Question # 1

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

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.

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

Borax has the chemical formula.

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KNO3

Na2B3O7.10H2O

Na2CO3

NaNO3

Rate of diffusion of CO and N₂are same at room temperature due to the reason, that

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Both are diatomic molecules

Both have same multiple bond in them

Both have lone pairs in them

Both have same molar masses

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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Which of the following will have the same number of molecules at STP

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280 cm³of CO₂and 280 cm³of N₂O

11.2 dm³of O₂and 32 g of O₂

44 g of CO₂and 11.2 dm³of CO

28 g of N₂and 5.6 dm³of oxygen

Mass of 22.4 dm3 of N2 at STP is.

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28 gm

14 gm

1.4 gm

2,8 gm

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 number of molecules in one dm³of water is close to

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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 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

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

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

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

Gas equation is derived by combining

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Avogadro's and Charles's Law

Boyle's and Charles's Law

Avogadro's and Boyle's Law

Avogadro's, Boyle's and Charles's Law

How should the conditions be changed to prevent the volume of a give gas from expanding when its mass is increased.

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Temperature is lowered and pressure is increased.

Temperature is increased and pressure is lowered

Temperature and pressure both are lowered

Temperature and pressure both are increased

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