NEET > States of Matter: Gases and Liquids

Explore popular questions from States of Matter: Gases and Liquids for NEET. This collection covers States of Matter: Gases and Liquids previous year NEET questions hand picked by popular teachers.


Q 1.    

Correct4

Incorrect-1

Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both can escape. What fraction of the oxygen escapes in the time required for one - half of the hydrogen to escape?

A

{tex} 3/ 8 {/tex}

B

{tex} 1/ 2 {/tex}

{tex} 1/ 8 {/tex}

D

{tex}1 / 4 {/tex}

Explanation


Q 2.    

Correct4

Incorrect-1

A gas such as carbon monoxide would be most likely to obey the ideal gas law at

A

low temperatures and high pressures

B

high temperatures and high pressures

C

low temperatures and low pressures

high temperatures and low pressures.

Explanation


Q 3.    

Correct4

Incorrect-1

Maximum deviation from ideal gas is expected from

A

{tex} \mathrm { CH } _ { 4 ( g ) } {/tex}

{tex} \mathrm { NH } _ { 3 ( g ) } {/tex}

C

{tex} \mathrm { H } _ { 2 ( \mathrm { g } ) } {/tex}

D

{tex} \mathrm { N } _ { 2 ( \mathrm { g } ) } {/tex}

Explanation


Q 4.    

Correct4

Incorrect-1

What is the density of {tex} \mathrm { N } _ { 2 } {/tex} gas at {tex} 227 ^ { \circ } \mathrm { C } {/tex} and {tex} 5 {/tex} atm. pressure? {tex} \left( R = 0.082 \ \mathrm { L }\ \mathrm { atm } \ \mathrm { K } ^ { - 1 }\ \mathrm { mol } ^ { - 1 } \right) {/tex}

A

{tex} 1.40\ \mathrm { g } / \mathrm { mL } {/tex}

B

{tex} 2.81 \ \mathrm { g } / \mathrm { mL } {/tex}

{tex} 3.41\ \mathrm { g } / \mathrm { mL } {/tex}

D

{tex} 0.29 \ \mathrm { g } / \mathrm { mL } {/tex}

Explanation


Q 5.    

Correct4

Incorrect-1

50 mL of each of gas {tex} A {/tex} and of gas {tex} B {/tex} takes 150 and 200 seconds respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas {tex} B {/tex} is 36 , the molecular mass of gas {tex} A {/tex} will be

A

96

B

128

C

32

None of the above

Explanation

Q 6.    

Correct4

Incorrect-1

A certain gas takes three times as long to effuse out as helium. Its molecular mass will be

A

27{tex}\ \mathrm u {/tex}

36{tex}\ \mathrm u {/tex}

C

64{tex}\ \mathrm u {/tex}

D

9{tex}\ \mathrm u {/tex}

Explanation


Q 7.    

Correct4

Incorrect-1

For real gases van der Waals equation is written as {tex} \left( p + \frac { a n ^ { 2 } } { V ^ { 2 } } \right) ( V - n b ) = n R T {/tex} where {tex} a {/tex} and {tex} b {/tex} are van der Waals constants. Two sets of gases are
{tex}\mathrm {(I) \ O_2, \ CO_2, \ H_2\ and\ He}{/tex}
{tex}\mathrm {(II) \ CH_4, \ O_2, \ and\ H_2 }{/tex}
The gases given in set-{tex}\mathrm I{/tex} in increasing order of {tex}b{/tex} and gases given in set-{tex}\mathrm {II}{/tex} in decreasing order of {tex}a{/tex}, are arranged below. Select the correct order from the following

A

{tex} \mathrm {(I)}\ \mathrm{ He } < \mathrm { H } _ { 2 } < \mathrm { CO } _ { 2 } < \mathrm { O } _ { 2 } \ \mathrm{ (II)} \ \mathrm { CH } _ { 4 } > \mathrm { H } _ { 2 } > \mathrm { O } _ { 2 } {/tex}

B

{tex} \mathrm {(I)}\ \mathrm { O } _ { 2 } < \mathrm { He } < \mathrm { H } _ { 2 } < \mathrm { CO } _ { 2 }\ ( \mathrm { II } )\ \mathrm { H } _ { 2 } > \mathrm { O } _ { 2 } > \mathrm { CH } _ { 4 } {/tex}

{tex} \mathrm{ (I)} \ \mathrm { H } _ { 2 } < \mathrm { He } < \mathrm { O } _ { 2 } < \mathrm { CO } _ { 2 } \ \mathrm {(II)} \ \mathrm { CH } _ { 4 } > \mathrm { O } _ { 2 } > \mathrm { H } _ { 2 } {/tex}

D

{tex} \mathrm{ (I)} \ \mathrm { H } _ { 2 } < \mathrm { O } _ { 2 } < \mathrm { He } < \mathrm { CO } _ { 2 }\ ( \mathrm { II } )\ \mathrm { O } _ { 2 } > \mathrm { CH } _ { 4 } > \mathrm { H } _ { 2 } {/tex}

Explanation


Q 8.    

