VSEPR Geometry & Repulsion Order
Lone Pair-Lone Pair > Lone Pair-Bond Pair > Bond Pair-Bond Pair. CH₄ (tetrahedral 109.5°), NH₃ (pyramidal 107°), H₂O (bent 104.5°).
Grade 11th · Chemistry · Chemical Bonding
Chemical Bonding: VSEPR, Hybridisation & MOT
Master Chemical Bonding: VSEPR, Hybridisation & MOT for Grade 11th Chemistry. Includes verified formulas, core concepts, step-by-step checklists, and interactive solver tools.
Science StreamAdvanced Level
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Essential Formulas & Mathematical Definitions
Bond Order = ½ (Nb - Na)
Dipole Moment: μ = q · d (Debye)
Formal Charge = V - N - ½B
Molecular Orbital Theory (MOT)
Atomic orbitals combine to form bonding (lower energy) and antibonding (higher energy) MOs. Unpaired electrons indicate paramagnetism (e.g. O₂).
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Exam Day Revision & Problem Solving Checklist
- ✓Calculate hybridization using Steric Number = (σ bonds + lone pairs on central atom)
- ✓Bond order > 0 implies stable molecule; higher bond order = shorter bond length
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High-Yield Exam Strategy & Scoring Tips
Step-by-Step Mark Allocation
Always state the governing principle or formula first, write given values with standard SI units, substitute clearly, and highlight the final numerical answer with units in a box for full step marking.
Common Calculation Traps
Watch for unit prefixes (cm to m, minutes to seconds, g to kg, degrees to radians). In coordinate and ray optics problems, double-check Cartesian sign conventions before computing.
Recommended Practice & Calculation Tools
Test your understanding and perform instant calculations with these free online utilities.
Chemistry Molar Mass & Solution Molarity Calculator
Find molecular mass from chemical formulas (H2SO4, NaCl, C6H12O6) and calculate solution concentration and dilution.
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Structure of Atom: Bohr Model & Quantum Numbers
Master Structure of Atom: Bohr Model & Quantum Numbers for Grade 11th Chemistry. Includes verified formulas, core concepts, step-by-step checklists, and interactive solver tools.
Structure of AtomStructure of Atom: Bohr Model & Quantum Numbers: Core Theory, Derivations & Solved Proofs
In-depth theoretical breakdown, mathematical derivations, foundational axioms, and step-by-step proofs. covering Structure of Atom: Bohr Model & Quantum Numbers for Class 11th Chemistry.
Structure of AtomStructure of Atom: Bohr Model & Quantum Numbers: Formula Cheat Sheet & Solved Numericals
Complete formula reference, variable dimensions, numerical step-by-step problem-solving templates, and sample calculations. covering Structure of Atom: Bohr Model & Quantum Numbers for Class 11th Chemistry.
Structure of AtomStructure of Atom: Bohr Model & Quantum Numbers: Exam Revision Checklist & High-Yield PYQs
Board exam previous year questions, high-frequency question patterns, common calculation traps, and rapid revision notes. covering Structure of Atom: Bohr Model & Quantum Numbers for Class 11th Chemistry.
Frequently Asked Exam Questions & Concept Clarifications
Why is O₂ paramagnetic?
MOT shows O₂ contains 2 unpaired electrons in degenerate antibonding π*2px and π*2py molecular orbitals.