A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 3 7 . 0 ∘ C . As it does so, it absorbs 208 J of heat. The values of q and w for the process will be (R = 8.314 J/mol K) (ln7.5 = 2.01)

q = + 2 0 8 J , w ⁡ = - 2 0 8 J

q = + 2 0 8 J , w ⁡ = + 2 0 8 J

q = - 2 0 8 J , w ⁡ = - 2 0 8 J

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Which one of the following sets of phenomena would increase on raising the temperature?

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Important Questions on Matter in our Surroundings

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Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of

37 . 0^{\circ} C

. As it does so, it absorbs 208 J of heat. The values of q and w for the process will be
(R = 8.314 J/mol K) (ln7.5 = 2.01)

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Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

The combination of plots which does not represent isothermal expansion of an ideal gas is

$(A)$ Question Image

$(B)$

$(C)$

$(D)$

HARD

Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

The above

P - V

diagram represents the thermodynamic cycle of an engine, operating with an ideal mono-atomic gas. The amount of heat, extracted from the source in a single cycle, is:

EASY

Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

Calculate the work done during compression of

2

mol of an ideal gas from a volume of

1 m^{3}

10

{dm}^{3}

300 K

against a pressure of

100 kPa

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Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

Among copper, invar and iron the linear expansion coefficient of iron is the lowest.

EASY

Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

The work done during combustion of

9 \times 10^{- 2}

kg

of ethane,

C_{2} H_{6} (g)

300 K

is (Given

R = 8 .314 {JK}^{- 1} {mol}^{- 1}

, atomic mass

C = 12, H = 1

)

HARD

Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

A reversible cyclic process for an ideal gas is shown below. Here,

P, V, a n d T

are pressure, volume and temperature, respectively. The thermodynamic parameters

q, w, H a n d U

are heat, work, enthalpy and internal energy, respectively.

Question Image

The correct option(s) is (are)

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Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

For the isothermal reversible expansion of an ideal gas

EASY

Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

A piece of ice falls from a height

h

so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of

h

is:
(Latent heat of ice is

3.4 \times 10^{5} {J kg}^{- 1}

and

g = 10 {N kg}^{- 1}

)

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The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of KCl,

C H_{3} O H

and

C H_{3} {(C H_{2})}_{11} O S O_{3}^{-} N a^{+}

at room temperature. The correct assignment of the sketches is -

Question Image

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Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

X g

of ice at

0^{o} C

is added to 340g of water at

20^{o} C

. The final temperature of the resultant mixture is

5^{o} C

. The value of

X

(in g) is closest to

[Heat of fusion of ice

= 333 J / g

; Specific heat of water

= 4.184 J / g . K

]

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Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

Which of the following statements are true?

I. On heating the kinetic energy of particles in solids does not change because they have a fixed position.

II. Sublimation is the change of gaseous state directly to solid state without going through liquid state and vice versa.

III. The movement of particles from an area of higher concentration to lower concentration is called diffusion.

IV. The rate of evaporation is not affected by increasing the temperature.

EASY

Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

An ideal gas undergoes isothermal expansion at constant pressure. During the process:

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Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

A system consisting of 1 mol of an ideal gas undergoes a reversible process,

A \to B \to C \to A

(schematically indicated in the figure below). If the temperature at the starting point A is 300 K and the work done in the process

B \to C

is 1 L atm, the heat exchanged in the entire process in L atm is

Question Image

EASY

Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

A gas undergoes change from state

A

to state

B

. In this process, the heat absorbed and work done by the gas is

5 J and 8 J

, respectively. Now gas is brought back to

A

by another process during which

3 J

of heat is evolved. In this reverse process of

B to A

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Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

The volume vs. temperature graph of 1 mole of an ideal gas is given below

Question Image

The pressure of the gas (in atm) at

X, Y

and

Z,

respectively, are

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Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

A gas is allowed to expand in a well-insulated container against a constant external pressure of

2.5 atm

from an initial volume of

2.50 L

to a final volume of

4.50 L .

The change in internal energy

ΔU

of the gas in joules will be

HARD

Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

An ideal gas undergoes isothermal compression from

5 m^{3}

1 m^{3}

against a constant external pressure of

4 N m^{- 2}

. The heat released in this process is

24 J {mol}^{- 1} K^{- 1}

and is used to increase the pressure of

1

mole of

Al

. The temperature of

Al

increases by:

EASY

Science>Chemistry>Matter in our Surroundings>Characteristics of Particles of Matter

What is called Brownian movement?

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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-

Which one of the following sets of phenomena would increase on raising the temperature?

Important Questions on Matter in our Surroundings

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