Correct4

Incorrect-1

Equal volumes of two monatomic gases, {tex} A {/tex} and {tex} B {/tex} at same temperature and pressure are mixed. The ratio of specific heats {tex} \left( C _ { P } / C _ { V } \right) {/tex} of the mixture will be

A

0.83

B

1.50

C

3.3

1.67

Explanation


Q 9.    

Correct4

Incorrect-1

By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?

A

2.0

B

2.8

C

4.0

1.4

Explanation

Q 10.    

Correct4

Incorrect-1

Two gases {tex} A {/tex} and {tex} B {/tex} having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of {tex} A {/tex} is 49 u. Molecular mas of {tex} B {/tex} will be

A

50.00{tex}\ \mathrm { u } {/tex}

12.25{tex}\ \mathrm { u } {/tex}

C

6.50{tex}\ \mathrm u {/tex}

D

25.00{tex}\ \mathrm { u } {/tex}

Explanation

Q 11.    

Correct4

Incorrect-1

A gaseous mixture was prepared by taking equal mole of {tex} \mathrm { CO } {/tex} and {tex} \mathrm { N } _ { 2 } {/tex} . If the total pressure of the mixture was found 1 atmosphere, the partial pressure of the nitrogen {tex} \left( \mathrm { N } _ { 2 } \right) {/tex} in the mixture is

0.5{tex} \mathrm { atm } {/tex}

B

0.8{tex} \mathrm { atm } {/tex}

C

0.9{tex} \mathrm { atm } {/tex}

D

1{tex} \mathrm { atm } {/tex}

Explanation

Q 12.    

Correct4

Incorrect-1

A bubble of air is underwater at temperature {tex} 15 ^ { \circ } \mathrm { C } {/tex} and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is {tex} 25 ^ { \circ } \mathrm { C } {/tex} and the pressure is {tex} 1.0 \mathrm { bar } , {/tex} what will happen to the volume of the bubble?

Volume will become greater by a factor of {tex} 1.6 . {/tex}

B

Volume will become greater by a factor of {tex} 1.1 . {/tex}

C

Volume will become smaller by a factor of 0.70 .

D

Volume will become greater by a factor of {tex} 2.5 . {/tex}

Explanation



Q 13.    

Correct4

Incorrect-1

The pressure exerted by 6.0 g of methane gas in a 0.03{tex} \mathrm { m } ^ { 3 } {/tex} vessel at {tex} 129 ^ { \circ } \mathrm { C } {/tex} is (Atomic masses: {tex} \mathrm { C } = 12.01 , \mathrm { H } = 1.01 {/tex} and {tex} R = 8.314 \mathrm { JK } ^ { - 1 } \mathrm { mol } ^ { - 1 } {/tex} )

A

215216{tex} \mathrm { Pa } {/tex}

B

13409{tex} \mathrm { Pa } {/tex}

41648{tex} \mathrm { Pa } {/tex}

D

31684{tex} \mathrm { Pa } {/tex}

Explanation


Q 14.    

Correct4

Incorrect-1

The energy absorbed by each molecule({tex}A_2{/tex}) of a substance is {tex}4.4\times 10^{-19} \mathrm J {/tex} and bond energy per molecule is {tex}4.0\times 10^{-19} \mathrm J {/tex}. The kinetic energy of the molecule per atom will be

A

{tex} 2.2 \times 10 ^ { - 19 } \mathrm { J } {/tex}

B

{tex} 2.0 \times 10 ^ { - 19 } \mathrm { J } {/tex}

C

{tex} 4.0 \times 10 ^ { - 20 } \mathrm { J } {/tex}

{tex} 2.0 \times 10 ^ { - 20 } \mathrm { J } {/tex}

Explanation


Q 15.    

Correct4

Incorrect-1

If a gas expands at constant temperature, it indicates that

kinetic energy of molecules remains the same

B

number of the molecules of gas increases

C

kinetic energy of molecules decreases

D

pressure of the gas increases

Explanation



Q 16.    

