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Science M.C.Q. [1 M]

Is Matter Around Us Pure · CBSE STD 9 (CBSE - English Medium). 154 questions.

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M.C.Q. [1 M]

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MCQ 11 Mark
Hydrated $\mathrm{CuSO}_4$ from its aqueous solution:
  • A
    Distillation
  • B
    Fractional
  • ✓
    Evaporation
  • D
    Decantation
Answer
Correct option: C.
Evaporation
Evaporation is used to separate this mixture.
Firstly we have to heat the $\mathrm{CuSO}_4$ solution to a saturated solution $($about$\frac{3}{4}$of the water has vapourised$)$.
Then leave the solution in a beaker to cool it. When the solution is let to cool down, crystallization will occur.
When you cool it, be sure to cover the solution so that no impurities will go inside. After that, filter the crystal out. Then put it on a dry filter paper and let it dry.
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MCQ 21 Mark
Which of the following are homogeneous in nature?
$i.$ Ice
$ii.$ Wood
$iii.$ Soil
$iv.$ Air
  • A
    $(i)$ and $(iii)$
  • B
    $(ii)$ and $(iii)$
  • ✓
    $(i)$ and $(iv)$
  • D
    $(iii)$ and $(iv)$
Answer
Correct option: C.
$(i)$ and $(iv)$
Ice and air are homogeneous in nature as their compositions remain same throughout.
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MCQ 31 Mark
The number of phases present in a true solution is:
  • ✓
    $1$
  • B
    $2$
  • C
    Depends on the number of solutes
  • D
    Innumerable
Answer
Correct option: A.
$1$

A true solution is when a substance is dissolved into another substance.
This means that the particles can't be separated even with filter paper and the solid is no longer visible to the naked eye.

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MCQ 41 Mark
The property/ properties which enable copper metal to be used for making electric wires is / are:
  • A
    Copper metal is malleable and ductile.
  • B
    Copper metal is a good conductor of electricity.
  • ✓
    Copper metal is ductile and has low electrical resistance.
  • D
    Copper metal is sonorous and an excellent conductor of electricity.
Answer
Correct option: C.
Copper metal is ductile and has low electrical resistance.
Copper is a good conductor of electricity. It means that it offers very low electric resistance. Also, it is highly ductile due to which it can be drawn into very thin wires.
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MCQ 51 Mark
The principle behind fractional distillation technique in separation of two liquids is :
  • A
    difference in melting point
  • ✓
    difference in boiling point
  • C
    difference in concentration
  • D
    difference in solubility
Answer
Correct option: B.
difference in boiling point
Explanation: (B) difference in boiling point
Fractional distillation is the separation of a mixture into its component parts or fractions such as in separating chemical compounds by their boiling point by heating them to a temperature at which one or more fractions of compound will vaporize.
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MCQ 61 Mark
Which one of the following is not a property of solution:
  • A
    Solution is a homogeneous mixture
  • B
    Solution does not scatter light
  • ✓
    Path of light is visible in solution
  • D
    Solute particles do not settle down when left undisturbed
Answer
Correct option: C.
Path of light is visible in solution
A solution is a special type of homogeneous mixture.
Solutions are homogeneous because the ratio of solute to solvent remains the same throughout the solution even if homogenized with multiple sources, and stable because.
The solute will not settle out after any period of time, and it cannot be removed by a filter or a centrifuge.
This type of mixture is very stable, i.e., its particles do not settle, or separate.
As a homogeneous mixture, a solution has one phase $($liquid$)$ although the solute and solvent can vary:
for example, salt water. In chemistry, a mixture is a substance containing two or more elements or compounds that are not covalently bound to each other and which retain their own chemical and physical identities; a substance which has two or more constituent physical substances.
This doesn't scatter light the path of light is visible in solution.
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MCQ 71 Mark
In construction of a building, which of the following is used:
  • A
    Water
  • B
    Cement
  • ✓
    Both $A$ and $B$
  • D
    None of these
Answer
Correct option: C.
