boiling point of water becomes more than atmospheric pressure

saturated vapour pressure of water is less than atmospheric pressure

vapour pressure of water becomes more than atmospheric pressure

MCQ Questions for Class 11 Medical Chemistry States Of Matter Gases And Liquids Quiz 3

Petrol and kerosene are liquids while nitrogen and oxygen are gases.

0%
True
0%
False

The value of gas constant

$R$ is

$8.314\space X$ . Here

$X$ is represent :

0%
$L \space atm\space K^{-1}\space mol^{-1}$
0%
$cal\space mol^{-1}\space K^{-1}$
0%
$J\space K^{-1}\space mol^{-1}$
0%
None of the above

Explanation

The value of gas constant

$R$ is

$8.314\space X$ . Here

$X$ represents

$J\space K^{-1}\space mol^{-1}$ . The value of

$R$ can also be represented as 0.0826

$L \space atm\space K^{-1}\space mol^{-1}$ or 1.99

$cal\space mol^{-1}\space K^{-1}$ .

Collision frequency

$(Z)$ of a gas at a particular pressure:

0%
Decreases with the rise in temperature
0%
Increases with the rise in temperature
0%
Decreases initially and thereafter increases
0%
Unpredictable

Explanation

Collision frequency

$(Z)$ of a gas at a particular pressure Increases with the rise in temperature.

$Z \propto T^{3/2}$

In a gas equation

$PV = nRT$ , the value of universal gas constant depends upon:

0%
the nature of the gas
0%
the pressure of the gas
0%
the temperature of the gas
0%
the units of measurement

Explanation

In a gas equation

$PV = nRT$ the value of universal gas constant depends upon the units of measurement. Its values are

$\displaystyle 8.314 \: J/mol/K$ or

$\displaystyle 0.0821 L.atm/mol/K$ or

$\displaystyle 2 cal/mol/K$

The total pressure of a mixture of two gases is equal to :

0%
Sum of their partial pressures
0%
The difference in partial pressures
0%
The product of partial pressures
0%
The ratio of partial pressures

Explanation

The total pressure of a mixture of two gases is equal to sum of their partial pressures.
Let

$P_A$ and

$P_B$ be the partial pressures of two gases

$A$ and

$B$ and

$P_T$ be the total pressure of the gaseous mixture.
Then

$\displaystyle P_T = P_A + P_B$

Law of definite proportions when expressed in terms of volumes becomes:

0%
Dalton's Law
0%
Berzelius hypothesis
0%
Gay-Lussac's Law
0%
Avogadro's Law

Water boils when:

0%
saturated vapour pressure of water becomes equal to the atmospheric pressure
0%
boiling point of water becomes more than atmospheric pressure
0%
saturated vapour pressure of water is less than atmospheric pressure
0%
vapour pressure of water becomes more than atmospheric pressure

Explanation

Water boils when saturated vapour pressure of water becomes equal to the atmospheric pressure which is called boiling point of water.

The boiling point of water is $100^{0}C$

Hence option A is correct.

$1$ L of

$O_2$ at

$15^oC$ and

$750$ mm pressure contains

$\text N$ molecules, the number of molecules in

$2$ L of

$SO_2$ under the same conditions of temperature and pressure will be :

0%
$\dfrac {\text N}{2}$
0%
$\text N$
0%
$2\text N$
0%
$4\text N$

Explanation

Under similar conditions of temperature and pressure, equal volume of gas contains equal number of molecules.

$\therefore 1\ L=N$ molecules

$2\ L=2\ N$ molecules

The best evidence for the existence and movement of particles in liquids was provided by ______________.

0%
John Dalton
0%
Thomas Edison
0%
J.J. Thomson
0%
Robert Brown

At standard temperature and pressure, the volume of 7.1 kg of

$Cl_2$ will be:

0%
2240 L
0%
2.24 L
0%
224 L
0%
4.48 L

Explanation

Gram molecular weight of

$Cl_2$ (one mole)= 35.5

$\times$ 2 = 71 g.
71 g of

$Cl_2$ at S.T.P occupies

$22.4$ litres.

