This set of Class 11 Chemistry Chapter 5 Multiple Choice Questions & Answers (MCQs) focuses on “States of Matter – Intermolecular Forces vs Thermal Interactions”.
1. What is the result of balancing between intermolecular forces and thermal energy?
a) matter
b) three States of matter
c) four States of matter
d) chemical bond formation
View Answer
Explanation: In a molecule, intermolecular forces always tend to keep molecules with each other while the thermal energy always tries to separate them. So the result of balancing between intermolecular energy and thermal energy is three States of matter.
2. Which state of matter is likely to form when there is a predominance of intermolecular energy?
a) solid
b) liquid
c) gas
d) both solid and gas
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Explanation: When there is a predominance of intermolecular energy in the matter, the order of states of matter that are the likely to form is solids, liquids and then gases. It follows reverse order in case of the predominance of thermal energy.
3. A gas can be liquefied only through an increase in compression.
a) true
b) false
View Answer
Explanation: The above statement is false because gas cannot be liquefied only through compression, even the temperature needs to be lowered in order to compress the gas. This is because of the reaction of intermolecular forces and thermal energy between the molecules.
4. Gas is readily formed in case of predominance of ___________
a) intermolecular energy
b) thermal energy
c) both intermolecular energy and thermal en energy
d) neither intermolecular energy nor thermal energy
View Answer
Explanation: In the case of the predominance of thermal energy, the gas is likely to be formed rather than liquids and solids. This happens because the thermal energy tends to separate the molecules in a substance.
5. In the case of ice which energy do you think that is predominant?
a) Thermal energy
b) Intermolecular energy
c) Intermolecular energy
d) Heat energy
View Answer
Explanation: In case of ice the molecules are tightly packed and we do know that in solid the intermolecular forces are so high that they are tightly packed so intermolecular energy is predominant in case of ice.
6. The following are the temperatures of milk in Celsius. In which of the following, do you think intermolecular forces are predominant than thermal energy?
a) 35
b) 82
c) 50
d) 9
View Answer
Explanation: The rise in temperature depicts thermal energy. So among the given options at 82 degrees Celsius the milk has the highest thermal energy and at 9 degrees Celsius the milk has higher intermolecular energy. So at 9 degrees, the intermolecular forces are predominant than thermal energy in milk.
7. What is a term used for the conversion of solid into gas directly?
a) Evaporation
b) Sublimation
c) Condensation
d) Melting
View Answer
Explanation: The process of direct conversion of solid to gases is sublimation while the process of conversion of liquid to gas is evaporation whereas the process of conversion of solid to liquid is melting and liquid to solid is condensation.
8. Particles in a solid __________
a) are tightly packed
b) are loosely packed
c) move continuously
d) collide with each other
View Answer
Explanation: When there is a predominance of intermolecular energy instead of thermal energy, the molecules are tightly packed and have a definite shape and structure; these are called solids. So in solid, the particles are tightly packed.
9. Compressibility is high in case of ___________
a) solids
b) liquids
c) gases
d) both solids and liquids have the same amount of compressibility
View Answer
Explanation: Compressibility is high in the case of gases because thermal energy is predominant in gases. This energy enables the molecules of gases to move away from each other so that when compressed together they compress easily by reducing the distance between each other comparatively.
10. During the process of freezing the temperature is _________
a) constant
b) increasing
c) decreasing
d) irregular
View Answer
Explanation: During the process of freezing the water, water converts into ice that means new bonds are creating during this process and the temperature remains constant but the internal energy changes during this phase.
Sanfoundry Global Education & Learning Series – Chemistry – Class 11.
To practice all chapters and topics of class 11 Chemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.
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