Characteristics of Particles

Q.

The force of attraction between molecules of a substance is called the intermolecular force of attraction.

1. True
2. False

Q.

Define matter. List any two properties of matter.

Q. have the least intermolecular distance between their particles.

1. Solids
2. Gases
3. Liquids

Q.

How is the kinetic energy of the constituent particles of matter affected by the change in temperature?

Q.

Name the state of matter in which particles flow faster than liquids.

Q.

The kinetic energy of particle ………… on cooling (increases/decreases).

Q.

The space between the molecules is called the intermolecular force of attraction

1. True
2. False

Q.

Tick (✔) the most appropriate option.

Matter has:

1. weight

2. volume

3. both (A) and (B)

4. none of these

Q.

The intermolecular forces are the strongest in

1. liquids

2. solids

3. liquids and solids

4. gases

Q.

The substances which are capable of holding water molecules from the surroundings at room temperature are known as _______________ substances.

Q.

Match the following and choose the correct answer
$\begin{array}{cc}\text{(i)}\text{Solid}& \text{(a)}\text{Super energetic particles}\\ \text{(ii)}\text{Liquid}& \text{(b)}\text{No shape nor fixed volume at a given pressure}\\ \text{(iii)}\text{Gas}& \text{(c)}\text{Has definite shape}\\ \text{(iv)}\text{Plasma}& \text{(d)}\text{Definite shape with less molecular forces than that in solids}\end{array}$

1. (i) – a, (ii) – b, (iii) – c, (iv) – d

2. (i) – c, (ii) – d, (iii) – b, (iv) – a

3. (i) – c, (ii) – d, (iii) – a, (iv) – b

4. (i) – a, (ii) – d, (iii) – b, (iv) – c

Q. An increase in the temperature of a substance results in an increase in the space between the particles.

1. True
2. False

Q. Assertion (A) : Ice at $0°C$ has greater cooling effect than water at the same temperature.​
Reason (R) : Ice contains latent heat of fusion.​

1. (A) is true but (R) is false.
2. Both (A) and (R) are correct and (R) is correct explanation of (A).
3. Both (A) and (R) are correct and (R) is not correct explanation of (A).
4. (R) Is true but (A) is false.

Q.

Matter occupies space and has mass

1. True
2. False

Q.

79 Air does not occupy space.

1. True
2. False

Q.

Among the following, identify the substance in which molecules possess vibratory, rotatory and translatory motions in all directions except in one direction.

1. bromine

2. iodine

3. ammonia

4. silicon dioxide