Both $A$ and $B$
Both $A$ and $B$
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MCQ 81 Mark
Sugar dissolves in water to form sugar$-$water solution. Name the solute.
  • ✓
    Sugar
  • B
    Water
  • C
    Sugar$-$water
  • D
    Sugar $\ \&\ $ water
Answer
Correct option: A.
Sugar
Solute: The minor component in a solution is called solute.
Solvent: The major component in a solution is called solvent.
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MCQ 91 Mark
On the basis of composition of matter, milk is considered to be:
  • A
    A pure substance.
  • ✓
    An impure substance.
  • C
    An element.
  • D
    A compound.
Answer
Correct option: B.
An impure substance.
Milk is considered to be an impure substance as it is an emulsion. Emulsion is a colloid in which minute droplets of one liquid are dispersed in another liquid, which is not miscible with it.
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MCQ 101 Mark
Which one is true solution:
  • ✓
    Sugar sol
  • B
    Blood
  • C
    Starch
  • D
    Ink
Answer
Correct option: A.
Sugar sol

True Solution is a homogeneous mixture of two or more substances in which substance dissolved (solute) in solvent has the particle size of less than $10 - 9 \ m$ or $1 \ nm.$
Simple solution of sugar in water is an example of true solution. Particles of true solution cannot be filtered through filter paper and are not visible to naked eye.
Colloidal Solution is a heterogeneous mixture in which particle size of substance is intermediate of true solution and suspension i.e. between $1-1000 \ nm.$
Smoke from a fire is example of colloidal system in which tiny particles of solid float in air. Just like true solutions, Colloidal particles are small enough and cannot be seen through naked eye.
They easily pass through filter paper.
But colloidal particles are big enough to be blocked by parchment paper or animal membrane.
blood, starch, ink : Colloidal Soln.
sugar sol., salt sol : true soln.

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MCQ 111 Mark
Which of the following are related to apple juice:
  • A
    Element
  • ✓
    Mixture
  • C
    Compounds
  • D
    None of these
Answer
Correct option: B.
Mixture
Apple juice is a fruit juice made by the maceration and pressing of apples.
so its a mixture.
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MCQ 121 Mark
$“$Is malleable and ductile$”$ best describes:
  • A
    A solution.
  • ✓
    A metal.
  • C
    A compound.
  • D
    A non-metal.
Answer
Correct option: B.
A metal.
Metals are malleable and ductile as they can be hammered into thin sheets and can be stretched into wires.
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MCQ 131 Mark
One of the following does not show Tyndall effect. This one is:
  • A
    Soap solution.
  • B
    Ink.
  • ✓
    Sugar solution.
  • D
    Starch solution.
Answer
Correct option: C.
Sugar solution.
Sugar solution does not show Tyndall effect because sugar solution is a true solution and not a colloid.
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MCQ 141 Mark
Which of the following are compounds?
$i. CO$
$ii. No$
$iii. NO$
$iv. Co$
  • A
    $(i)$ and $(ii)$
  • B
    $(ii)$ and $(iii)$
  • ✓
    $(i)$ and $(iii)$
  • D
    $(ii)$ and $(iv)$
Answer
Correct option: C.
$(i)$ and $(iii)$
$CO$ and $NO$ are compounds. While $CO$ is made up of carbon and oxygen, $NO$ is made up of nitrogen and oxygen.
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MCQ 151 Mark
Which of the following substance cannot be broken down by a chemical method?
  • A
    Ammonia $\left(\mathrm{NH}_3\right)$
  • ✓
    Helium $(\mathrm{He})$
  • C
    Methane $\left(\mathrm{CH}_4\right)$
  • D
    Water $\left(\mathrm{H}_2 \mathrm{O}\right)$
Answer
Correct option: B.
Helium $(\mathrm{He})$
Helium $(\mathrm{He})$
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MCQ 161 Mark
One of the following does not undergo sublimation. This one is:
  • A
    Camphor.
