Question # 1

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.

Weak intermolecular forces are present in.

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Only gases

Only liquid

Only solids

gases, liquids and solids

Borax has the chemical formula.

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KNO3

Na2B3O7.10H2O

Na2CO3

NaNO3

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

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Clausius

Mexwell

Boltzmann

Vander waal

At which distance a molecule is present from its neighbor molecules of its own diameter, at room temperature.

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100 times

200 times

300 times

400 times

The rate of diffusion of a gas is

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Directly proportional to its density

Directly proportional to molecular mass

Inversely proportional to its density

Inversely proportional to square root of its molecular mass

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

More ideal gas at room temperature is.

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CO2

NH3

SO2

N2

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

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

A real gas obeying Van der Waal's equation will resemble ideal gas if.

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Both a and b are large

Both a and b are small or zero

A is small and b is large

A is large and b is small

At constant temperature in a given mass of and ideal gas.

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The ratio of pressure and volume remains constant

Volume always remains constant

Pressure always remains constant

The product of pressure and volume remains constant

The Van der Waals' equation explain the behaviour of.

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Ideal gas

Real gas

Vapours

Non ideal gases

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

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

Under which conditions of temperature and pressure will a real gas behave most like an ideal gas.

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Low temperature and how pressure

High temperature and high pressure

Low temperature and high pressure

High temperature and low pressure

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

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Effusion

Diffusion

Osmosis

Evaporation

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