one element.
Therefore, they are not pure substances.
While the diamond is an isotope of carbon only. Therefore diamond is a pure substance.
So, the correct answer is $$B$$.
Select the correct statements.
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Lamp black in water is passed in colloid state on addition of gum
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A white precipitate of $$BaSO_{4}$$ on washing continuously with water gives $$BaSO_{4}$$ solution
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Electrodialysis is used to remove ionic impurities faster.
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All are correct
Explanation
A) All gums are soluble in water. When Lampblack in water is passed, gums in the water get hydrolyzed to yield a number of monosaccharides that are smaller in size. Thus, a colloidal sol is obtained. This is a correct statement.
B) Formation of a white precipitate
of $$BaSO_{4}$$
that is insoluble in water but continuously washing with a large amount of water gives
$$BaSO_{4}$$ solution.
This is a correct statement.
C) Electrodialysis has been studied worldwide for the separative removal of various contaminants, such as nitrate, bromide, sodium, zinc, etc.
This is also a correct statement.
Therefore all are correct statements.
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?
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Red
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Black
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Orange
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Blue
Explanation
When sulphur and iron filings are mixed and heated they form a compound $$FeS$$ (ferrous sulphide). $$FeS$$ is black in colour.
$$Fe+S\longrightarrow FeS$$ (
Black coloured compound)
So, the correct option is (B)
State true or false.
Sugar solution is a heterogenous mixture.
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True
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False
Explanation
A sugar solution is a homogeneous mixture because any substance dissolve in water is homogeneous mixture.
A colloidal system is a two-phase system. Point out which of the following combination can not be considered a colloidal system?
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solid-solid
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liquid-liquid
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gas-gas
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liquid-gas
Explanation
A solid-solid combination can be considered as a colloidal solution and the nature of the solution is solid sol. For example, colorful stone.
A liquid-liquid solution can be considered as a colloidal solution and the nature of the solution is an emulsion. Example, milk
A liquid-gas combination can be considered as a colloidal solution and the nature of the solution is aerosol. For example, cloud.
A gas-gas combination $$\text {can not be}$$ considered as a colloidal solution because this is homogeneous mixture and a colloidal solution is always a heterogeneous mixture.
Hence, option $$C$$ is correct.
A compound can be a mixture of:
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atoms
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molecules
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ions
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None of these
Explanation
A compound consists of atoms of two or more different elements bound together.
So, option $$A$$ is correct.
Aqueous solution of a mixture contains $$LiCl, CuCl, NaCl$$ and $$AlCl_3$$. This is shaken with ether. What is/are left in water?
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$$LiCl, NaCl$$
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$$NaCl,$$ $$AlCl_3$$
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Only $$CuCl$$
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Only $$NaCl$$
Explanation
1) $$LiCl$$ ,$$NaCl$$ are alkali halides.
2) Mostly aqueous solution of alkali halides are extracted when ethers are added.
so, in this case $$AlCl_3$$ and $$CuCl$$ will be eliminated.Thus, answer turns out to be $$LiCl$$ and $$NaCl$$.
Hence, option $$A$$ is correct.
$$A_{2}+B_{2}2AB\xrightarrow [ { H }_{ 2 }O ]{ } $$ Substance $$X$$
$$'X'$$ can be used as glass cleaner. Choose the correct set regarding $$A,B$$ and $$AB$$
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$$A =$$ Element, $$B =$$ Element, $$AB =$$ Compound
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$$A =$$ Compound, $$B =$$ Compound, $$AB =$$ Compound
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$$A =$$ Element, $$B =$$ Compound, $$AB =$$ Compound
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$$A =$$ 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?
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C: solid in liquid; M: solid in liquid; S: solid in gas
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C: solid is liquid; M: liquid in liquid; S: gas in gas
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C: liquid in solid; M: liquid in solid; S: solid in gas
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C: liquid in solid; M: liquid in liquid; S: solid in gas
Explanation
$$Cheese$$
$$Milk$$
$$Smoke$$
$$Dispersed\ phase$$
Liquid
Liquid
Solid
$$Dispersing\ medium$$
Solid
Liquid
Gas
Which of the following compounds do not exist?
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$${{\text{B}}_{\text{2}}}{\text{C}}{{\text{l}}_{\text{4}}}{\text{,BC}}{{\text{l}}_{\text{2}}}{\text{,C}}{{\text{l}}_{\text{2}}}{\text{B}}$$
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$${\text{GaC}}{{\text{l}}_{\text{3}}}{\text{,}}\,{\text{GaS}}\,$$
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$$\text G \text a \text S \text e, \text G \text a_2 \text S_3$$
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All of these
Explanation
In $$B_2Cl_4, BCl_2$$ & $$Cl_2B$$, chlorine due to its large size can not fit in between boron atoms. So, these compounds do not exist.
