MCQ Collection
Pakistan MCQs
Practice Pakistan questions with answers and explanations.
Choose an option to check your answer.
Correct Answer: C. 2
Explanation:
The Pauli exclusion principle allows two electrons per orbital.
They must have opposite spin quantum numbers.
Choose an option to check your answer.
Correct Answer: D. 1
Explanation:
An s subshell contains one orbital.
It can hold a maximum of two electrons.
Choose an option to check your answer.
Correct Answer: A. 3
Explanation:
A p subshell contains three orbitals.
It can hold a maximum of six electrons.
Choose an option to check your answer.
Correct Answer: B. Glycerol joined to three fatty acids
Explanation:
Triglycerides are major energy-storage lipids.
They form through ester bonds.
Choose an option to check your answer.
Correct Answer: B. 10
Explanation:
A d subshell contains five orbitals.
At two electrons per orbital, it holds ten electrons.
Choose an option to check your answer.
Correct Answer: C. Glycerol joined to three fatty acids
Explanation:
Triglycerides are major energy-storage lipids.
They form through ester bonds.
Choose an option to check your answer.
Correct Answer: C. Electrons fill lower-energy orbitals before higher-energy ones
Explanation:
The Aufbau principle guides ground-state configurations.
Actual filling order follows orbital energies.
Choose an option to check your answer.
Correct Answer: D. A fatty acid with no carbon-carbon double bonds
Explanation:
Saturated fatty acids are fully saturated with hydrogen.
They are often solid at room temperature.
Choose an option to check your answer.
Correct Answer: D. Electrons occupy equal-energy orbitals singly before pairing
Explanation:
Hund's rule minimizes electron repulsion in degenerate orbitals.
Unpaired electrons have parallel spins before pairing.
Choose an option to check your answer.
Correct Answer: A. A fatty acid with no carbon-carbon double bonds
Explanation:
Saturated fatty acids are fully saturated with hydrogen.
They are often solid at room temperature.
Choose an option to check your answer.
Correct Answer: A. No two electrons in an atom have the same four quantum numbers
Explanation:
The principle limits each orbital to two opposite-spin electrons.
It is fundamental to electron configuration.
Choose an option to check your answer.
Correct Answer: B. A fatty acid with no carbon-carbon double bonds
Explanation:
Saturated fatty acids are fully saturated with hydrogen.
They are often solid at room temperature.