  • B
    Dry ice.
  • ✓
    Silica.
  • D
    Iodine.
Answer
Correct option: C.
Silica.
Silica does not sublime on heating.
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MCQ 171 Mark
Arun has prepared $0.01\% ($by mass$)$ solution of sodium chloride in water. Which of the following correctly represents the composition of the solutions?
  • A
    $1.00 g$ of $\text{NaCl} + 100\ g$ of water
  • B
    $0.11g$ of $\text{NaCl} + 100g$ of water
  • ✓
    $0.0l g$ of $\text{NaCl} + 99.99g$ of water
  • D
    $0.10 g$ of $\text{NaCl} + 99.90g$ of water
Answer
Correct option: C.
$0.0l g$ of $\text{NaCl} + 99.99g$ of water
Here, Mass $%=\frac{\text{mass of solute }\times100}{(\text{mass of solute }+\text{ mass of solvent})}$$=\frac{0.01\text{g}\times100}{(0.01+99.99)\text{g}}=\frac{0.01\times100}{100.00}=0.01%$
Which is equal to the percentage of sodium chloride in water prepared by Arun. So, option$(c)$ is correct.
In option$(a)$, Mass$\ \%\ =\frac{1.00\text{g}\times100}{(1.00+100)\text{g}}=\frac{1.00\times100}{101.00}=0.99\%$
In option$(b)$,Mass $\ \%\ =\frac{0.11\text{g}\times100}{(0.11+100)\text{g}}=\frac{11}{100.11}=0.11\%$
In option$(d)$, Mass$\ \%\ =\frac{0.1\text{g}\times100}{(0.1+99.90)\text{g}}=\frac{10}{100}=0.1\%$
These $\ \%\ $ are not equal to the $\ \%\ $ of sodium chloride solution in water prepared by Arun. So, these are incorrect.
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MCQ 181 Mark
Pure iodine can be obtained by the process of $...........$ ?
  • A
    Separating funnel
  • B
    Distillation
  • C
    Filtration
  • ✓
    Sublimation
Answer
Correct option: D.
Sublimation
Iodine can be separated by the process of sublimation.
Sublimation is the process of conversion of material from a solid state directly to a gaseous state.
Iodine undergoes sublimation and the vapour form can be collected and solidified to obtain pure Iodine.
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MCQ 191 Mark
Name the change of state in which naphthalene changes into vapour:
  • A
    Melting
  • B
    Evaporate
  • ✓
    Sublimation
  • D
    Condense
Answer
Correct option: C.
Sublimation
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MCQ 201 Mark
You are provided with a mixture of petroleum and water. You can separate this mixture by_____?
  • ✓
    Distillation
  • B
    Oxidation
  • C
    Reduction
  • D
    Dehydration
Answer
Correct option: A.
Distillation
 (A) Distillation
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MCQ 211 Mark
Salt dissolves in water to form salt water. Name the solvent.
  • A
    Salt
  • ✓
    Water
  • C
    Salt-water
  • D
    Sea water
Answer
Correct option: B.
Water
Salt dissolves into water to form saltwater, here salt is present as a solute and water as a solvent.
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MCQ 221 Mark
Which of the following is not true about sulphur?
  • A
    It is yellow coloured solid.
  • B
    It has low melting point.
  • C
    It is soluble in $\mathrm{CS}_2$.
  • ✓
    It is soluble in water.
Answer
Correct option: D.
It is soluble in water.
Sulfur is a soft, pale yellow, odorless, brittle solid. It is insoluble in water, but soluble in carbon disulfide. It burns with a blue flame, oxidizing to sulfur dioxide. Sulfur exists in several crystalline and amorphous allotropes.
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MCQ 231 Mark
Which of the following is not a suspension:
  • A
    Flour in water
  • B
    Chalk in water
  • C
    Muddy water
  • ✓
    Milk
Answer
Correct option: D.
