MEDIUM

Earn 100

Which gas boils out first during fractional distillation of air.

50% studentsanswered this correctly

Important Questions on Matter in our Surroundings

MEDIUM

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

Which of the following curves best represents the variation in density of water with temperature?

MEDIUM

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

Latent heat of vaporisation is

MEDIUM

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

Useful substance in preparation of freezing mixture is

EASY

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

The melting point of ice is _____.

HARD

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

The melting point of naphthalene is

80 ° C

and the room temperature is

30 ° C

. A sample of liquid naphthalene at

100 ° C

is cooled down to the room temperature. Draw a temperature time graph to represent this cooling. In the graph, mark the region which corresponds to the freezing process.

EASY

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

"Complete melting of ice cream will not happen suddenly". Explain.

MEDIUM

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

When does ice melt at the same temperature $0 ° C$ (273 Kelvin), which one of the following has more energy?

MEDIUM

Science>Chemistry>Matter in our Surroundings>Interconversion 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>Interconversion of Matter

An earthen pitcher used in summer cools water in it essentially by evaporation of water from its porous surface. If a pitcher carries

4 kg

of water and the rate of evaporation is

20 g

per hour, temperature of water in it decreases by

Δ T

in two hours. The value of

Δ T

is close to (ratio of latent heat of evaporation to specific heat of water is

540 ° C

)

MEDIUM

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

Explain the liquefaction and zone refining method of refining of metals. (draw diagram)

EASY

Science>Chemistry>Matter in our Surroundings>Interconversion 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}

)

HARD

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

1 kg

of ice at

- 20^{o} C

is mixed with

2 kg

of water at

90^{o} C

. Assuming that there is no loss of energy to the environment, what will be the final temperature of the mixture? (Assume latent heat of ice

= 334.4 kJ {(kg)}^{- 1}

, specific heat of water and ice are

4.18 kJ {(kg - K)}^{- 1}

and

2.09 kJ {(kg - K)}^{- 1}

, respectively.)

MEDIUM

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

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

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

Dry ice is

HARD

Science>Chemistry>Matter in our Surroundings>Interconversion 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:

HARD

Science>Chemistry>Matter in our Surroundings>Interconversion 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:

HARD

Science>Chemistry>Matter in our Surroundings>Interconversion 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)

MEDIUM

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

The Clausius-Clayperon equation helps to calculate

MEDIUM

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

A Carnot freezer takes heat from water at

0^{o} C

inside it and rejects it to the room at a temperature of

27^{o} C .

The latent heat of ice is

336 \times 10^{3} J k g^{- 1} .

If 5kg of water at

0^{o} C

is converted into ice at

0^{o} C

by the freezer, then the energy consumed by the freezer is close to :

HARD

Science>Chemistry>Matter in our Surroundings>Interconversion of Matter

Assume that a drop of a liquid evaporates by a decrease in its surface energy so that its temperature remains unchanged. The minimum radius of the drop for this to be possible is. (The surface tension is

T

, the density of the liquid is

ρ

and

L

is its latent heat of vaporisation.)

Which gas boils out first during fractional distillation of air.

Important Questions on Matter in our Surroundings

Learn and Prepare for any exam you want !