Correct4

Incorrect-1

Volume occupied by one molecule of water (density = 1 g cm{tex} ^ { - 3 }{/tex}) is

{tex} 3.0 \times 10 ^ { - 23 } \mathrm { cm } ^ { 3 } {/tex}

B

{tex} 5.5 \times 10 ^ { - 23 } \mathrm { cm } ^ { 3 } {/tex}

C

{tex} 9.0 \times 10 ^ { - 23 } \mathrm { cm } ^ { 3 } {/tex}

D

{tex} 6.023 \times 10 ^ { - 23 } \mathrm { cm } ^ { 3 } {/tex}

Explanation


Q 17.    

Correct4

Incorrect-1

van der Waal's real gas, acts as an ideal gas, at which conditions?

High temperature, low pressure

B

Low temperature, high pressure

C

High temperature, high pressure

D

Low temperature, low pressure

Explanation


Q 18.    

Correct4

Incorrect-1

Average molar kinetic energy of {tex} \mathrm { CO } {/tex} and {tex} \mathrm { N } _ { 2 } {/tex} at same temperature is

{tex} K E _ { 1 } = K E _ { 2 } {/tex}

B

{tex} K E _ { 1 } > K E _ { 2 } {/tex}

C

{tex} K E _ { 1 } < K E _ { 2 } {/tex}

D

can't say any thing. Both volumes are not given.

Explanation


Q 19.    

Correct4

Incorrect-1

At {tex} 25 ^ { \circ } \mathrm { C } {/tex} and 730{tex} \mathrm { mm } {/tex} pressure, 380{tex} \mathrm { mL } {/tex} of dry oxygen was collected. If the temperature is constant, what volume will the oxygen occupy at 760{tex} \mathrm { mm } {/tex} pressure?

A

569{tex} \mathrm { mL } {/tex}

365{tex} \mathrm { mL } {/tex}

C

265{tex} \mathrm { mL } {/tex}

D

621{tex} \mathrm { mL } {/tex}

Explanation


Q 20.    

Correct4

Incorrect-1

Which of the following statements is wrong for gases?

A

Confined gas exerts uniform pressure on the walls of its container in all directions.

B

Volume of the gas is equal to volume of container confining the gas.

C

Gases do not have a definite shape and volume.

Mass of a gas cannot be determined by weighing a container in which it is enclosed.

Explanation


Q 21.    

Correct4

Incorrect-1

The average kinetic energy of an ideal gas, per molecule in S.I. units, at {tex} 25 ^ { \circ } \mathrm { C } {/tex} will be

A

{tex} 6.17 \times 10 ^ { - 20 } \mathrm { J } {/tex}

B

{tex} 7.16 \times 10 ^ { - 20 } \mathrm { J } {/tex}

C

{tex} 61.7 \times 10 ^ { - 21 } \mathrm { J } {/tex}

{tex} 6.17 \times 10 ^ { - 21 } \mathrm { J } {/tex}

Explanation


Q 22.    

Correct4

Incorrect-1

At what temperature, the rate of effusion of {tex} \mathrm { N } _ { 2 } {/tex} would be 1.625 times than the rate of {tex} \mathrm { SO } _ { 2 } {/tex} at {tex} 500 ^ { \circ } \mathrm { C } ? {/tex}

A

{tex} 373 ^ { \circ } \mathrm { C } {/tex}

{tex} 620 ^ { \circ } \mathrm { C } {/tex}

C

{tex} 110 ^ { \circ } \mathrm { C } {/tex}

D

{tex} 173 ^ { \circ } \mathrm { C } {/tex}

Explanation


Q 23.    

Correct4

Incorrect-1

Which of the following mixture of gases does not obey Dalton's Law of partial pressure?

{tex} \mathrm { Cl } _ { 2 } {/tex} and {tex} \mathrm { SO } _ { 2 } {/tex}

B

{tex} \mathrm { CO } _ { 2 } {/tex} and {tex} \mathrm { He } {/tex}

C

{tex} \mathrm { O } _ { 2 } {/tex} and {tex} \mathrm { CO } _ { 2 } {/tex}

D

{tex} \mathrm { N } _ { 2 } {/tex} and {tex} \mathrm { O } _ { 2 } {/tex}

Explanation



Q 24.    

Correct4

Incorrect-1

An ideal gas, obeying kinetic theory of gases can not be liquefied, because

A

it solidifies before becoming a liquid

forces acting between its molecules are negligible

C

its critical temperature is above {tex} 0 ^ { \circ } \mathrm { C } {/tex}

D

its molecules are relatively small in size.

Explanation


Q 25.    

Correct4

Incorrect-1

50 mL of hydrogen diffuses out through a small hole of a vessel, in 20 minutes. The time taken by 40 mL of oxygen to diffuse out is

A

32 minutes

64 minutes

C

8 minutes

D

12 minutes

Explanation