Milk

Milk is a colloid and is a mixture of fat dispersed and suspended in water.
Suspension is distinguished from colloids by larger particle sizes which settle down when the solution is kept undisturbed, which is the case with the solutions mentioned in $A, B$ and $C.$

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MCQ 241 Mark
The substance which gives colloidal solution in water is:
  • A
    Sugar
  • ✓
    Soap
  • C
    Alum
  • D
    Plaster of paris
Answer
Correct option: B.
Soap
A colloidal solution is a solution in which a material is evenly suspended in a liquid.
Classification of colloids depends on the dispersed phase and the dispersion medium.
The various types are sol, emulsion, foam and aerosol.
Soap is a type of foam in which the dispersion medium is a liquid and the dispersed phase is a gas.
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MCQ 251 Mark
How would you obtain pure ammonium chloride when it contains potassium chloride as an impurity:
  • A
    Chromatography
  • B
    Crystallisation
  • ✓
    Sublimation
  • D
    None of the above
Answer
Correct option: C.
Sublimation
A mixture of ammonium chloride and potassium chloride can be separated using the process of sublimation.
In this case, the sublimable temperatures of ammonium and potassium chloride differ widely.
Between the two, ammonium chloride has a lower sublimable temperature.
Therefore, it sublimes first followed by potassium chloride.
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MCQ 261 Mark
When a mixture of iron powder and sulphur powder is heated strongly to form iron sulphide, then heat energy is:
  • A
    Released.
  • ✓
    First absorbed and then released.
  • C
    Absorbed.
  • D
    Neither absorbed nor released.
Answer
Correct option: B.
First absorbed and then released.
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 $(FeS)$ with the release of huge amount of energy in the form of heat and light.
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MCQ 271 Mark
Milk is an example of :
  • A
    Element
  • ✓
    Mixture
  • C
    Compound
  • D
    All of these
Answer
Correct option: B.
Mixture
A mixture is a material system made up of two or more different substances which are mixed but are not combined chemically.
A mixture refers to the physical combination of two or more substances on which the identities are retained and are mixed.
Milk is an example of mixture.
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MCQ 281 Mark
Which one of the following is most likely to exhibit Tyndall effect?
  • A
    Sugar and water mixture.
  • B
    Potash alum and water mixture.
  • ✓
    Chalk powder and water mixture.
  • D
    Potassium permanganate and water mixture.
Answer
Correct option: C.
Chalk powder and water mixture.
Chalk in water will most likely scatter the beam of light when passed through it because it forms a suspension.
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MCQ 291 Mark
Of the following substance which is an element, a mixture and a compound Sea water is the example of :
  • A
    Element
  • ✓
    Mixture
  • C
    Compounds
  • D
    All of these
Answer
Correct option: B.
Mixture
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MCQ 301 Mark
A mixture of milk and ground oil can be separated by:
  • A
    Sublimation.
  • B
    Evaporation.
  • ✓
    Separating funnel.
  • D
    Filtration.
Answer
Correct option: C.
Separating funnel.
Milk and groundnut oil are two immiscible liquids. So, they can be separated by using a separating funnel.
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MCQ 311 Mark
Which of the following are chemical changes?
  1. Decaying of wood.
  2. Burning of wood
  3. Sawing of wood
  4. Hammering of nail into wood
  • ✓
    $(i)$ and $(ii)$
  • B
    $(ii)$ and $(iii)$
  • C
    $(iii)$ and $(iv)$
  • D
    $(i)$ and $(iv)$
Answer
Correct option: A.
$(i)$ and $(ii)$
The processes in statements $(i)$ and $(ii)$ are chemical changes because decaying and burning causes formation of new compounds; thus they are chemical reactions. The processes in statements $(iii)$ and $(iv)$ are physical changes where no new compounds are formed.
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MCQ 321 Mark
Which of the following are homogeneous mixtures:
  • A
    Sugar water
  • B
    Vinegar
  • C
    Vodka
  • ✓
    All of these
Answer
Correct option: D.
