EASY

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The first reliable measurement on the properties of gases was made by scientist _____.

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Important Questions on States of Matter

MEDIUM

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

Assuming ideal gas behavior, the ratio of density of ammonia to that of hydrogen chloride at same temperature and pressure is: (Atomic weight of Cl is 35.5 u)

EASY

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

For the given $pV$ isotherms, which of the following is correct for $T_{1}, T_{2}, T_{3} ?$

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MEDIUM

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

An open vessel at

27^{o} C

is heated until two fifth of the air (assumed as an ideal gas) in it has escaped from the vessel. Assuming that the volume of the vessel remains constant, the temperature to which the vessel has been heated is:

EASY

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

10 moles of a mixture of hydrogen and oxygen gases at a pressure of 1 atm at a constant volume and temperature, react to form 3.6 g of liquid water. The pressure of the resulting mixture will be closest to:

EASY

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

Which of the following equations does NOT represent Charles’s law for a given mass of gas at constant pressure?

EASY

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

An ideal gas has pressure

P

, volume

V

and absolute temperature

T

. If

m

is the mass of each molecule and

K

is the Boltzmann constant then density of the gas is

MEDIUM

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

The volume of gas $A$ is twice than that of gas $B$ . The compressibility factor of gas $A$ is thrice than that of gas $B$ at same temperature. What are the pressures of the gases for equal number of moles?

MEDIUM

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

The density of acetic acid vapour at

300 K

and

1 atm

5 mg {cm}^{- 3}

. The number of acetic acid molecules in the cluster that is formed in the gas phase is closest to

EASY

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

10 g

of a gas at

STP

occupies a volume of

2 L

. At what temperature will the volume be doubled, if pressure and amount of the gas remains constant?

MEDIUM

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

A certain sample of gas has a volume of

0.2 L

at one atmosphere pressure and

273.15 K

. What is the volume of gas at

273.15 ° C

at same pressure ?

MEDIUM

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

At a constant pressure P, the plot of volume (V) as a function of temperature (T) for 2 moles of an ideal gas gives a straight line with a slope

0.328 L . K^{- 1}

. The value of P (in atm) is closest to

[Gas constant,

R = 0.0821 L a t m m o l^{- 1} K^{- 1}

]

EASY

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

Equal masses of

H_{2}, O_{2}

and methane have been taken in a container of volume

V

at temperature

27^{o} C

in identical conditions. The ratio of the volumes of gases

H_{2} : O_{2} :

methane would be

EASY

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

In a closed vessel, an ideal gas at

1 atm

is heated from

27^{o} C to 327^{o} C

, the final pressure of the gas will approximately be

EASY

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

At constant pressure, the volume of a fixed mass of a gas varies as a function on temperature as shown in the graph

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The volume of the gas at $300 ° C$ is larger than that at $0 ° C$ by a factor of

EASY

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

300 K

, the density of a certain gaseous molecule at

2

bar is double to that of dinitrogen

(N_{2})

4

bar. The molar mass of the gaseous molecule is

EASY

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

The value of 1 mole of any pure ideal gas at standard temperature and pressure is always equal to

HARD

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

Two closed bulbs of equal volume

(V)

containing an ideal gas initially at pressure

p_{i}

and temperature

T_{1}

are connected through a narrow tube of negligible volume, as shown in the figure below. The temperature of one of the bulbs is then raised to

T_{2} .

The final pressure

P_{f}

is:

MEDIUM

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

The temperature to which the open vessel at

27 ° C

is to be heated to expel

3 / 5

of the air in it is (Assume (i) volume of the vessel remains constant and (ii) ideal behaviour for all gases present in air)

MEDIUM

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

A mixture of gases

O_{2}, H_{2}

and

C O

are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is:

EASY

Chemistry>Physical Chemistry>States of Matter>The Gas Laws

Modern vacuum pumps can evacuate a vessel down to a pressure of

4.0 \times 1 0^{- 15}

atm. at room temperature (300 K). Taking R = 8.3 JK^-1 mole^-1, 1 atm = 10⁵ Pa and

N_{Avogadro} = 6 \times 1 0^{23} {mole}^{- 1}

, the mean distance between molecules of gas in an evacuated vessel will be of the order of :

The first reliable measurement on the properties of gases was made by scientist _____.

Important Questions on States of Matter

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