Classification of Matter

Q. Some statements about heavy water are given below.
(i) Heavy water is used as moderator in nuclear reactors.
(ii) Heavy water is more associated than ordinary water.
(iii) Heavy water is more effective solvent than ordinary water.
Which of the above statements are correct?

1. (ii) and (iii)
2. (i), (ii) and (iii)
3. (i) and (iii)
4. (i) and (ii)

Q.

Why are liquids and gases categorised as fluids ?

Q.

Physical properties of ice, water and steam are very different . What is the chemical composition of water in all the three states?

Q. The intermolecular force that is inversely proportional to $r^6$ among the following:
(Where r is the distance between the two atoms)

1. London force
2. Ion - ion interaction
3. Ion - dipole interaction
4. Dipole - dipole interaction

Q.

What happens when you open a bottle of perfume?

1. Diffusion

2. Decantation

3. Sublimation

4. None of these

Q. Name two poisonous gases which can be prepared from chlorine gas.

Q.

Which state of matter has neither definite shape nor volume?

Q.

Gases have higher density as compared to other states of matter.

1. True
2. False

Q. The temperature and pressure at which ice, liquid water and water vapour can exist together are

1. 0°C, 1atm

2. 2°C, 4.7atm

3. 0°C, 4.7mm

4. 2°C, 4.7mm

Q.

The force of attraction between the particles decreases if the distance between them and vice versa.

Q.

Which state of matter has the least density?

Q.

The behaviour of matter in differnet states is governed by various physical laws. According to you, what are the factors that determine the state of matter?

Q. What is the effect on chemical properties and physical properties of water when temperature is changed?

1. Chemical properties of water remain same but the physical state changes with change in temperature
2. Chemical properties of water change with change in temperature but physical properties remain same
3. There is no effect on chemical or physical properties of water when temperature is changed
4. Both chemical and physical properties of water change with change in temperature

Q.

Gases are highly compressible.

1. True
2. False

Q.

With regard to the gaseous state of matter which of the following statements are correct?

(a) The complete order of molecules (b) Complete disorder of molecules

(c) Random motion of molecules (d) Fixed position of molecules

Q.

Gases can occupy all available volume of a vessel because their molecules are free to move around and the intermolecular forces are negligible.

1. True
2. False

Q. The conductances, equivalent conductivity and molar conductivity increase with dilution.

1. True
2. False

Q.

Three gases, methane, ammonia and water vapour which have comparable molecular masses are liquefied at the same temperature. However, the pressure required to be applied is different for the three gases. Justify.

Q. Gases have fixed shape and volume.

1. True
2. False

Q.

5. The intermolecular forces are the smallest in case of gases

1. True
2. False

Q.

The Particle Theory of Matter help to explain the property and behaviour of matter.

1. True
2. False

Q.

Molecules are in a constant state of motion.

1. True
2. False

Q.

Gases gave large inter-particle spaces between the molecules, this accounts for the high _____of gases

Q.

Four gases A, B, C, and D have critical temperatures of $32°C,-118°C,31.1°C,–140°C$, respectively. Arrange them in the increasing order of ease of liquefaction of the gases

1. D<B<C<A

2. A>B>D>C

3. C<D<B<A

4. A<C<B<D

Q.

Ice, water and water vapour look physically different but they are ___________ same

Q.

The state of matter which can easily flow in all directions

Q.

Describe an experiment to show that a gas expands on heating.

Q.

Odd one out:

1. Water

2. Milk

3. Juice

4. Air

5. Alcohol

Q.

Give reasons for the following:

Gases can be compressed easily

Q.

Write two effects of Van der Waals forces of attraction?