$\therefore$ 7.1 kg, i.e., 7100 g of

$Cl_2$ would at STP occupy =

$\displaystyle\dfrac{22.4\times7100}{71} = 2240 L$

According to the kinetic theory of gases there are:

0%
Intermolecular attractions
0%
Molecules which have considerable volume
0%
No intermolecular forces of attraction
0%
The velocity of molecules decreases for each collision

Explanation

Following are the kinetic theory of gases postulates:

1) Space-volume to molecules ratio is negligible.

2)There is no force of attraction between the molecules at normal temperature and pressure. The force of attraction between the molecules build when the temperature decreases and the pressure increases.

3) There is large space between the molecules resulting in continuous motion.

4) The free movement of molecules results in collision which is perfectly elastic.

5) The molecules have kinetic energy due to random movement. But the average kinetic energy of these molecules differs with temperature.

6) Molecules exert pressure on the walls of the container.

Hence, the correct option is

$\text{C}$

In a thermally isolated system. Two boxes filled with an ideal gas are connected by a valve. When the valve is in closed position, states of the box 1 and 2, respectively,are (1 atm,

$V_i T$ ) and (0.5 atm, 4V, T). When the valve is opened, the final pressure of the system is approximately.

0%
0.5 atm
0%
0.6 atm
0%
0.75 atm
0%
1.0 atm

Explanation

$v_i = v_l$

$\displaystyle \frac {5} {2} \times 1 \times V + \frac {5} {2} \times 0.5 \times 4v = \frac {5} {2} P 5V$

$\displaystyle P = \frac {3} {5} = 0.6$
1313616_317133_ans_b2d4e033130147ad993f7efc185ad154.png

Which one of the following is a correct statement?
Ice provides more cooling effect than water at

$273\ K$ .
2. Evaporation of a liquid causes cooling.
3. Increase of pressure lowers the separation between the particles of matter.

0%
$1$ and $2$
0%
$1$ and $3$
0%
$2$ and $3$
0%
$1, 2$ and $3$

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

0%
Avogadro
0%
Dalton
0%
Gay-lussac
0%
None of these

Assertion: Gases do not settle to the bottom of a container.

Reason: Gases have high kinetic energy.

Choose the appropriate option from the following :

0%
If both assertion and reason are true and the reason is the correct explanation of the assertion.
0%
If both assertion and reason are true, but the reason is not the correct explanation of the assertion.
0%
If the assertion is true, but reason is false.
0%
If both the assertion and reason are false.

The boiling point of a liquid with the increase of pressure, ______________.

0%
decreases
0%
increases
0%
remains constant
0%
changes according to the weather

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

0%
If both assertion and reason are true and the reason is a correct explanation of the assertion.
0%
If both assertion and reason are true, but reason is not a correct explanation of the assertion.
0%
If the assertion is true, but reason is false.
0%
If both the assertion and reason are false.
0%
If the assertion is false, but the reason is true.

What is the shape of the meniscus observed when water and mercury are taken in two different capillary tubes?

0%
Concave and convex
0%
Convex and concave
0%
Both concave
0%
Both conves

At Darjeeling, distilled water boils at a temperature _____________.

0%
above $373$ K
0%
above $473$ K
0%
below $373$ K
0%
at $373$ K

Explanation

At Darjeeling, distilled water boils at a temperature below

$373$ K. Boiling of water is affected by altitude, as Darjeeling is at higher altitude water boils at lower temperature than normal.

For which of the following reactions, is Gay Lussac's law not applicable?

0%
Formation of $HI$ from its constituents
0%
Formation of $NH_3$ from its constituents
0%
Formation of $CO_2$ from its constituents
0%
Formation of $SO_3$ from $SO_2$ and $O_2$

Explanation

Gay Lussac's law not applicable to formation of

$CO_{2}$ from its constituents as carbon and oxygen exist in different physical states.

The number of molecules in 1 L of oxygen and 1 L of nitrogen at STP will be:

0%
equal
0%
greater for $N_2$
0%
greater for $O_2$
0%
equal to Avogadro's number

Why does temperature remain constant as a liquid is heated and gets converted to its gaseous state at its boiling point?

