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CBSE Questions for Class 9 Chemistry Matter In Our Surroundings Quiz 7 - MCQExams.com
CBSE
Class 9 Chemistry
Matter In Our Surroundings
Quiz 7
A kind of matter which can sublime is:
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water
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plastic
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milk
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iodine
Explanation
When a substance is sublime, it actually gets converted from solid to a gaseous state without passing through the liquid state.
The substances which undergo sublimation are camphor, Iodine. Water, plastic, and milk cannot undergo sublimation.
Hence option D is correct.
Solids are:
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more dense
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less dense
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least dense
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highly compressible
Explanation
Molecule distance in solid is very small in comparison to gas and liquid. So it is denser than Liquid and Gas.
Option A is correct.
The molecules:
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in solid, liquid and gas move freely anywhere.
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in a solid move freely within its boundary.
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in a liquid move within its boundary.
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in a gas move only within its boundary.
Explanation
In solids, the molecules are tightly packed and they cannot move freely. Therefore, options (A) and (B) are incorrect.
In gas, the molecules can move freely anywhere and do not have any fixed boundary. Therefore, option (D) is incorrect.
In liquids, the molecules can move freely but only within its boundary. Option (C) is correct.
The state of matter which has no definite shape or volume is called
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solid
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liquid
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gas
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water
Explanation
Gases do not have definite shape or volume, liquids have definite volume but no definite shape and solids have definite shape and volume.
So correct option is C.
A mortar and pestle is used for evaporation.
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True
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False
Explanation
Mortar and pestle are used to grind and crush solid substances into powder.
Hence, the given statement is false.
Write true or false. Rewrite the false statement correctly.
Matter cannot exist in different states.
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True
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False
Explanation
The given statement is $$\mathrm{false}$$.
Matter can exist in one of three main states solid, liquid, or gas.
Identify the correct statement about gases:
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Gases can not be compressed easily.
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Gases occupy the entire space of the container.
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Gases have definite shapes.
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Gases can not flow.
Explanation
Gases can be easily compressed with pressure and they do not have a definite shape or size. Also, they can easily flow. Hence, when do we fill a container with some gas it will occupy the entire space of the container.
Therefore, the correct option is B.
A substance which can not sublime is:
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iodine
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camphor
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sugar
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dry ice
Explanation
Sublimation is the process in which a solid directly changes into a gaseous phase without converting it into liquid.
A substance that can not sublime among the given options is
sugar.
Iodine, camphor, and dry ice are sublimable.
A solid is a state of matter that has
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no definite shape.
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large intermolecular space.
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high intermolecular force of attraction.
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no definite volume.
Explanation
In solids the molecules are very closely packed and therefore the intermolecular distances are very little.
The intermolecular force is inversely proportional to the intermolecular distance. Therefore, when the distances are very small the forces of attraction will be very high. Correct answer is option $$C$$.
Which of the following is a property of liquids?
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They can flow.
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They are malleable.
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They have a definite shape.
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They are rigid.
Explanation
Liquids are not malleable or rigid. The do not have a definite shape but have a definite volume. They can flow as their molecules tend to spread out because of the less inter-particle forces of attraction.
Burning requires
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Air
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Fuel
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Nitrogen
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Heat
Explanation
Conditions necessary for combustion:
There must be Fuel to burn.
There must be Air to supply oxygen.
There must be Heat (ignition temperature) to start and continue the combustion process.
Write true or false for the following statement:
Evaporation takes place over the entire mass of the liquid.
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True
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False
Explanation
False, Because evaporation is a surface phenomenon. It occurs only at the surface.
Write true or false:
The temperature of a substance remains unaffected during its change of state.
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True
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False
Explanation
True, the temperature of any substance remains constant because the heat supplied to increase the temperature is utilized in changing the state of matter. This is because of latent heat.
Solids can be compressed easily.
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True
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False
Explanation
Solids are held in fixed positions, they can only vibrate. Because the particles can not move, solids have a definite shape and volume, and can't flow. Because the particles are already packed closely together, solids can't easily be compressed.
Hence, the given statement is f
alse.
A kind of matter which can sublime is:
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water
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plastic
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milk
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iodine
Explanation
Iodine is a sublimable substance, it changes directly into vapour, from solid on heating, without changing into liquid.
Hence, Option "D" is the correct answer.
Matter cannot exist in different states.
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True
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False
Explanation
Matter can exist in different states like solid, liquid or gas depending on how closely packed its atoms or molecules are.
Hence, given statement is false.
There is no difference between evaporation and boiling.
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True
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False
Explanation
Evaporation is conversion of liquid to vapours below the boiling point of the liquid whereas b
oiling is conversion of liquid to vapours at boiling point.
Hence, given statement is False.
All kinds of matter
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occupy space and have definite mass
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have mass and definite shape
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can change their states
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have definite volume
Explanation
Matter is the one that occupy space and has mass.
Hence, Option "A" is the correct answer.