Hence, option $$A$$ is correct.
The example of solid solution is
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Glucose in water
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Copper in gold
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Camphor in nitrogen
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Oxygen in nitrogen
If the boiling point difference between the two liquids is less than $$25^oC$$, the _______ method is used to separate them.
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simple distillation
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distillation under reduced pressure
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steam distillation
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fractional distillation
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differential extraction
Explanation
Fractional distillation is a special type of distillation designed to separate a mixture of two or more liquids that have different boiling points. The process involves heating the mixture and partial condensation of the vapors along a column (fractionating column), which is set up such that components with lower boiling points pass through the column and are collected earlier than components with higher boiling points.
Generally, this method is used when the components present boil at less than $$25^oC$$ from each other under the pressure of one atmosphere.
Isotonic solutions are solutions having the same
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Surface tension
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Vapour pressure
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Osmotic pressure
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Viscosity
Explanation
An isotonic solution refers to two solutions having the same osmotic pressure across a semipermeable membrane. This state allows for the free movement of water across the membrane without changing the concentration of solutes on either side.
Find out a separating technique to separate the following mixture and write a note on it.
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Two miscible liquids with large difference in boilling points
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Ammonium chaoride and salt
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Two immiscible liquids
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Components from dye
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Components from milk
Water and alcohol can be separated from a mixture by?
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Fractional distillation
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Sublimation
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Decantation
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Evaporation
Explanation
To separate a mixture of alcohol (ethanol) and water, you can use a process known as fractional distillation. This technique relies on the fact that the compounds in the mixture have different boiling points. Since ethanol boils at a lower temperature $$(78.5^oC)$$ than water, the alcohol vaporizes while most of the water remains a liquid.
How will you separate a solution (miscible) of benzene and chloroform.
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Fractional distillation
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Sublimation
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Filtration
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Crystallisation
Explanation
fractional distillation because the boiling point of benzene
$$(80^oC)$$ and chloroform
$$(61.5^oC)$$ are close. Fractional distillation involves repeated distillations and condensations, in a fractionating column. The basic principle of this distillation is that different liquid boils and evaporates at different temperatures. So, it can separate miscible liquids.
Option $$A$$ is correct.
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:
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Vacuum distillation
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Fractional distillation
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Steam distillation
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Redistillation
Explanation
Fractional distillation is the separation of a mixture into its component parts, or fractions. Chemical compounds are separated by heating them to a temperature at which one or more fractions of the mixture will vaporize. It uses distillation to fractionate. Fractional distillation cannot be carried out for azeotropic mixture as they have constant boiling point.
$$\mathbf{Hence\ the\ correct\ answer\ is\ the\ option \ (B)}$$
Which of the following is useful for separating pure water from a solution of salt in water?
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Filtration
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Simple distillation
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Steam distillation
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Chromatography
Explanation
Simple d
istillation can be used to obtain pure water from a solution of salt in water.
During distillation, water is evaporated by heating. The evaporated water vapours are condensed and collected in the receiving flask. Salt remains in the distillation flask.
Two immiscible liquids are separated by?
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Separating funnel
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Fractional distillation
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Chromatography
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Sublimation
Explanation
Separating immiscible liquids is done simply using a
separating funnel
. The two liquids are put into the funnel and are left for a short time to settle out and form two layers. The tap of the funnel is opened and the bottom liquid is allowed to run. The two liquids are now separate.
Methanol and acetone can be separated by:
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Fractional distillation
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Distillation
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Steam distillation
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Vacuum distillation
Explanation
Fractional distillation is employed for a separating mixture of two or more volatile liquids having a boiling point difference approx less than $$25-30^\circ C$$. Acetone has a boiling point $$60^\circ C$$, whereas methanol has a boiling point of $$65^\circ C$$. Hence, it can be separated by fractional distillation.
Option A is correct.
A mixture of water and NaCl can be separated by:
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sublimation
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evaporation
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decantation
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filtration
Explanation
There is a difference in the boiling point of water and $$NaCl$$(salt). The boiling point of water is less than salt. On heating the mixture of water and $$NaCl$$, water evaporates leaving behind salt$$(NaCl)$$, so evaporation can be used to remove the water to obtain salt.
In laboratory, solvent can be separated from solute by the process.
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Decantation
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Sedimentation
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Distillation
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Filtration
Explanation
Both a solute
and a solvent
are components of a solution which is a homogenous mixture. Many solutions
in chemistry are aqueous solutions.
Since the solution is a physical mixture, separation involves using a physical process such as evaporation or distillation. The water can be evaporated leaving the dry solute behind and then the water can be condensed.
Option C is correct.
Which one of the following is not represented by sols?
