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A block of ice at $- 10 ° C$ slowly heated and converted to steam at $100 ° C$ . Which of the following curves represents this phenomenon qualitatively?

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Important Questions on Some Basic Concepts of Chemistry

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

The rate of diffusion of methane at a given temperature is twice that of gas

X

. The molecular weight of gas

X

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

What is the kinetic energy (in

ergs

) of the nitrogen molecule at

- 73 ° C

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

The volume

V

of an enclosure contains a mixture of three gases,

16 g

of oxygen,

28 g

of nitrogen and

44 g

of carbon dioxide at absolute temperature

T

. Consider

R

as universal gas constant. The pressure of the mixture of gases is :

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

Two gases

A

and

B

are released from the two ends of a tunnel of length

100 m

. A travels

40 \min

, before meeting the gas

B

in the tunnel. If the molecular weight of

B

18

, what is the molecular weight of

A

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

The change in the magnitude of the volume of an ideal gas when a small additional pressure

∆ P

is applied at a constant temperature, is the same as the change when the temperature is reduced by a small quantity

∆ T

at constant pressure. The initial temperature and pressure of the gas were

300 K

and

2 atm

respectively. If

| ΔT | = C | ΔP |

then value of

C

(K / atm)

is __________

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

1 L

each of gases

A

and

B

diffused through a membrane in

15

and

30

minutes, respectively, under identical conditions. What is the ratio of molecular weight of

A

and

B ?

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

Benzene and toluene form an ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at $T (K)$ are $50 mmHg$ and $40 mmHg$ , respectively. What is the mole fraction of toluene in vapour phase when $117 g$ of benzene is mixed with $46 g$ of toluene?

(Molar mass of benzene and toluene are $78$ and $92 g {mol}^{- 1}$ , respectively)

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

The speed of the gas molecules contained in a closed vessel at fixed temperature and pressure is the same.

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

Diffusion of

{CH}_{4} (g)

and

O_{2} (g)

occurs under similar conditions, then the ratio of their rates of diffusion is

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

The kinetic energy in

J

1

mole of

N_{2}

27 ° C

is:

(R = 8.314 J {mol}^{- 1} K^{- 1})

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

The ratio of rates of diffusion of oxygen and an unknown gas is

1 : 4

. The unknown gas is

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

A gas molecule of mass

M

at the surface of the earth has kinetic energy equivalent to

0 ° C

. If it were to go up straight without colliding with any other molecules, how high would it rise? Assume that the height attained is much less than the radius of the earth. (

k_{B}

is Boltzmann constant)

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

How many times the volume of a diatomic gas should be increased reversibly and adiabatically in order to reduce its RMS velocity to half of its intial value.

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

A cylindrical container of volume

4.0 \times 10^{- 3} m^{3}

contains one mole of hydrogen and two moles of carbon dioxide. Assume the temperature of the mixture is

400 K

. The pressure of the mixture of gases is :
[Take gas constant as

8.3 J {mol}^{- 1} K^{- 1}]

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

Select from the box, the correct gas law related to the given situation.

Boyle's law, Charles law, Avagadro's law

An inflated balloon kept at sunlight bursts after some time.

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

Urea is produced by metabolism of _____.

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

A bottle of ammonia and a bottle of dry hydrogen chloride connected through a long tube are opened simultaneously at both ends. The white ammonium-chloride ring first formed will be-

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

10

litre cylinder contains equal volumes of

H_{2}

and

He

. If the mixture is allowed to diffuse from an opening, estimate the percent composition of the output gas. (Assume ideal behaviour of gas mixture)

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

Which of the following statement(s) (are) correct regarding the root-mean-square speed

(U_{r m s})

and average translational kinetic energy

(E_{av})

of a molecule in a gas at equilibrium?

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Nature of Matter

Which of the following is not an assumption of the kinetic theory of gases?

A block of ice at -10°C slowly heated and converted to steam at 100°C. Which of the following curves represents this phenomenon qualitatively?

Important Questions on Some Basic Concepts of Chemistry

Learn and Prepare for any exam you want !

A block of ice at $- 10 ° C$ slowly heated and converted to steam at $100 ° C$ . Which of the following curves represents this phenomenon qualitatively?