Question # 1

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

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

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Water vapours

NH3

Nitrogen

H2

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

Which is not example of natural plasma.

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Lightening bolt

Aurora

Neon sign

Sum

Borax has the chemical formula.

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KNO3

Na2B3O7.10H2O

Na2CO3

NaNO3

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

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

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

Density of a gas is usually expressed in

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kg m-3

kg dm-3

g dm-3

g cm-3

Weak intermolecular forces are present in.

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Only gases

Only liquid

Only solids

gases, liquids and solids

What are the SI units of Van der Waal constant 'a'

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atm dm3 mol-2

atm dm6 mol-2

Nm4 mol-2

Nm mol-1

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

Observed pressure is less than ideal pressure for any gas due to

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Intermolecular forces

Size of molecules

Boiling point of molecules

Both a and c

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 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

The temperature of natural plasma is about.

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200000 ^oC

10000^oC

5000^oC

1000^oC

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

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

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