All of these
A homogeneous mixture is a mixture where the components that make up the mixture are uniformly distributed throughout the mixture.
The composition of the mixture is the same throughout.
There is only one phase of matter observed in a homogeneous mixture.
  • air
  • sugar water
  • rain water
  • vodka
  • vinegar
  • dishwashing detergent
  • steel
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MCQ 331 Mark
A few colored glass pieces that are big in size are mixed with sugar. The easiest way to separate them is:
  • A
    Heat the mixture
  • B
    Add the mixture to water
  • ✓
    Handpick the glass pieces
  • D
    Handpick the sugar particles
Answer
Correct option: C.
Handpick the glass pieces
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MCQ 341 Mark
Salt dissolved in water can be recovered by:
  • A
    Decantation
  • B
    Filtration
  • C
    Sedimentation
  • ✓
    Evaporation
Answer
Correct option: D.
Evaporation
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MCQ 351 Mark
Which of the following mixture cannot be separated by using water as the solvent?
  • A
    Copper sulphate and sand.
  • B
    Sand and potash alum.
  • ✓
    Sand and sulphur.
  • D
    Sugar and sand.
Answer
Correct option: C.
Sand and sulphur.
Mixture of sand and sulphur cannot be separated by using water as a solvent because both are insoluble in water.
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MCQ 361 Mark
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is:
  • A
    Chromium.
  • ✓
    Gernmanium.
  • C
    Gallium.
  • D
    Potassium.
Answer
Correct option: B.
Gernmanium.
Germanium is metalloid. It is neither a good conductor of electricity nor an insulator. It is a semiconductor.
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MCQ 371 Mark
Naphthalene can be separated for sand:
  • ✓
    By sublimation.
  • B
    By distillation.
  • C
    By crystallisation.
  • D
    By using water as solvent.
Answer
Correct option: A.
By sublimation.
Naphthalene sublimes on heating, whereas sand does not. So, when the mixture is heated, solid naphthalene turns into vapours, which can be condensed. Sand remains in the container.
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MCQ 381 Mark
To separate ammonium chloride from common salt, we use:
  • A
    Filtration
  • B
    Sedimentation
  • C
    Sieving
  • ✓
    Sublimation
Answer
Correct option: D.
Sublimation
Sublimation is a method in which a solid substance directly changes to the gas phase without changing into the liquid phase.
Ammonium chloride is separated from common salt$($sodium chloride$)$ by sublimation.
This happens because ammonium chloride is volatile in nature whereas common salt is non$-$volatile in nature.
Hence when a mixture of ammonium chloride and common salt is heated, ammonium chloride changes its state from solid to vapour.
The vapours of ammonium chloride are then condensed on a cold surface.
The common salt$($sodium chloride$)$ is left behind.
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MCQ 391 Mark
The elements which normally exist in the liquid state are:
  • A
    Bromine and iodine.
  • B
    Mercury and chlorine.
  • C
    Iodine and mercury.
  • ✓
    Bromine and mercury.
Answer
Correct option: D.
Bromine and mercury.
Mercury is a metal that exists in liquid state and bromine is a non$-$metal that exists in liquid state.
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MCQ 401 Mark
Milk of Magnesia is:
  • A
    A colloid.
  • B
    A true solution.
  • C
    A homogeneous mixture.
  • ✓
    A suspension.
Answer
Correct option: D.
A suspension.
Milk of magnesia is a suspension of magnesium hydroxide in water. It has milk like texture.
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MCQ 411 Mark
Which is the most effective method of separating mixtures of miscible volatile liquids?
  • ✓
    Fractional distilliation
  • B
    Hand picking
  • C
    Chromatography
  • D
    Filtration
Answer
Correct option: A.
Fractional distilliation
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MCQ 421 Mark
Which of the following are chemical changes?
