Question # 1

How should the conditions be changed to prevent the volume of a give gas from expanding when its mass is increased.

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Temperature is lowered and pressure is increased.

Temperature is increased and pressure is lowered

Temperature and pressure both are lowered

Temperature and pressure both are increased

The concept of distribution of velocities among the gas molecules was given by.

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Clausius

Mexwell

Boltzmann

Vander waal

Pressure remaining constant, at which temperature the volume of a gas will become twice of what it is at 0 ^oC

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546 ^oC

200 ^oC

546 K

273 K

Equal masses of methane and oxygen are mixed in an empty container at 25°C, the fraction of total pressure exerted by oxygen is

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1/3

8/9

1/9

16/17

Which one of the following gases diffuse more rapidly.

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Cl2

CO2

CH4

N2

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

Which of the following will have highest rate of diffusion

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O2

CO2

NH3

SO2

In gas occupies a volume of 2 dm³at 27°C and I atm pressure. The expression for its volume at S.T.P. is

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If temperature of one mole of ideal gas at 273 K and one atmospheric pressure is increased by 1 K, amount of energy absorbed is.

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0.082 dm3 atm

1.987 cal.

8.313 J

All are correct.

A gas is heated in such a way that its volume and absolute temperature both are doubled. the pressure of the gas

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Becomes 2 times

Becomes 4 times

Become half

Remain same

The molar volume of CO2 is maximum at.

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STP

127 ^oC and 1 atm

0 ^oC and 2 atm

273 ^oC and 2 atm

The spreading of fragrance of a rose or scent in air is due to.

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Effusion

Diffusion

Osmosis

Evaporation

If absolute temperature of the gas is doubled and the pressure is reduced to one half the volume the gas will.

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Remains uncharged

Increase four time

Reduce to 1/4

Be doubled

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

The diffusion of gases at absolute zero will be

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Unchanged

Zero

slightly decreases

Slightly increases

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

The partial pressure of oxygen in lungs is

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760 torr

320 torr

159 torr

116 torr

The order of the rate of diffusion of gases NH3, SO3, Cl2 and CO2 is.

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NH3>SO2>CL2>CO2

NH3>CO2>SI2>Cl2

Cl2>SO2>CO2>NH3

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