Select the correct alternative
The molecules can move freely anywhere in_____ state.
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gaseous
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liquid
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solid
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none of the above
Explanation
The atoms and molecules in gaseous are much more spread out than in solids or liquids. They are having the largest inter-particle space between them. They can move freely at high speeds in all directions. Molecules in solid and liquid states can not move freely anywhere.
Hence, option $$A$$ is correct.
The gaseous state has
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fixed shape
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no fixed shape and volume
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fixed volume
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fixed mass
Explanation
Gases do not have a fixed shape and volume because particles in gases have a low force of attraction and have large intermolecular spaces, which enables the particles to move freely. Hence option B is correct.
The temperature of melting ice remains constant for some time even if we continue to supply heat to the beaker. This is because of the heat energy ?
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is radiated out
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is used to overcome the forces of attraction between the particles
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is used to change the pressure on the particles
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is used to bring the particles of matter closer
Explanation
the temperature remains constant during boiling of water even though heat is supplied constantly because all the heat energy provided is used in changing the state of water from liquid to gas is water vapor therefore all the heat energy provided increases the kinetic energy of the particles and temperature does not increase.
Which of the following statements are false? Rewrite them correctly.
Evaporation is the process by which liquid turns into gas.
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True
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False
Explanation
$$\text{True}$$
Evaporation is the process by which liquid turns into a gaseous or vapor state. When the liquid molecule is gets heated, the molecules start moving and vibrating more freely. If this heat energy is sufficient to overcome the forces of attraction between them, then they escape into the atmosphere as molecules of vapor.
What is the change in substance when temperature is increased?
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Weight decrease
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Weight inecrease
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Volume decrease
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Volume inecrease
Explanation
When the temperature of a state of matter is increased, heat is absorbed by the substance in the form of energy. The kinetic energy of the molecules of the substance increase. The molecules experience a lot of vibration and occupy more space. As a result, a substance expands, and its volume increases.
What is incorrect about gas?
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Intermolecular forces are maximum
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Shape is not definite
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Volume is not definite
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Is compressible
Explanation
In gases, inter-molecular forces are minimum as compared to their liquid and solid forms.
The heat gained or lost during a change of state from solid to liquid or from liquid to solid is called the latent heat of .......
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fusion
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freezing
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vaporisation
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condensation
Explanation
The heat associated with the melting of a solid or freezing of a liquid is called the latent heat of fusion. This heat remains hidden as no rise in temperature is observed on its absorption until the phase change is completed, so it is called latent, which means hidden.
Latent heat of vaporisation is the heat associated with vaporisation of a liquid or condensation of vapour.
Freezing and condensation are processes by which liquid changes to ice and gas changes to liquid respectively. Hence option A is correct.
Venu blows air into the straw as shown above. What will he observe?
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Air bubbles escape into the beaker
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The pressure in the basin increases
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The water level in the beaker increases
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The water level in the basin increases
Explanation
When Venu blows the straw, he applies pressure by pushing air into which form air bubbles in water, the pressure in the basin increases and the water level in the beaker increases. The air bubbles formed in the water escape into the beaker.
Which of the following applications illustrate that evaporation leads to cooling?
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Only (i) and (ii)
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Only (ii) and (iii)
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Only (i) and (iii)
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(i), (ii) and (iii)
Match Column I with Column II and select the correct option from the codes given below
Column I
Column II
(a) Drying of clothes on a windy day
(i) Time taken for evaporation increases
(b) Liquefaction of gases
(ii) Decreasing pressure and increasing temperature
(c) Change in state of dry ice from solid to gas
(iii) Increasing pressure and decreasing temperature
(d) Less cooling effect of sweating in coastal areas
(iv) Rate of evaporation increases
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a - (i), b - (ii), c - (iii), d - (iv)
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a - (iv), b - (iii), c - (i), d - (ii)
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a - (iii), b - (iv), c - (ii), d - (i)
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a - (iv), b - (iii), c - (ii), d - (i)
Explanation
Drying clothes on a windy day becomes easier because the rate of evaporation increases. And this is because of wind as wind flows it takes water molecules along with it and evaporation increases.
As we increase pressure and decrease the temperature, gases liquefy.
Change in state of dry ice from solid to gas is sublimation and this happens as we increase temperature and decrease pressure.
Option $$D$$ is correct.
Which of the following is a correct statement?
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The inter-particle force of attraction between the molecules in a liquid is less when compared to solids.
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The inter-particle force of attraction between the molecules in a liquid is more when compared to solids.
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The inter-particle force of attraction between the molecules in a liquid is either more or less when compared to solids.
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There is no inter-particle force of attraction between the molecules in a liquid.
Explanation
The inter-particle force of attraction between the molecules in a liquid is less when compared to solids. Due to this, liquids have no definite shape, unlike solids that have a definite shape.
Intermolecular space is the least in?
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water
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steam
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ice
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all of them
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