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Absorption
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Tyndall effect
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Flocculation
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Paramagnetism
Explanation
Absorption, Tyndall effect and flocculation all are related to sol but paramagnetism is not represented by sol.
Sulphur sol contains
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Discrete sulphur atoms
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Discrete sulphur molecules
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Large aggregates of sulphur molecules
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Water dispersed in solid sulphur
Explanation
Sulphur sol contains an aggregate of thousands of $$ S_8 $$
sulphur molecules.
If large number of atoms or smaller molecules of a substance aggregate together to form particles having size in the colloidal range then the colloidal system is known as multimolecular colloid.
Which one of the following is a hydrophilic colloidal sol
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Barium hydroxide solution
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Arsenic sulphide solution
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Starch solution
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Silver chloride solution
Explanation
Starch is an example of a hydrophilic colloidal sol. It has strong affinity between disperse phase and dispersion medium. It is a reversible and stable sol.
Which is a natural colloid?
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Sodium chloride
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Urea
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Cane sugar
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Blood
Explanation
$$\text{Blood}$$ is a natural colloid.
Sodium chloride, cane sugar, and urea can get dissolved completely in water and forms a homogeneous solution.
Option $$D$$ is correct.
The size of particles in suspension, true the solution and colloidal solution varies in order.
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$$ Suspension> Colloidal> True solution $$
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$$ Suspension> \left ( Colloidal+ True solution \right ) $$
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$$ True solution> Suspension> Colloidal $$
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None of these
Explanation
$$ Suspension> Colloidal> True solution $$
The colloidal solution of gelatin is known
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Solvent loving sol
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Reversible sol
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Hydrophilic colloids
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All of these
Explanation
Gelatin, can behave both as a sol and a gel. At high temperature and
low concentration of gelatin, the colloid is a hydrosol, but at low temperature and high gelatin concentration,
the hydrosol can change into a gel which is solvent loving and hydrophilic.
Jelly is a form of
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suspension
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colloidal solution
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supersaturated solution
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true solution
Explanation
Jelly is a colloidal solution of sweetened fruit, water and a thickener called
pectin. In it, the dispersed phase is liquid (water or sugar syrup) and the dispersing medium is solid (bits of sweetened fruit pulp). It belongs to the category of 'gel' type of colloid.
Which one of the sols acts as protective colloid
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$$ As_{2}S_{3} $$
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Gelatin
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Au
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$$ Fe(OH)_{3} $$
Explanation
Gelatin with lowest gold number, act as best protective colloid.
Tyndall effect
observed as a result of scattering of light by particles is observed in
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Suspension
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Colloidal solution
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True solution
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None of these
Explanation
The Tyndall effect is due to the fact that colloidal particles scatter light in all directions in space. This scattering of light illuminates the path of the beam in the colloidal dispersion.
Which is a colloid?
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Sugar solution
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Soda water
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Milk
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NaCl solution
Explanation
A solution in which the size of the particle is intermediate between true solution and suspension is called colloid.
Examples of colloids are soap solution, blood, milk, etc.
A colloid is a heterogeneous mixture whereas sugar solution, soda water, and $$NaCl$$ solution are homogeneous mixtures.
Which of the following are compounds?
$$(i)$$ $$CO $$
$$(ii)$$ $$Na $$
$$(iii)$$ $$NO $$
$$(iv)$$ $$Co$$
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$$(i)\ and\ (ii)$$
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$$(ii)\ and\ (iii)$$
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$$(i)\ and\ (iii)$$
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$$(ii)\ and\ (iv)$$
Explanation
A compound is an electrically neutral group of two or more atoms of different elements held together by chemical bonds.
$$NO$$ and $$CO$$ are compounds since they are made up of atoms of two different elements.
Whereas, $$Na$$ and $$Co$$ are made up of one type of atom and are elements.
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.
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(i) and (ii)
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(i) and (iii)
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(iii) and (iv)
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(ii) and (iii)
Explanation
Pure substances contain only one kind of particle and have the same composition throughout. Hence statements (i) and (iii) are true.
Pure substances may be elements or compounds.
Mixtures are not pure substances, hence option (ii) is False.
Pure substances can be exemplified by all elements, including nickel. Hence option (iv) is false.
Therefore, option B is the correct answer for this question.
When a mixture of iron powder and sulphur powder is heated strongly to form iron sulphide then heat energy is :
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Released
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First absorbed and then released
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Absorbed
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Neither absorbed nor released
Explanation
When a mixture of iron and sulphur is heated strongly, they first absorb the energy to get excited. This is followed by the formation of a new compound iron sulphide
(
F
e
S
)
(FeS)
with the release of the huge amount of energy in the form of heat and light.
Which of the following materials fall in the category of a "pure substance"?
