11th Chemistry Weekly Test - 1 ( Gaseous State )

MABS Institution

11th Chemistry Weekly Test - 1 ( Gaseous State )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The absolute zero is _____________

-273^oC
273^oC
OK
both a and c

The hydrogen balloon was invented by ______________

Robert Boyle
J.A.C. Charles
Maxwell
Gay Lussac

Vanderwaal's constant a and b are related with ______________ respectively

attractive force and volume of molecules.
repulsive force and volume of molecules
attractive force and bond energy of molecules.
shape and repulsive force of molecules

Use of hot air balloon in sports at meteorological observation is an application of

Boyle's law
Newton's law
Kelvin's law
Brown's law

The units of Vander Waals constants 'b' and 'a' respectively

mol L^-1 and L atm² mol^-1
mol L and L atm mol²
mol^-1L and L² atm mol^-2
none of these

Identify the correct mathematical expression of Graham's law of diffusion.

\(\frac { { r }_{ 2 } }{ { r }_{ 1 } } =\sqrt { \frac { { M }_{ 2 } }{ { M }_{ 1 } } } \)
\({ r }_{ 1 }r_{ 2 }=\sqrt { \frac { { M }_{ 2 } }{ { M }_{ 1 } } } \)
\(\frac { { r }_{ 1 } }{ { r }_{ 2 } } =\sqrt { \frac { { M }_{ 2 } }{ { M }_{ 1 } } } \)
\(\frac { { r }_{ 1 } }{ { r }_{ 2 } } ={ \left[ \frac { { M }_{ 2 } }{ { M }_{ 1 } } \right] }^{ 2 }\)

Four gases P, Q, R and S have almost same values of 'b' but their 'a' values (a, b are Vander Waals Constants) are in the order Q < R < S < P. At a particular temperature, among the four gases the most easily liquefiable one is

The standard atmospheric pressure is the pressure that supports a column of mercury exactly ___________ high at 0° C at sea level.

760mm
76 cm
both a & b
760 cm

If a gas expands at constant temperature, it indicates that

no. of molecules of gas increases
kinetic energy of molecules decreases.
pressure of the gas increases.
kinetic energy of molecules remains the same.

The molecules of a gas A travel four times faster than the molecules of gas B at same temperature. The ratio of molecular weight M_A / M_B is _________.

1/16
4
1/4
16

Part - B

Generic 2 - Answer All Question

Distinguish between a gas and a vapour.

(i) Define critical pressure.
(ii) What is the critical pressure of CO₂ gas?

State charles law and give an example.
Imagine the molecular collisions to the gases were inelastic. What would have happened?

Mention the postulates of kinetic theory of gases which do not explain the behaviour of real gases.

Part - C

Generic 3 - Answer All Question

Explain the graphical representation of Avogadro's hypothesis.

What is inversion temperature? How is it related to Vander Waals constants?

When the driver of an automobile applies brake, the passengers are pushed toward the front of the car but a helium balloon is pushed toward back of the car. Upon forward acceleration the passengers are pushed toward the front of the car. Why?
In the below figure, let us find the missmg parameters [volume in (b) and temperature in (c)]
P_I = 1 atm, P₂ = 1 atm, P₃ = 1 atm
V₁ = 0.3 dm³, V₂ = ? dm³, V₃ = 0.15 dm³
T₁ = 200 K, T₂ = 300 K, T₃ = ? K.

A combustible gas is stored in a metal tank at a pressure of 2.98 atm at 25°C. The tank can withstand a maximum pressure of 12 atm after which it will explode. The building in which the tank has been stored catches fire. Now predict whether the tank will blow up first or start melting? (Melting point of the metal = 1100 K).

Part - D

Generic 5 - Answer All Question

What are the observations that you get from the plot of Z vs P. (PV / RT vs P) for real gases?

If a gas diffuses at the rate of one-half as fast as O₂, find the molecular mass of the gas.

Vanderwaal's constant for a gas (g) are a = 6.34 atm lit^-2; and b = 52.6 ml mol^-1. Find the critical temperature and critical pressure of the gas.

