Question # 1

Which one of the following expressions is for ideal gas equation.

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PM= nRT

PV = nRT

PV = dRT

PV= nTP

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

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Remain unchanged

Increase four times

Reduce to 1/4

Be doubled

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

Pressure remaining constant at which temperature the volume of a gas will become twice of what it is at 0° C

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546°C

200°C

546 K

273 K

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

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

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

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 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

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

The volume of a gas at 0 oC is 273 dm3, the pressure remaining constant. At which temperature its volume will be doubled.

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273 K

273 ^oC

546 ^oC

316 K

Which mixture of gases is used by the deep sea divers.

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Oxygen and nitrogen

Oxygen and helium

Oxygen and carbon di oxide

Oxygen and water vapours

The diffusion of gases at absolute zero will be

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Unchanged

Zero

slightly decreases

Slightly increases

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

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 number of molecules in one dm³of water is close to

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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

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