Engineering Chemistry MCQ (Molecular Aggregation)

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Engineering Chemistry MCQ (Molecular Aggregation)

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1. The main cause of molecular aggregation is ___________
a) Conduction
b) Induction
c) Inter-molecular interactions
d) Resonance
Answer: c
Explanation: The main cause of molecular aggregation is inter-molecular
interactions. Inter-molecular interactions stem from the electric properties of
atoms. Being the cause of molecular aggregation, inter-molecular forces are at the
roots of chemistry and are the fabric of the world.

2. From where does the inter-molecular interaction originate?
a) From the electric properties of atoms
b) From the cohesive properties of atoms
c) From the magnetic properties of atoms
d) None of the mentioned
Answer: a
Explanation: Inter-molecular interactions originate from the electric properties of
atoms. Inter-molecular interactions stem from the electric properties of atoms.
Being the cause of molecular aggregation, inter-molecular forces are at the roots of
chemistry and are the fabric of the world.

3. Which of the following is not a state of aggregation of matter?
a) Solid
b) Liquid and Gas
c) Plasma
d) None of the mentioned
Answer: d
Explanation: Solid, liquid, gas and plasma are the four states of aggregation of matter.

4. The process by which individual molecules form the defined aggregate is called ___________
a) Self-aggregation
b) Self-assembly
c) Aggregation
d) Assembly
Answer: b
Explanation: The process by which individual molecules form the defined aggregate
is called self-assembly. Molecular self-assembly is the process by which molecules
adopt a defined arrangement without guidance or management from an outside source.

5. In water, non-polar molecules tend to aggregate because they are forced to come into close proximity with each other due to ___________
a) Hydrophobic interactions
b) Hydrophilic interactions
c) Vander Waals interactions
d) Electrovalent interactions
Answer: a
Explanation: In water, non-polar molecules tend to aggregate because they are
forced to come into close proximity with each other due to hydrophobic interactions.

6. Which type of molecules forms aggregate through a self-assembly process that is driven by the hydrophobic effect?
a) Electrophilic
b) Nucleophilic
c) Ambiphilic
d) None of the mentioned
Answer: c
Explanation: Ambiphilic molecules form aggregate through a self-assembly process
that is driven by the hydrophobic effect. Molecular self-assembly is the process by
which molecules adopt a defined arrangement without guidance or management from an outside source.

7. Why metallic bonds are non-directional?
a) Because there is a uniform distribution of mobile valence electrons around the kernels
b) Because there is a non-uniform distribution of mobile valence electrons around the kernels
c) There is no change in inter-kernel distance
d) There is a change in inter-kernel distance
Answer: a
Explanation: Metallic bonds are non-directional because there is a uniform
distribution of mobile valence electrons around the kernels, provided there is no change in inter-kernel distance.

8. The number of molecules in a conduction band ___________
a) Increases with fall in temperature
b) Decreases with a rise in temperature
c) Increases with a rise in temperature
d) Does not depend upon the temperature
Answer: c
Explanation: The number of molecules in the conduction band increases with the
rise in temperature. At high temperatures, randomness increases and more
molecules move towards the conduction band.