Question # 1

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

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

The temperature of natural plasma is about.

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200000 ^oC

10000^oC

5000^oC

1000^oC

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

Total pressure of mixture of two gases is.

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The sum of their partial pressures.

The difference of their partial pressures

The product of their practical pressures

The ratio of their partial pressures

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 of the following will have the same number of molecule at STP.

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280 cm3 CO2 and 280 cm3 of N2O

11.2 dm3 of O2 and 32 g of O2

44 g of CO2 and 11.2 dm3 of CO

28 g of N2 and 5.6 dm3 of oxygen

An Ideal gas can not be liquefied because.

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Its critical temperature is always above 0 ^oC

It molecules are relatively smaller in size

Its solidify before becoming a liquid

Force operative between its molecules are negligible

A real gas can be liquefied if.

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Temperature is more than critical temperature.

Temperature is less than critical temperature

Pressure is more than critical pressure and temperature is less than critical temperature

Its pressure is less than critical pressure

The deviation of a gas from ideal behaviour is maximum at.

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-10 ^oC and 5.0 atm

-10 ^oC and 2.0 atm

100 ^oC and 2.0 atm

0 ^oC and 2.0 atm

Mass of 22.4 dm3 of N2 at STP is.

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28 gm

14 gm

1.4 gm

2,8 gm

If the number of gas molecules are doubled in a certain volume of a gas, the pressure is.

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Decreased to half

Doubled

Increased to four time

Remains unchanged

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

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

The rate of diffusion of a gas of molar mass 72 as compared to H2 will be.

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1/6 times

1.4 times

6 times

same

Partial pressure of oxygen in the air is.

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156 torr

157 torr

158 torr

159 torr

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

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

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