0%
Due to increase in potential energy
0%
Due to increase in kinetic energy
0%
Due to decrease in potential energy
0%
Due to decrease in kinetic energy

Considering a given mass of a gas by keeping the third variable constant, identify the wrong statements regarding an ideal gas.
(A) With increase in pressure, volume decreases.
(B) With increase in temperature, pressure decreases.
(C) With increase in temperature, volume increases.

0%
(A) & (B)
0%
(B) & (C)
0%
(A) only
0%
(B) only

Which one of the following is not a category of states of matter?

0%
Solid
0%
Liquid
0%
Gas
0%
Semi-liquid

The existence of the states of matter is due to ___________.

0%
necessity of defining the three states
0%
variation in the characteristics particles of matter
0%
All of the above
0%
None of the above

Which of the following are the properties of solid?

0%
They have a definite shape
0%
They have distinct boundaries
0%
They have fixed volume
0%
All of the above

Why rubber band is considered as a solid?

0%
It takes the shape of the container
0%
It has fixed volume
0%
It has negligible compressibility
0%
It changes shape under force and regains the shape when the force is removed

The decreasing order of compressibility of states of matter is:

0%
gas > solid > liquid
0%
solid > liquid > gas
0%
gas > liquid > solid
0%
liquid > gas > solid

Solids, liquids and gases can diffuse into __________.

0%
solids
0%
liquids
0%
gases
0%
plasma

Assertion: All molecules in a gas have same speed.

Reason: Gas contains molecules of different size and shape.

Choose the appropriate option.

0%
If both assertion and reason are true and the reason is a correct explanation of the assertion.
0%
If both assertion and reason are true, but reason is not a correct explanation of the assertion.
0%
If the assertion is true, but reason is false.
0%
If both the assertion and reason are false.

Water, milk, fruit juice, cold drinks are examples of which states of matter?

0%
Solid
0%
Liquid
0%
Gas
0%
Plasma

Which of the following is solid?

0%
Rubber band
0%
Sugar
0%
Sponge
0%
All of the above

Which of the following order is true about the force of attraction between particles of states of matter?

0%
Gas > Solid > Liquid
0%
Solid > Liquid > Gas
0%
Gas > Liquid > Solid
0%
Liquid > Gas > Solid

Molecules are held together by which type of bonds?

0%
Covalent bonds
0%
Ionic bonds
0%
Both A and B
0%
None of above

The

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

0%
It is triatomic gas
0%
Its internal energy is quite high
0%
There is attraction between its molecules
0%
It solidity at low temperature

Which of the following states of matter are called fluids?

0%
Solid, Gas
0%
Solid, Liquid
0%
Liquid, Gas
0%
Solid, Liquid, Gas

The decreasing order of diffusion is ___________.

0%
Gas > Solid > liquid
0%
Liquid > Gas > Solid
0%
Solid > Liquid > Gas
0%
Gas > Liquid > Solid

Explanation

The spaces between the particles of gas are more so they can mix into each other very easily.

Solid has the least intermolecular space, therefore, it is very difficult to mix with another solid.

On the other hand, liquids have some diffusion ability.

So, the correct option is

$D$

Particles move randomly in _____________.

0%
nitrogen
0%
sugar
0%
ice
0%
water

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:

0%
increases continuously
0%
first increases and then remains constant
0%
first increases and then decreases
0%
none of the above

The decreasing order of the intermolecular spaces between particles of states of matter is _________.

0%
Gas > Liquid > Solid
0%
Liquid > Solid > Liquid
0%
Liquid > Solid > Gas
0%
Solid > Liquid > Gas

The gas which is used for cooking at our home is _____________.

0%
Oxygen
0%
Nitrogen
0%
L.P.G ( liquefied petroleum gas )
0%
C.N.G ( compressed natural gas )

Which is not true about the Kinetic Molecular Theory?

