NEET Chemistry MCQ: NCERT Molecular Velocities | NEET.Guide Questions

A gas effuses through a small orifice at a rate r. If the temperature is quadrupled and the molar mass is halved, what is the new effusion rate?

A

r

B

2r

C

4r

D

2√2r

Question Tags

📚 Subject:Chemistry

📑 Chapter:States Of Matter

🎯Topic:Molecular Velocities

🎓 Ncert Level:Application

🎯Difficulty :Hard

⚡ Time Required :2 mins

🔄Ncert Concepts :Kinetic Theory of Gases, Graham's Law of Effusion

Related Questions

Ratio of average to most probable velocity is

A

$1.128$

B

$1.224$

C

$1.0$

D

$1.112$

Question Tags

📚 Subject:Chemistry

📑 Chapter:States Of Matter

🎯Topic:Molecular Velocities

🎓 Ncert Level:Remembering

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :Kinetic Theory of Gases, Average Velocity, Most Probable Velocity

If ${C_1},{C_2},{C_3}$ .... represent the speeds of ${n_1},{n_2},{n_3}, \ldots$ molecules, then the root mean square speed is:

A

${\left[ {\frac{{{n_1}C_1^2 + {n_2}C_2^2 + {n_3}C_3^2 + \ldots }}{{{n_1} + {n_2} + {n_3} + \ldots }}} \right]^{1/2}}$

B

${\left[ {\frac{{n_1^2C_1^2 + n_2^2C_2^2 + n_3^2C_3^2 + \ldots }}{{{n_1} + {n_2} + {n_3} + \ldots }}} \right]^{1/2}}$

C

$\frac{{{{\left( {{n_1}C_1^2} \right)}^{1/2}}}}{{{n_1}}} + \frac{{{{\left( {{n_2}C_2^2} \right)}^{1/2}}}}{{{n_2}}} + \frac{{{{\left( {{n_3}C_3^2} \right)}^{1/2}}}}{{{n_3}}} + \ldots$

D

${\left[ {\frac{{{{\left( {{n_1}{C_1} + {n_2}{C_2} + {n_3}{C_3} + \ldots } \right)}^2}}}{{\left( {{n_1} + {n_2} + {n_3} + \ldots } \right)}}} \right]^{1/2}}$

Question Tags

📚 Subject:Chemistry

📑 Chapter:States Of Matter

🎯Topic:Molecular Velocities

🎓 Ncert Level:Understanding

🎯Difficulty :Easy

⚡ Time Required :2 mins

🔄Ncert Concepts :root mean square speed, statistical average

A gas deviates from ideal behaviour at a high pressure because its molecules

A

Attract one another

B

Show the Tyndall effect

C

Have kinetic energy

D

Are bound by covalent bonds

Question Tags

📚 Subject:Chemistry

📑 Chapter:States Of Matter

🎯Topic:Molecular Velocities

🎓 Ncert Level:Understanding

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :Ideal gas law, intermolecular forces, deviations from ideality

Average speed of the molecules of a gas in a container moving in one direction is:

A

$\sqrt {\frac{{8RT}}{{\pi M}}}$

B

$\sqrt {\frac{{3RT}}{M}}$

C

$\sqrt {\frac{{2RT}}{M}}$

D

Zero

Question Tags

📚 Subject:Chemistry

📑 Chapter:States Of Matter

🎯Topic:Molecular Velocities

🎓 Ncert Level:Understanding

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :kinetic theory of gases, average velocity, random motion

A mixture of two gases, A (molar mass $M_A$ ) and B (molar mass $M_B$ ), is at a constant temperature T. If the ratio of their most probable speeds is 2:1, what is the ratio of their molar masses?

A

$M_A : M_B = 1:4$

B

$M_A : M_B = 4:1$

C

$M_A : M_B = 1:2$

D

$M_A : M_B = 2:1$

Question Tags

📚 Subject:Chemistry

📑 Chapter:States Of Matter

🎯Topic:Molecular Velocities

🎓 Ncert Level:Application

🎯Difficulty :Hard

⚡ Time Required :2 mins

🔄Ncert Concepts :Kinetic Theory of Gases, Molecular Velocities, Most Probable Speed

The rms speed of hydrogen is $\sqrt 7$ times the rms speed of nitrogen. If $T$ is the temperature of the gas, then

A

${T_{{H_2}}} = {T_{{N_2}}}$

B

${T_{{H_2}}} > {T_{{N_2}}}$

C

${T_{{H_2}}} < {T_{{N_2}}}$

D

${T_{{H_2}}} = \sqrt {7{T_{{N_2}}}}$

Question Tags

📚 Subject:Chemistry

📑 Chapter:States Of Matter

🎯Topic:Molecular Velocities

🎓 Ncert Level:Analyzing

🎯Difficulty :Medium

⚡ Time Required :3 mins

🔄Ncert Concepts :root mean square speed, kinetic theory of gases, temperature

The absolute temperature of a gas is increased 3 times. The root mean square speed of the molecules will be:

A

3 times

B

9 times

C

$1/3$ times

D

$\sqrt 3 \,\,times$

Question Tags

📚 Subject:Chemistry

📑 Chapter:States Of Matter

🎯Topic:Molecular Velocities

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :root mean square speed, temperature, kinetic theory of gases

Two identical containers hold equal moles of two different ideal gases, A and B, at the same temperature. The molecular mass of gas A is twice that of gas B. What is the ratio of the average kinetic energy of the molecules of gas A to gas B?

A

1:1

B

2:1

C

1:2

D

4:1

Question Tags

📚 Subject:Chemistry

📑 Chapter:States Of Matter

🎯Topic:Molecular Velocities

🎓 Ncert Level:Understanding

🎯Difficulty :Hard

⚡ Time Required :1 mins

🔄Ncert Concepts :Kinetic Theory of Gases, Average Kinetic Energy

The average speed of an ideal gas molecule at ${27^0}C$ is $0.3{\rm{m}}{\sec ^{ - 1}}$ . The average speed at ${\rm{9}}{27^0}C$ will be ${\rm{m}}{\sec ^{ - 1}}$

A

$0.6$

B

$0.3$

C

$0.9$

D

$3.0$

Question Tags

📚 Subject:Chemistry

📑 Chapter:States Of Matter

🎯Topic:Molecular Velocities

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :Kinetic Theory of Gases, Root Mean Square Speed, Temperature Conversion

At room temperature the rms speed of the molecules of a certain diatomic gas is found to be $1930{\rm{m}}/{\rm{s}}$ . The gas is

A

${{\rm{H}}_2}$

B

${{\rm{F}}_2}$

C

${{\rm{O}}_2}$

D

${\rm{C}}{{\rm{l}}_2}$

Question Tags

📚 Subject:Chemistry

📑 Chapter:States Of Matter

🎯Topic:Molecular Velocities

🎓 Ncert Level:Application

🎯Difficulty :Medium

⚡ Time Required :2 mins

🔄Ncert Concepts :root mean square speed, kinetic theory of gases, molar mass

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