A flammable hydrocarbon gas of particular volume is found to diffuse through a small hole in 1.5 minutes. Under the same conditions of temperature and pressure an equal volume of bromine vapour takes 4.73 min to diffuse through the same hole. Calculate the molar mass of the unknown gas and suggest what this gas might be, (Given that molar mass of bromine = 159.8 g/mole
In an experimant of verification of Charle's law, the following are the set of readings taken by a student

Experiment Volume (L) Temperature (°C)

1 1.54 20

2 1.65 40

3 1.95 100

4 2.07 120

What is the average value of the constant of proportionality?

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Experiment	Volume (L)	Temperature (°C)
1	1.54	20
2	1.65	40
3	1.95	100
4	2.07	120

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11th Chemistry Weekly Test - 1 ( Gaseous State )

MABS Institution

11th Chemistry Weekly Test - 1 ( Gaseous State )-Aug 2020

Part - A

Multiple Choice Question - Answer All Question

The absolute zero is _____________

The hydrogen balloon was invented by ______________

Vanderwaal's constant a and b are related with ______________ respectively

Use of hot air balloon in sports at meteorological observation is an application of

The units of Vander Waals constants 'b' and 'a' respectively

Identify the correct mathematical expression of Graham's law of diffusion.

Four gases P, Q, R and S have almost same values of 'b' but their 'a' values (a, b are Vander Waals Constants) are in the order Q < R < S < P. At a particular temperature, among the four gases the most easily liquefiable one is

The standard atmospheric pressure is the pressure that supports a column of mercury exactly ___________ high at 0° C at sea level.

If a gas expands at constant temperature, it indicates that

The molecules of a gas A travel four times faster than the molecules of gas B at same temperature. The ratio of molecular weight MA / MB is _________.

Part - B

Generic 2 - Answer All Question

Distinguish between a gas and a vapour.

(i) Define critical pressure. (ii) What is the critical pressure of CO2 gas?

State charles law and give an example.

Imagine the molecular collisions to the gases were inelastic. What would have happened?

Mention the postulates of kinetic theory of gases which do not explain the behaviour of real gases.

Part - C

Generic 3 - Answer All Question

Explain the graphical representation of Avogadro's hypothesis.

What is inversion temperature? How is it related to Vander Waals constants?

When the driver of an automobile applies brake, the passengers are pushed toward the front of the car but a helium balloon is pushed toward back of the car. Upon forward acceleration the passengers are pushed toward the front of the car. Why?

In the below figure, let us find the missmg parameters [volume in (b) and temperature in (c)] PI = 1 atm, P2 = 1 atm, P3 = 1 atm V1 = 0.3 dm3, V2 = ? dm3, V3 = 0.15 dm3 T1 = 200 K, T2 = 300 K, T3 = ? K.

Part - D

Generic 5 - Answer All Question

What are the observations that you get from the plot of Z vs P. (PV / RT vs P) for real gases?

If a gas diffuses at the rate of one-half as fast as O2, find the molecular mass of the gas.

Vanderwaal's constant for a gas (g) are a = 6.34 atm lit-2; and b = 52.6 ml mol-1. Find the critical temperature and critical pressure of the gas.

In an experimant of verification of Charle's law, the following are the set of readings taken by a student Experiment Volume (L) Temperature (°C) 1 1.54 20 2 1.65 40 3 1.95 100 4 2.07 120 What is the average value of the constant of proportionality?

Comment

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The molecules of a gas A travel four times faster than the molecules of gas B at same temperature. The ratio of molecular weight M_A / M_B is _________.

(i) Define critical pressure.
(ii) What is the critical pressure of CO₂ gas?

In the below figure, let us find the missmg parameters [volume in (b) and temperature in (c)]
P_I = 1 atm, P₂ = 1 atm, P₃ = 1 atm
V₁ = 0.3 dm³, V₂ = ? dm³, V₃ = 0.15 dm³
T₁ = 200 K, T₂ = 300 K, T₃ = ? K.

If a gas diffuses at the rate of one-half as fast as O₂, find the molecular mass of the gas.

Vanderwaal's constant for a gas (g) are a = 6.34 atm lit^-2; and b = 52.6 ml mol^-1. Find the critical temperature and critical pressure of the gas.

In an experimant of verification of Charle's law, the following are the set of readings taken by a student

Experiment Volume (L) Temperature (°C)

1 1.54 20

2 1.65 40

3 1.95 100

4 2.07 120

What is the average value of the constant of proportionality?