0%
Gas molecules have forces of attraction for each other
0%
Gas molecules move in a random, straight-line motion
0%
Gas molecules have a negligible volume compared to the volume they occupy
0%
Collisions between gas molecules lead to a transfer of energy that is conserved
0%
All of the above statements are correct

Statement 1: According to the Kinetic Moecular Theory, the particles of a gas are in random motion at absolute zero temperature.
Statement 2: The degree of random motion of gas molecules varies inversely with the temperature of the gas.

0%

Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1
0%

Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1
0%

Statement 1 is correct but Statement 2 is not correct
0%

Statement 1 is not correct but Statement 2 is correct
0%

Both the Statement 1 and Statement 2 are not correct

Which one proposes the basic postulates concerning elements and atoms?

0%
Avogadro's number
0%
$P_1V_1=P_2V_2$
0%
$V_1T_2=V_2T_1$
0%
Dalton's theory
0%
Gay-Lussac's Law

The molar volume of

$CO_2$ is maximum at:

0%
$NTP$
0%
$0^o\ C$ and $2.0\ atm$
0%
$127^o\ C$ and $1\ atm$
0%
$273^o\ C$ and $2\ atm$

A sample of neon gas is contained by a closed 4-litre vessel. The temperature of container is 25

$^oC$ and pressure is 1.5 atmospheres. (The gas constant,

$R$ , is equal to 0.08

$Latm/ \:mol/ \: K$ ).
Neon gas in the vessel is replaced with an equal molar quantity of helium gas. Which of the following properties of the gas in the container will be changed?
I. Pressure
II. Temperature
III. Density

0%
I only
0%
II only
0%
III only
0%
I and II only
0%
II and III only

Find the new volume of the gas, when kelvin temperature and pressure of a fixed amount of gas is doubled?

0%
Twice its original volume
0%
Unchanged
0%
One-half its original volume
0%
One-fourth its original volum
0%
Four times greater than its original volume

Explanation

The new volume of the gas, when kelvin temperature and pressure of a fixed amount of gas is doubled is unchanged.
Volume is directly proportional to the ratio

$\displaystyle\dfrac {T}{P}$ .

$\displaystyle V \propto \dfrac {T}{P}$
When kelvin temperature and pressure of a fixed amount of gas is doubled, the ratio

$\displaystyle \dfrac {T}{P}$ is unchanged and the new volume is same as old volume.

According to the Kinetic-Molecular Theory, the kinetic energy of the molecules increases when they are --------------

0%
mixed with other molecules at lower temperature
0%
frozen into a solid
0%
condensed into a liquid
0%
heated to a higher temperature
0%
Collide with each other in a container at a lower temperature

Explanation

According to the Kinetic-Molecular Theory, the kinetic energy of the molecules increases when they are heated to a higher temperature.

The kinetic energy is directly proportional to the absolute temperature.
Kinetic energy

$\displaystyle \propto$ absolute temperature.

As temperature increases, kinetic energy increases.
As temperature decreases, kinetic energy decreases.

Which one is correct about Gay-Lussac's law?

0%
V/T $=$ k
0%
P/T $=$ k
0%
PV $=$ k
0%
$P_T=P_1+P_2+P_3$
0%
PT $=$ k

Explanation

According to Gay-Lussac's Law :

$\displaystyle \dfrac {P}{T}= k$

At constant volume, the pressure of a given mass of a gas varies directly with the temperature.

$\displaystyle P \propto T$ (V and n constant)

Hence, the correct option is B.

Which one proposes a relationship between the combining volumes of gases with respect to the reactants and gaseous products.

0%
Avogadro's number
0%
$P_1V_1=P_2V_2$
0%
$V_1T_2=V_2T_1$
0%
Dalton's Theory
0%
Gay-Lussac's Law

CBSE Questions for Class 11 Medical Chemistry States Of Matter Gases And Liquids Quiz 3 - MCQExams.com

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Practice Class 11 Medical Chemistry Quiz Questions and Answers

CBSE Questions for Class 11 Medical Chemistry States Of Matter Gases And Liquids Quiz 3 - MCQExams.com

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Practice Class 11 Medical Chemistry Quiz Questions and Answers

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