Chemistry — Previous Year Papers
TGBIE IPE previous year Chemistry questions — repeated topics and selected questions from recent exams.
Topics That Repeat Every Year
Every yearAtomic Structure — Bohr's model derivation or quantum mechanical model
Every yearChemical Bonding — hybridisation or MOT LAQ
Every yearThermodynamics — Hess's law or Gibbs energy calculation
Every yearChemical Equilibrium — Kc/Kp + Le Chatelier application
Every yearOrganic — benzene reactions or alkene addition mechanisms
Almost every years-Block — preparation of Na₂CO₃ or NaOH
Very frequentStates of Matter — ideal gas or kinetic theory SAQ
FrequentPeriodic Properties — trend explanation SAQ
Selected Questions from Past IPE Papers
IPE 2024 — Selected Questions
- 1.Derive the expressions for radius and energy of nth orbit in Bohr's model of hydrogen atom. (7 marks)
- 2.Explain molecular orbital theory. Write the MO configuration of N₂ and O₂. Compare bond orders and magnetic properties. (7 marks)
- 3.What is Hess's law? Using thermochemical equations, calculate the enthalpy of formation of CH₄. (7 marks)
- 4.Explain with examples: (i) inductive effect (ii) resonance effect (iii) electromeric effect. (4 marks)
- 5.Write the preparation and properties of sodium carbonate. Give two uses. (4 marks)
IPE 2023 — Selected Questions
- 1.State Le Chatelier's principle. Explain its application to (i) synthesis of ammonia (ii) synthesis of SO₃. (7 marks)
- 2.Explain electrophilic aromatic substitution. Give the mechanism of nitration of benzene. (7 marks)
- 3.Derive the ideal gas equation. What is van der Waals equation and why is it more accurate for real gases? (7 marks)
- 4.What is Gibbs energy? Derive the relationship ΔG = ΔH − TΔS. Explain the four cases of spontaneity. (7 marks)
- 5.Explain sp³ hybridisation in CH₄ and sp² in C₂H₄ with orbital diagrams. (4 marks)