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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Ozone is an important constituent of the stratosphere as it blocks harmful UV rays from the Sun. Ozone has the chemical formula $O_{3}$ . Which word describes ozone?

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Important Questions on Nature and Behaviour of Matter

HARD

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

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)

MEDIUM

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

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

MEDIUM

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

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

$(A)$ Question Image

$(B)$

$(C)$

$(D)$

MEDIUM

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

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

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

One mole of an ideal monatomic gas is compressed isothermally in a rigid vessel to double its pressure at room temperature,

27^{o} C

. The magnitude of work done on the gas will be:

MEDIUM

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

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)

HARD

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

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

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

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

HARD

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

An ideal gas undergoes a cyclic process as shown in the figure
Question Image

∆ U_{BC} = - 5 {KJmol}^{- 1}, q_{AB} = 2 {KJmol}^{- 1}

W_{AB} = - 5 {KJmol}^{- 1}, W_{CA} = 3 {KJmol}^{- 1}

Heat absorbed by the system during process

CA

HARD

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

Consider the reversible isothermal expansion of an ideal gas in a closed system at two different temperatures

T_{1}

and

T_{2} (T_{1} < T_{2})

. The correct graphical depiction of the dependence of work done

(w)

vs the final volume

(V)

is:

EASY

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

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

)

MEDIUM

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

Given, van der Waal's constant for

{NH}_{3}, H_{2}, O_{2}

and

{CO}_{2}

are respectively

4.17, 0.244, 1.36 and 3.59

. Which one of the following gases is most easily liquefied?

EASY

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

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

HARD

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

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:

MEDIUM

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

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

]

MEDIUM

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

For the isothermal reversible expansion of an ideal gas

EASY

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

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

EASY

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

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}

)

MEDIUM

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

Calculate the work done during combustion of

0 .138 kg

of ethanol,

(C_{2} H_{5} OH (l))

at at

300 K.

Given:

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

and molar mass of ethanol

= 46 g {mol}^{- 1}

MEDIUM

Chemistry>Inorganic Chemistry>Nature and Behaviour of Matter>Types of Pure Substances

Select the correct options from the following statements:

I. ${}_{6}^{12}C$ and ${}_{6}^{14}C$ are isobars of each other.

II. ${}_{6}^{12}C$ reacts with ${}_{8}^{16}O$ to form a product which contains ionic bonds.

III. ${}_{20}^{40}{Ca}$ and ${}_{18}^{40}{Ar}$ are isobars of each other.

IV. ${}_{20}^{40}{Ca}$ reacts with ${}_{8}^{16}O$ to form a compound whose aqueous solution is known as lime water.

Ozone is an important constituent of the stratosphere as it blocks harmful UV rays from the Sun. Ozone has the chemical formula O3. Which word describes ozone?

Important Questions on Nature and Behaviour of Matter

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Ozone is an important constituent of the stratosphere as it blocks harmful UV rays from the Sun. Ozone has the chemical formula $O_{3}$ . Which word describes ozone?