NCERT Solutions for Class 11 Chemistry Chapter 5 States of Matter in English Medium MCQ with explanation updated for Session 2022-2023. Class 11 Chemistry Chapter 5 MCQ, exercises and intext questions are prepared as per new syllabus.

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States of Matter

In the universe there are three states of matter as following:

    • 1. Solid
    • 2. Liquid
    • 3. Gas

Class 11 Chemistry Chapter 5 MCQ

Q1

Which of the following property of water can be used to explain the spherical shape of rain droplets?

[A]. Viscosity
[B]. Surface tension
[C]. Critical phenomena
[D]. Pressure
Q2

A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason for this observation is that at high altitude

[A]. Pressure increases
[B]. Temperature decreases
[C]. Pressure decreases
[D]. Temperature increases
Q3

The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles but their magnitude depends upon

[A]. Charge of interacting particles.
[B]. Mass of interacting particles.
[C]. Polarizability of interacting particles.
[D]. Strength of permanent dipoles in the particles.
Q4

Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess partial charges. The partial charge is

[A]. More than unit electronic charge
[B]. Equal to unit electronic charge
[C]. Less than unit electronic charge
[D]. Double the unit electronic charge

What is a Solid?

The molecules in a solid are closely packed together and contain the least amount of kinetic energy. A solid is characterized by structural rigidity and resistance to a force applied to the surface. Examples of Solids are: Gold, Wood, Sand, Steel etc.

Liquid State of Matter

A liquid is a sample of matter that conforms to the shape of a container in which it is held, and which acquires a defined surface in the presence of gravity. The term liquid is also used in reference to the state, or condition, of matter having this property. For examples: water, oil, milk etc.

Class 11 Chemistry Chapter 5 Multiple Choice Questions

Q5

The pressure of a 1:4 mixtures of dihydrogen and dioxygen enclosed in a vessel is one atmosphere. What would be the partial pressure of dioxygen?

[A]. 0.8×10⁵ atm
[B]. 0.008 Nm⁻²
[C]. 8×10⁴ Nm⁻²
[D]. 0.25 atm
Q6

As the temperature increases, average kinetic energy of molecules increases. What would be the effect of increase of temperature on pressure provided the volume is constant?

[A]. Increases
[B]. Decreases
[C]. Remains same
[D]. Becomes half
Q7

What is SI unit of viscosity coefficient (η)?

[A]. Pascal
[B]. Nsm⁻²
[C]. km⁻² s
[D]. Nm⁻²
Q8

How does the surface tension of a liquid vary with increase in temperature?

[A]. Remains same
[B]. Decreases
[C]. Increases
[D]. No regular pattern is followed

Gaseous State of Matter

Gas is a type of matter that has no defined shape or volume. Gases can be made up of a single element, such as hydrogen gas (H₂), a compound, such as carbon dioxide (CO₂), or a mixture of several gases, such as air.

Intermolecular Forces

The term “Intermolecular forces” is used to describe the forces of attraction. Between atoms, molecules, and ions when they are placed close to each other. This is different from Intramolecular forces which is another word for the covalent bonds inside molecules.

Class 11 Chemistry Chapter 5 Important Extra Questions

Two different gases ‘A’ and ‘B’ are filled in separate containers of equal capacity under the same conditions of temperature and pressure. On increasing the pressure slightly, the gas ‘A’ liquefies but gas B does not liquefy even on applying high pressure until it is cooled. Explain this phenomenon.

Gas A is at or below its critical temperature and gas B is at a temperature higher than critical temperature.

Name the energy which arises due to motion of atoms or molecules in a body. How is this energy affected when the temperature is increased?

Thermal energy. It is a measure of average kinetic energy of particles. It increases with increase in temperature.

The critical temperature (Tc) and critical pressure (Pc) of CO₂ are 30.98°C and 73 atm respectively. Can CO₂ (g) be liquefied at 32°C and 80 atm pressure?

CO₂ cannot be liquefied at 32°C by applying a pressure of 80 atm. This is because the temperature is greater than critical temperature of CO₂.

Dipole – Dipole Forces

Dipole–dipole forces occur between molecules with permanent dipoles (i.e., polar molecules). For molecules of similar size and mass, the strength of these forces increases with increasing polarity. Polar molecules can also induce dipoles in nonpolar molecules, resulting in dipole–induced dipole forces.
Examples of a dipole–dipole interaction can be that between polar molecules, such as hydrogen chloride (HCl), carboxylic acids (i.e., acetic acid), and amino acids.

Boyle’s Law

Boyle’s Law (Pressure – Volume Relationship)
At constant temperature, the pressure of a fixed amount (i.e., number of moles n) of gas varies inversely with its volume. This is known as Boyle’s law.
Mathematically, it can be written as
p ∝ 1/V (at constant T and n)
or p = k₁ (1/V)

Charles’ Law

Charles’ Law (Temperature – Volume Relationship): Charles’ law, which states that pressure remaining constant, the volume of a fixed mass of a gas is directly proportional to its absolute temperature.

Gay Lussac’s Law (Pressure- Temperature Relationship)
It states that at constant volume, pressure of a fixed amount of a gas varies directly with the temperature. Mathematically,
P ∝ T
or P/T = Constant

Avogadro Law

Avogadro Law (Volume – Amount Relationship)
It states that equal volumes of all gases under the same conditions of temperature and pressure contain equal number of molecules.
V ∝ n (Where n is the number of moles of the gas)
or V = K₄n
Note:
The number of molecules in one mole of a gas has been determined to be 6.022 ×10²³ and is known as Avogadro constant.

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