Question # 1

the order of the rate of diffusion of gases NH₃, SO₂, CI₂and CO₂is

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NH₃> SO₂>CI₂CO₂

NH₃> CO₂> SO₂> CI₂

CI₂> SO₂> CO₂> NH₃

NH₃> CO₂> CI₂> 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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Noon has low critical temperature and pressure as compared to other gases. the most probable reason is that

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Its octet is complete

It is a monoatomic gas

It has very low polarizability

It has least forces of attraction

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

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 Van der Waals' equation explain the behaviour of.

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Ideal gas

Real gas

Vapours

Non ideal gases

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

Weak intermolecular forces are present in.

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Only gases

Only liquid

Only solids

gases, liquids and solids

Density of a gas is usually expressed in

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kg m-3

kg dm-3

g dm-3

g cm-3

Gas molecules show more deviation from ideal behaviour at high pressure because.

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Velocity of molecules increases

Velocity of molecules decreases

Force of attraction between molecules increases

Force of collision per unit area increases

For a gas obeying Boyle's law if pressure is doubled, the volume becomes.

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Double

One half

Four times

Remains constant

How should the condition be changed to prevent the volume of a given gas from expanding when its mass is increased

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Temperature is lowered and pressure is increased

Temperature is increase and pressure is lowered

Temperature and pressure both are lowered

Temperature and pressure both are increased

The molar volume of CO₂is maximum at

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STP (0°C and 1 atm)

127° C and 1 atm

0°C and 2 atm

273°C and 2 atm

Vapour pressure of liquid depends upon

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Amount of liquid

Surface area

Temperature

Size of container

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 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

If we plot a graph between I/V at x-axis and pressure at Y -axis

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a parabolic graph is obtained

By increasing temperature straight line move toward x axis

By increases temperature straight line move toward y axis.

No. change in line by increasing temperature.

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

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