INCHO Chemical Bonding Questions, Practice Problems

INCHO Chemical Bonding Questions represent a cornerstone of the chemistry InChO syllabus for competitive aspirants. This domain explores the forces that hold atoms together, the geometry of molecules, and the theoretical frameworks like Valence Bond Theory (VBT) and Molecular Orbital Theory (MOT). Because these questions often bridge the gap between organic and inorganic chemistry, they require a deep understanding of electronic configurations and spatial orientation. 

Below, we have curated a comprehensive set of INCHO chemical bonding practice questions, including INCHO chemical bonding numerical problems and INCHO chemical bonding solved questions. These resources are designed to help students navigate the complexities of the INCHO exam and refine their analytical approach toward chemical structures.

Also Read: INCHO Reaction Mechanism Questions

Important INCHO Chemical Bonding Questions

This section presents a curated set of important questions covering various difficulty levels, from multiple-choice to intensive subjective problems. These problems are designed to mirror the rigor of the actual Olympiad.

Question 1: Single Correct

Problem: Using the VSEPR model, identify the geometry of the XeF5- ion.
(A) Pentagonal planar
(B) Pentagonal bipyramidal
(C) Octahedral
(D) Square pyramidal

Answer: (A) Pentagonal planar.

Reasoning: Xenon has 8 valence electrons. In XeF5-, it has 8 + 5 + 1 = 14 electrons (7 pairs). 5 are bonding pairs and 2 are lone pairs. According to VSEPR, 7 electron pairs lead to a pentagonal bipyramidal arrangement, but with two lone pairs in the axial positions, the molecular shape is pentagonal planar.

Question 2: Multiple Correct

Problem: Consider the Molecular Orbital (MO) electronic configuration of the O2 molecule and its ions. Which of the following statements is/are CORRECT?

 (A) O2+ is more stable than O2.
(B) O2 2- is diamagnetic.
(C) The bond order sequence is O2+ > O2 > O2-.
(D) O2 has two unpaired electrons in antibonding π* orbitals.

Answer: (A, B, C, D)

Question 3: Numerical Type

Problem: Calculate the formal charge on the central Oxygen atom in the Ozone (O3) molecule.
Answer: +1
Explanation: In the most stable Lewis structure of Ozone, the central oxygen forms one double bond and one single bond, retaining one lone pair. Formal Charge = 6 - (2 lone electrons + 3 bonds) = +1.

Question 4: Integer Type
Problem: In the molecule of PCl5, how many P-Cl bonds have a different bond length compared to the others due to axial and equatorial positioning?

Answer: 2

Explanation: PCl5 has a trigonal bipyramidal geometry. The 2 axial bonds are longer than the 3 equatorial bonds due to greater repulsion from the equatorial pairs.

Question 5: Subjective Type

Problem: Explain the bonding in B2H6 (Diborane). Why is it considered an "electron-deficient" molecule?

Solution: Diborane contains two 3-center-2-electron (3c-2e) bonds, often called "banana bonds." Each Boron atom is sp3 hybridized. There are only 12 valence electrons available, which is insufficient to form standard 2-center-2-electron bonds between all atoms, thus making it electron-deficient.

INCHO Chemical Bonding Questions PDF Library

Mastering molecular structures requires consistent exposure to high-level theoretical and numerical problems. To assist your preparation, we have compiled resources that include incho chemical bonding previous year questions and curated practice sets. Use the links below to access the incho chemical bonding questions pdf materials.

How to Use Important Solutions for INCHO Chemical Bonding for Exam Preparation?

Effective use of incho chemical bonding solved questions can significantly boost your conceptual clarity. Follow these steps to maximize your readiness:

Strengthen Theoretical Foundations: Before tackling incho chemical bonding practice questions, ensure you are fluent in hybridization, dipole moments, and Molecular Orbital diagrams.

Attempt Independently: Always try to solve the incho chemical bonding numerical problems without looking at the solutions first to test your logic.

Analyze Molecular Geometry: For bonding questions, always draw the Lewis structure first. Visualizing the 3D shape helps in identifying symmetry and polarity.

Review Solved Examples: Study the incho chemical bonding solved questions to understand the step-by-step application of concepts like Lattice Energy (Born-Haber Cycle) and Fajan's Rules.

Time-Bound Practice: Use the incho chemical bonding questions pdf to simulate exam conditions, focusing on both speed and accuracy.