Calcutta University B Sc Chemistry Question Paper (Must Try)

a) State the Second Law of Thermodynamics in terms of entropy. b) Define the term "Gibbs Free Energy". What is the condition for spontaneity in terms of Gibbs free energy at constant temperature and pressure? c) What is meant by "order of a reaction"? Can a reaction have a fractional order? d) State the difference between a "reversible" and an "irreversible" process. e) Define the term "phase" as used in the Phase Rule. f) Write the expression for the rate constant of a first-order reaction. g) What is the significance of the term 'collision frequency' in the collision theory of reaction rates?

| Section | Type of Questions | Marks per Question | Total Marks Contribution | | :--- | :--- | :--- | :--- | | | Multiple Choice Questions (MCQs) / Very Short Answer | 1 | 10 - 15 | | Group B | Short Answer (Concepts, derivations, mechanisms) | 2 or 3 | 15 - 20 | | Group C | Long Answer / Analytical Problems | 5 or 10 | 25 - 30 | Calcutta University B Sc Chemistry Question Paper

Remember: The examiner is not trying to trick you. The patterns are consistent. The topics are predictable. Your job is to decode that pattern using the power of past question papers. a) State the Second Law of Thermodynamics in

: Larger questions (3–5 marks) involving multi-step synthesis, mathematical derivations, or explaining chemical phenomena. Time Duration for a 50-mark paper and for 25-mark modules. Deep Review by Chemistry Branch Based on recent papers from Gurudas College , the following topics are frequently tested: High-Yield Topics Question Style Examples c) What is meant by "order of a reaction"

$5 \times 2 = 10$