States of Matter Test

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States of Matter Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

At same temperature and pressure equal volumes of two or more gases have the equal numbers of atoms. Above hypothesis was given by

A
Avogadro

B
Dalton

C
Gay-lussac

D
None of these

Solution

At the same temperature and same pressure, equal volumes of gases contain equal number of atoms. This statement was given by Berzilius.
Question 2
1 / -0

Molecules are held together by which type of bonds?

A
Covalent bonds

B
Ionic bonds

C
Both A and B

D
None of above

Solution

Ionic bonding and covalent bonding is between different atoms, not between different molecules. Molecules are rather held together by different inter-molecular forces of attraction.
Question 3
1 / -0

Pressure is exerted by gases due to their ___________.

A
circular motion

B
linear motion

C
random motion

D
vibratory motion

Solution

Pressure is exerted by gases due to their random motion.
Question 4
1 / -0

Assertion: Gases do not settle to the bottom of a container.
Reason: Gases have high kinetic energy.

Choose the appropriate option from the following :

A
If both assertion and reason are true and the reason is the correct explanation of the assertion.

B
If both assertion and reason are true, but the reason is not the correct explanation of the assertion.

C
If the assertion is true, but reason is false.

D
If both the assertion and reason are false.

Solution

Gases do not settle to the bottom because of its kinetic energy. They are always in random motion.

Because of the small mass, the effect of gravity on them is negligible.

Hence, both the assertion and reason are correct and the reason is the correct explanation of the assertion.
Question 5
1 / -0

Assertion: Wet air is heavier than dry air.
Reason: The density of dry air is more than density of water.

A
If both assertion and reason are true and the reason is a correct explanation of the assertion.

B
If both assertion and reason are true, but reason is not a correct explanation of the assertion.

C
If the assertion is true, but reason is false.

D
If both the assertion and reason are false.

E
If the assertion is false, but the reason is true.

Solution

Wet air is heavier than dry air because wet air contains water droplets in form of moisture so its density increases than that of dry air which is free from moisture.
Question 6
1 / -0

The $$CO_{2}$$ gas does not follow gaseous laws at all ranges of pressure and temperature because :

A
It is triatomic gas

B
Its internal energy is quite high

C
There is attraction between its molecules

D
It solidity at low temperature

Solution

Real gases do not follow gas laws at all temperature and pressure conditions due to two wrong assumptions in kinetic molecular theory of gases:
(i) The volume occupied by gas molecules is negligible. It is not true because gas molecules do occupy small volume.
(ii) The forces of attraction between gas molecules are zero. It is not true because attractive forces are present between molecules of real gases.
Question 7
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For which of the following reactions, is Gay Lussac's law not applicable?

A
Formation of $$HI$$ from its constituents

B
Formation of $$NH_3$$ from its constituents

C
Formation of $$CO_2$$ from its constituents

D
Formation of $$SO_3$$ from $$SO_2$$ and $$O_2$$

Solution

Gay Lussac's law not applicable to formation of $$CO_{2}$$ from its constituents as carbon and oxygen exist in different physical states.
Question 8
1 / -0

Assertion: All molecules in a gas have same speed.
Reason: Gas contains molecules of different size and shape.

Choose the appropriate option.

A
If both assertion and reason are true and the reason is a correct explanation of the assertion.

B
If both assertion and reason are true, but reason is not a correct explanation of the assertion.

C
If the assertion is true, but reason is false.

D
If both the assertion and reason are false.

Solution

All molecules of a gas are identical in shape and size but have different energies due to which they have different speeds.
Hence, both assertion and reason are false.
Question 9
1 / -0

A closed vessel is maintained at a constant temperature. It is first evacuated and then vapour is injected into it continuously. The pressure of the vapour in the vessel is:

A
increases continuously

B
first increases and then remains constant

C
first increases and then decreases

D
none of the above

Solution

The molecules of a gas are in a state of random motion. They continuously collide against the walls of the container. Even at ordinary temperature and pressure, the number of molecular collisions with walls is very large. During each collision, certain momentum is transferred to the walls of the container. The pressure exerted by the gas is due to continuous bombardment of gas molecules against the walls of the container. Due to this continuous bombardment, the walls of the container experience a continuous force which is equal to the total momentum imparted to the walls per second. The average force experienced per unit area of the walls of the container determines the pressure exerted by the gas. This should be clear from the fact that although the molecule collisions are random, the pressure remains constant.
Question 10
1 / -0

Which is not true about the Kinetic Molecular Theory?

A
Gas molecules have forces of attraction for each other

B
Gas molecules move in a random, straight-line motion

C
Gas molecules have a negligible volume compared to the volume they occupy

D
Collisions between gas molecules lead to a transfer of energy that is conserved

E
All of the above statements are correct

Solution

The kinetic molecular theory is based on the following postulates, or assumptions.
-Gases are composed of a large number of particles that behave like hard, spherical objects in a state of constant, random motion.
-These particles move in a straight line until they collide with another particle or the walls of the container.
-These particles are much smaller than the distance between particles. Most of the volume of a gas is therefore empty space.
-There is no force of attraction between gas particles or between the particles and the walls of the container.
-Collisions between gas particles or collisions with the walls of the container are perfectly elastic. None of the energy of a gas particle is lost when it collides with another particle or with the walls of the container.
-The average kinetic energy of a collection of gas particles depends on the temperature of the gas and nothing else.

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States of Matter Test - 16

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States of Matter Test - 16

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Question 1

Avogadro

Dalton

Gay-lussac

None of these

Solution

Question 2

Covalent bonds

Ionic bonds

Both A and B

None of above

Solution

Question 3

circular motion

linear motion

random motion

vibratory motion

Solution

Question 4

If both assertion and reason are true and the reason is the correct explanation of the assertion.

If both assertion and reason are true, but the reason is not the correct explanation of the assertion.

If the assertion is true, but reason is false.

If both the assertion and reason are false.

Solution

Question 5

If both assertion and reason are true and the reason is a correct explanation of the assertion.

If both assertion and reason are true, but reason is not a correct explanation of the assertion.

If the assertion is true, but reason is false.

If both the assertion and reason are false.

If the assertion is false, but the reason is true.

Solution

Question 6

It is triatomic gas

Its internal energy is quite high

There is attraction between its molecules

It solidity at low temperature

Solution

Question 7

Formation of $$HI$$ from its constituents

Formation of $$NH_3$$ from its constituents

Formation of $$CO_2$$ from its constituents

Formation of $$SO_3$$ from $$SO_2$$ and $$O_2$$

Solution

Question 8

If both assertion and reason are true and the reason is a correct explanation of the assertion.

If both assertion and reason are true, but reason is not a correct explanation of the assertion.

If the assertion is true, but reason is false.

If both the assertion and reason are false.

Solution

Question 9

increases continuously

first increases and then remains constant

first increases and then decreases

none of the above

Solution

Question 10

Gas molecules have forces of attraction for each other

Gas molecules move in a random, straight-line motion

Gas molecules have a negligible volume compared to the volume they occupy

Collisions between gas molecules lead to a transfer of energy that is conserved

All of the above statements are correct

Solution

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