Same chapter3 marksDifficulty: Medium
What is hydrogen bonding? Explain why water has a much higher boiling point than hydrogen sulphide.
Chemical Bonding and Molecular Structure
3 marksDifficulty: Medium
Using molecular orbital theory, find the bond order of O2 and state its magnetic behaviour.
Original Khojo Papers practice question — not from a past board paper.
Answer
The bond order is 2 and the molecule is paramagnetic.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
O2 has 10 bonding and 6 antibonding electrons, so the bond order is (10 − 6)/2 = 2. Two electrons remain unpaired in the pi antibonding orbitals, which makes it paramagnetic.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
What is meant by resonance? Illustrate with the carbonate ion.
Chemical Bonding and Molecular Structure
Same chapter3 marksDifficulty: Medium
Using VSEPR theory, predict the shape of BF3, NH3 and H2O and give the reason for the difference.
Chemical Bonding and Molecular Structure
Same chapter3 marksDifficulty: Medium
What is hybridisation? State the hybridisation and shape of the carbon atom in methane, ethene and ethyne.
Chemical Bonding and Molecular Structure
Same chapter3 marksDifficulty: Medium
Explain why carbon dioxide is non-polar although each C=O bond is polar.
Chemical Bonding and Molecular Structure
Same subject3 marksDifficulty: Medium
State Hund's rule and the Aufbau principle.
Structure of Atom