This PDF is a Class 11 Chemistry worksheet on Chemical Bonding and Molecular Structure, prepared mainly for NEET and other competitive exam practice. It contains 75 multiple-choice questions with detailed explanations, covering VSEPR theory, hybridisation, molecular orbital theory, bond order, bond length, dipole moment, resonance, hydrogen bonding, and exceptions related to noble gases and expanded octet compounds. The worksheet is heavily concept-driven and closely aligned with NCERT content.

I am writing about this worksheet because Chemical Bonding is one of the most fundamental yet confusing chapters for many students. It connects atomic structure with molecular shape, stability, and reactivity. Analysing a solved worksheet like this helps students understand not just the correct answers, but also the logic behind them. This article explains only what is present in the uploaded worksheet and how it reflects real exam expectations Chemical Bonding and Molecular ….

Structure and Nature of the Worksheet

The worksheet consists of 75 MCQs, each followed by a short explanation. The questions range from basic definition-based to moderate conceptual and numerical reasoning. Most answers are supported using standard theories such as VSEPR, Valence Bond Theory, and Molecular Orbital Theory, making the worksheet suitable for revision as well as concept strengthening.

The difficulty level is mostly moderate, which is ideal for NEET-level preparation.

VSEPR Theory and Molecular Geometry

A significant portion of the worksheet focuses on molecular shape prediction using VSEPR theory. Questions explain shapes such as:

• Pentagonal bipyramidal geometry in IF₇
• Octahedral geometry with lone pair distortion in BrF₅
• Linear, trigonal planar, tetrahedral, and see-saw shapes

The worksheet repeatedly highlights that lone pair–lone pair repulsion is strongest, followed by lone pair–bond pair and bond pair–bond pair repulsion. This concept is essential for predicting real molecular shapes and bond angle deviations.

Hybridisation and Molecular Shape

Hybridisation-based questions are spread throughout the worksheet. It explains:

• sp, sp², and sp³ hybridisation using electron pair count
• Hybridisation in ions such as NO₂⁺, NO₃⁻, and NH₄⁺
• sp³d² hybridisation leading to octahedral geometry

The worksheet reinforces that hybridisation depends on the number of bonded and non-bonded electron pairs, not just the number of bonds.

Molecular Orbital Theory and Bond Order

One of the strongest sections of the worksheet is Molecular Orbital Theory (MOT). Several questions calculate bond order and magnetic behaviour for species like:

• O₂, O₂⁺, and O₂⁻
• N₂, CO, and NO⁺
• NO as an odd-electron paramagnetic species

The worksheet clearly shows that:

• Higher bond order means greater stability and shorter bond length
• Paramagnetism arises due to unpaired electrons
• Isoelectronic species can have similar bond orders but different properties

These are high-frequency NEET concepts.

Download this Chemical Bonding and Molecular Structure PDF File: Click Here

Bond Length, Bond Strength, and Bond Order

Multiple MCQs focus on the relationship between bond length, bond strength, and bond order. The worksheet repeatedly confirms that:

• Triple bonds are shortest and strongest
• Bond length is inversely proportional to bond order
• Removal of electrons from antibonding orbitals increases bond order

Examples like C–O, C=O, and C≡O comparisons are used to make this clear.

Dipole Moment and Polarity

Dipole moment is explained as a vector quantity depending on charge separation and distance. Questions show why:

• H₂O has a higher dipole moment than NH₃ and HF
• Symmetrical molecules may have zero dipole moment despite polar bonds

This helps students understand molecular polarity beyond electronegativity values.

Resonance and Formal Charge

The worksheet includes conceptual questions on:

• Resonance hybrid having real existence, not canonical forms
• Formal charge calculation and its role in stability
• Nitrate and carbonate ions having similar trigonal planar geometry

These questions are common traps in exams if resonance is not clearly understood.

Hydrogen Bonding and Intermolecular Forces

Hydrogen bonding concepts are tested through questions comparing boiling points of HF, H₂O, and NH₃. The worksheet explains that although HF has stronger individual hydrogen bonds, water forms more hydrogen bonds per molecule, leading to a higher boiling point.

This type of reasoning-based question is frequently asked in NEET.

Expanded Octet and Noble Gas Compounds

The worksheet includes questions on:

• Expanded octet in molecules like H₂SO₄
• Inertness of noble gases due to completely filled valence shells
• Conditions under which noble gases form compounds

These questions reinforce periodic trends and electronic configuration concepts.

What Students Learn from This Worksheet

From this worksheet, students clearly learn that:

• Chemical bonding questions are logic-based, not memory-based
• NCERT definitions and exceptions are extremely important
• MOT and VSEPR are scoring if understood properly
• Many NEET questions repeat the same ideas in different forms

Regular practice of such solved worksheets improves accuracy and confidence.