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11th Chemistry Monthly Test - 1 ( Gaseous State )

MABS Institution

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

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The value of critical temperature of carbon dioxide is _________.

273 K
303.98 K
373 K
-80^o C

Rate of diffusion of a gas is

Directly proportional to its density
Directly proportional to its molecular weight
Directly proportional to its square root of its molecular weight
Inversely proportional to the square root of its molecular weight

The parameters that describe the gaseous state are _______________

volume
pressure
temperature
all of these

Passenger aeroplane cabins is artificially pressurised since

pressure decreases with the increase in altitude
pressure increases with the increase in altitude
temperature increases with the increase in altitude
none of the above

If the volume of a fixed mass of a gas is reduced to half at constant temperature, the gas pressure _____________

remains constant
doubles
reduces to half
becomes zero

The value of compression factor Z is equal to ____________.

\(\frac{nRT}{PV}\)
\(\frac{PV}{RT}\)
PV x nRT
\(\frac{PV}{nRT}\)

A person living in Shimla observed that cooking food with using pressure cooker takes more time. The reason for this observation is that at high altitude _____________.

pressure increases
temperature decreases
pressure decreases
temperature decreases

Compressibility factor for CO₂ at 400 K and 71.0 bar is 0.8697. The molar volume of CO₂ under these conditions is

22.04 dm³
2.24 dm³
0.41 dm³
19.5 dm³

The variation of volume V, with temperature T, keeping pressure constant is called the coefficient of thermal expansion ie \(\alpha =\frac { 1 }{ V } { \left( \frac { \partial V }{ \partial T } \right) }_{ P }\) . For an ideal gas a is equal to

T
1/T
P
none of these

The value of universal gas constant depends upon

Temperature of the gas
Volume of the gas
Number of moles of the gas
units of Pressure and volume.

Part - B

Generic 2 - Answer All Question

Name two items that can serve as a model for Gay Lusaac' law and explain.

State Dalton's law of partial pressure.

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

Define inversion temperature.
State charles law and give an example.

What are isobar and isochores?

Distinguish between diffusion and effusion.

State Dalton's law of partial pressure.

Under what conditions, do real gases behave ideally?

Explain Joule Thomson effect.

Part - C

Generic 3 - Answer All Question

A small bubble rises from the bottom of a lake where the temperature and pressure are 8°C and 6.4 atm. to the water surface, where the temperature is 25°C and pressure is 1atm. Calculate the final volume in (mL) of the bubble, if its initial volume is 2.1 mL.

Explain the graphical representation of Avogadro's hypothesis.

A mixture of gases contains 4.76 mole of Ne, 0.74 mole of Ar and 2.5 mole of Xe. Calculate the partial pressure of gases, if the total pressure is 2 atm. at a fixed temperature. Solve this problem using Dalton's law.

A sample of gas has a volume of 8.5 dm³ at an unknown temperature. When the sample is submerged in ice water at 0 °C, its volume gets reduced to 6.37 dm³. What is its initial temperature?

In the below figure, let us find the missing parameters [volume in (b) and pressure in (c)]
P₁ = 1 atm, P₂ = 2 atm, P₃ = ? atm
V₁ = 1dm³, V₂ =? dm³, V₃ = 0.25 dm³
T₁ = 298 K, T₂ = 298 K, T₃ = 298 K.
Sulphur hexafluoride is a colouriess, odourless gas; calculate the pressure exerted by 1.82 moles of the gas in a steel vessel of volume 5.43 dm³ at 69.5°C, assuming ideal gas behaviour.

Explain the graphical representation of Boyle's law.

Derive ideal gas equation.

Argon is an inert gas used in light bulbs to retard the vaporization of the tungsten filament. A certain light bulb containing argon at 1.2 atm and 18°C is heated to 85°C at constant volume. Calculate its final pressure in atm.

What is compressibility factor? How does it explain the deviation of non ideal gases from ideal behaviour.

Part - D

Generic 5 - Answer All Question

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

An athlete in a kinesiology research study has his lung volume of 7.05 dm³ during a deep inhalation. At this volume, the lungs contain 0.312 mole of air. During exhalation, the volume of his lung decreases to 2.35 dm³. How many moles of air does the athlete exhale during exhalation? (assume pressure and temperature remain constant).

Explain the following observations
(a) Aerated water bottles are kept under water during summer
(b) Liquid ammonia bottle is cooled before -opening the seal
(c) The tyre of an automobile is inflated to slightly lesser pressure in summer than in winter
(d) The size of a weather balloon becomes larger and larger as it ascends up into larger altitude

Vanderwaal's constant for gas are a = 3.67 atm lit²mol^-2 b = 0.0408 lit mol^-1. Find the critical temperature and critical pressure of the gas.

How will you calculate the partial pressure in terms of mole fraction?

Explain Andrew's isotherm of carbon dioxide.
Describe an experiment to verify Boyle's law.

At 27°C temperature and 4 bar pressure CO is filled in 2 litre vessel. Find the pressure if it is filled in 4 litre vessel at 77 °C temperature.

Find the moles of O₂ gas having pressure 250 bar in 500 ml vessel at 350 k temperature.

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