Question # 1

Feeling uncomfortable breathing in un pressurized cabins is due to

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High pressure of CO2

Fatigue

Low pressure of O2

Low presssure of CO2

The diffusion of gases at absolute zero will be

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Unchanged

Zero

slightly decreases

Slightly increases

At which distance a molecule is present from its neighbor molecules of its own diameter, at room temperature.

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100 times

200 times

300 times

400 times

The number of molecules in one dm³of water is close to

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Normal temperature and pressure (S.T.P) of gas rafers to

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273 K and 76 mm Hg

273° C and 760 mm Hg

273 K and 760 mm Hg

273° C and 76 mm Hg

Gases of air, always remains in the random motion and do not settle due to.

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Elastic collision of gas molecules

Unequal number of different gas molecules

Difference impartial pressure of gas molecules

Difference in molecular masses of air gases

Keeping the temperature constant of the gas is expanded.

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Pressure will decrease

Temperature will increase

Kinetic energy of molecules will increase

No. of gas molecules increases

Gases exert pressure on the walls of the container becasue the gas molecules.

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Collide with each other

Collide with walls of container

Have definite volume

Obey the gas laws

The highest temperature above which a gas cannot be liquified, no matter how much the pressure is applied is known as

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Boiling temperature

Consulate temperature

Absolute zero

Critical temperature

Which one of the following gases diffuse more rapidly.

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Cl2

CO2

CH4

N2

How many balloon of 0.25 dm3 capacity at 1 atmospheric pressure can be filled from a hydrogen gas cylinder of 5 dm3 capacity at 10 atmospheric pressure.

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50

90

180

200

If 2 mol of an ideal gas at 546 K occupy a volume of 44.8 dm3, the pressure must be.

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1 atm

2 atm

3 atm

4 atm

Density of a gas is usually expressed in

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kg m-3

kg dm-3

g dm-3

g cm-3

The real gas obeying Van der Waal's equation will resemble ideal gas is.

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both 'a' and 'b' are large

both 'a' and 'b' and small

'a' is small and 'b' is large

'a' is large and 'b' is small

Under which conditions of temperature and pressure will a real gas behave most like an ideal gas.

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Low temperature and how pressure

High temperature and high pressure

Low temperature and high pressure

High temperature and low pressure

Which one of the following gases cannot be liquefied by Line's method.

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Water vapours

NH3

Nitrogen

H2

Equal masses of methane and oxygen are mixed in an empty container at 25 ^oC. The fraction of total pressure exerted by oxygen is.

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1/3

8/9

1/9

16/17

What are the SI of excluded volume 'b' in Vander waal equation.

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dm³ mol -1

m3 mol -1

mol dm-3

mol m-3

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