Engineering Chemistry Multiple Choice Questions on “Molecular Aggregation”.
1. The main cause of molecular aggregation is ___________
a) Conduction
b) Induction
c) Inter-molecular interactions
d) Resonance
Answer: c
Clarification: 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
Clarification: 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
Clarification: 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
Clarification: 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
Clarification: 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
Clarification: 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
Clarification: 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
Clarification: 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.