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Ice, milk and iron
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$$CaO,CO_2$$ and $$NaCl$$
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Brick, mercury and wood
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$$\text{Iron}, CaO \text{ and Air}$$
Explanation
Pure substances are those in which all the constituent particles present in them are the same and identical in chemical nature.
Elements and compounds are examples of pure substances.
$$CaO, CO2, NaCl$$ are examples of compounds.
Air, milk. brick and wood fall under impure substances.
Write true or false for the following statement:
Atoms combine in the ratio of small whole numbers to form compounds.
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True
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False
Explanation
According to Dalton's theory, atoms combine in the ratio of small whole numbers to form compounds.
For example, hydrogen and oxygen atoms combine in a ratio of $$2:1$$ to form the compound water $$(H_2O)$$.
Hence, the above statement is true.
Which of the following procedures will give you water free from all impurities?
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Adding chlorine tablets
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Distillation
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Boiling
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Filtration
Explanation
To get rid of all the
impurities from water, it is distilled and the process is known as
distillation.
Hence, Option "B" is correct answer.
Indicate whether the following statements are true or false.
A compound is made up of just one kind of atom.
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True
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False
Explanation
A compound is made up of two or more elements of same kind or different kind in fixed proportion by mass.
Gold that is used to make jewellery is a homogeneous mixture of metals.
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True
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False
Explanation
A mixture of silver, copper, pure gold (and a trace of zinc) gives yellow gold jewellery its rich shine. The ratio of gold and these other metals remain constant throughout the ornament or jewellery and cannot be distinguished easily. Hence, gold used to make jewellery is a homogeneous mixture of metals known as an alloy.
Heterogeneous mixtures have different compositions and properties throughout the mixture.
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True
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False
Explanation
Heterogeneous mixture is a type of mixture in which the composition is not uniform throughout the mixture.It consists of two or more phases. Examples are sand and water mixture, oil and water mixture.
Hence above statement is true.
Which of these is used for the separation of two miscible liquids that have sufficient difference in their boiling points?
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Evaporation
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Distillation
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Alteration
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Crystallisation
Explanation
Distillation is used to separate miscible liquids based on the high difference in their boiling points.
Evaporation is used to separate a non-volatile solute from a volatile solvent.
Alteration is not a method of separation.
Crystallisation is used to separate a pure solid in the form
of its crystals from a solution.
Components of crude petroleum can be separated by :
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simple distillation
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hand picking
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filtration
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fractional distillation
Explanation
$$Fractional \;distillation$$ is the separation of a mixture into its parts or fractions. Chemical compounds are separated by heating them to a temperature at which one or more fractions of the mixture will vaporize. It uses distillation to fractionate.
Crude petroleum is a mixture of many different components that have varied boiling points.
hence option $$(D)$$ is correct.
Which among the following can be given as an example of a homogenous mixture?
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tap water
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distilled water
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sand and water
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water and oil
Explanation
Distilled water is a compound, not a mixture, since it is exactly pure $$H_2O$$
Sand and water and water in oil, are examples of heterogeneous mixtures.
Tap water contains some minerals as well as metallic impurities distributed uniformly throughout the sample.
Hence option $$(A)$$ is correct.
A set of mixture is :
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ink, honey, icecream, milk
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tapwater, gold, common salt, alloy
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milk, brass, silver, honey
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butter, petroleum, tapwater, iron
Explanation
In chemistry, a mixture is a material made up of two or more different substances which are physically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids
Hence $$ink,\;honey,\;ice\; cream\; and\; milk$$ form a set of mixture.
Option ($$A$$) is correct.
A heterogeneous mixture has a uniform composition throughout the mixture.
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True
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False
Explanation
A heterogeneous mixture has a $$non-uniform$$ composition through-out the mixture.
Answer is $$False$$.
Fractional distillation is used to separate liquids having an appreciable difference in their
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size and shape
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solubility
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boiling points
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None of these
Explanation
Fractional distillation is the separation of a mixture into its component parts or fractions. Chemical compounds are separated by heating them to a temperature at which one or more fractions of the mixture will vaporize. It uses distillation to fractionate. It is used to separate liquids having an appreciable difference in their $$\text{boiling points}$$.
Which of the following property is not shown by compounds?
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They are heterogeneous.
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They are homogeneous.
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They have definite molecular formulae.
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They have fixed melting and boiling points.
Explanation
Mixtures are heterogeneous in nature but compounds are homogeneous in nature.
Option A is correct.
Elements combine in definite proportions to form compounds
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True
0%
False
Explanation
A chemical compound is a substance composed of two or more different elements chemically bonded together in a fixed proportion by mass. However, not all molecules are compounds. Compounds are pure substances that contain two or more elements combined in a definite fixed proportion
or Two or more elements combine together in a fixed proportion to form a compound. Hence the given statement is true,
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