  1. Decaying of wood.
  2. Burning of wood
  3. Sawing of wood
  4. Hammering of nail into wood
  • ✓
    $(i)$ and $(ii)$
  • B
    $(ii)$ and $(iii)$
  • C
    $(iii)$ and $(iv)$
  • D
    $(i)$ and $(iv)$
Answer
Correct option: A.
$(i)$ and $(ii)$
Options $(i)$ Decaying of wood and $(ii)$ Burning of wood are chemical changes, because in these processes, the chemical composition of wood is changed and new substances are formed, which cannot be converted back into their original form.
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MCQ 431 Mark
Among the following statement, point out the incorrect separation technique:
  1. Separation of colloidal particles from solution$-$centrifugation.
  2. Separation of two miscible liquids separating funnel.
  3. Separation of pure substance from its impure form$-$crystallisation.
  4. Separation of components with the help of same solvent$-$chromatogaphy.
  • ✓
    $II$ only
  • B
    $I$ and $II$
  • C
    $III$ and $IV$
  • D
    $II$ and $IV$
Answer
Correct option: A.
$II$ only
A mixture of two miscible liquids can be separated by the process of fractional distillation.
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MCQ 441 Mark
Which one of the following scrap metal cannot be separated by magnetic separation?
  • A
    Nickel.
  • B
    Cobalt.
  • ✓
    Chromium.
  • D
    Steel.
Answer
Correct option: C.
Chromium.
Chromium does not have magnetic property. Therefore, it will not be attracted by a magnet.
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MCQ 451 Mark
Which of the following statement is not true about colloidal solution:
  • A
    These are visible under powerful microscope
  • B
    Their particles do not settle down with passage of time
  • C
    Their particles are electrically charged
  • ✓
    These are homogeneous in nature
Answer
Correct option: D.
These are homogeneous in nature
In colloidal solution, a material is evenly suspended in a liquid, e.g., milk or oil in water is a colloidal solution which is present in two phases in heterogenous phase, e.g., foams, emulsions, sols.
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MCQ 461 Mark
How is scrap$-$iron separated from other wastes in a scrap yard:
  • A
    Sublimation
  • ✓
    Magnetic separation
  • C
    Handpicking
  • D
    Winnowing
Answer
Correct option: B.
Magnetic separation
Waste materials supplied to factories contain a number of scrap metals including iron ore.
So, in factories, scrap iron is separated from the heap of waste materials by using big electromagnets fitted to a crane.
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MCQ 471 Mark
The technique which is used to separate particles of a solid suspended in a liquid quickly is called:
  • A
    Decantation.
  • ✓
    Centrifugation.
  • C
    Sedimentation.
  • D
    Filtration.
Answer
Correct option: B.
Centrifugation.
Centrifugation is a process, in which suspended particles are separated from the solvent. In this process, the solution is rotated at a high rate in a centrifuge thereby separating the solute particles and the solvent.
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MCQ 491 Mark
The best way to recover sugar form an aqueous sugar solution is:
  • A
    Evaporation to dryness.
  • B
    Distillation.
  • C
    Filtration.
  • ✓
    Crytallisation.
Answer
Correct option: D.
Crytallisation.
Crystallisation is a better technique to recover sugar from sugar solution because sugar decomposes or gets charred on heating. Also, the soluble impurities get removed by crystallisation.
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MCQ 501 Mark
A mixture is a / an :
  • A
    Pure substance
  • ✓
    Impure substance
  • C
    Refined substance
  • D
    None of the above
Answer
Correct option: B.
Impure substance
A pure substance has only one kind of atom or molecule and has a definite composition throughout.
A refined substance is a substance without any impurity.
But a mixture is neither pure nor a refined substance.
A mixture consists of different elements or compounds combined physically in an unknown ratio.
The constituents of a mixture are not combined chemically, and so the mixture still shows all the properties of its constituents.
A mixture doesn't have a definite boiling or freezing point.
All of these properties of a mixture make it an impure substance.
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