LU B.Sc Sem 3 Chemistry Physical Chemistry-I Important Questions 2026 | PYQ Pattern
LU B.Sc 3rd Semester Chemistry (Physical Chemistry-I) Important Questions 2026 – Lucknow University (LU) aur affiliated colleges ke B.Sc NEP Semester III (PCM & ZBC group) students ke liye Chemistry – Physical Chemistry-I ke sabse important questions, bilkul previous year question paper (PYQ) pattern me. Saare questions neeche page par hi hain – section-wise.
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Paper Details – B.Sc Sem 3 Chemistry (LU NEP 2026)
| University | University of Lucknow (LU) + affiliated colleges |
| Course | B.Sc. III Semester (NEP) – PCM & ZBC |
| Paper | Chemistry – Physical Chemistry-I |
| Time / Marks | 2 Hours / 75 Marks |
| Pattern | Kul 4 questions: Section A se 1 (15 marks) + Section B se 3 (20 marks each) |
Section A – Important Questions (15 Marks)
Note: Section A se koi ek question attempt karna hai.
Q1. (a) Find ∫ sin x cos x dx and d/dx (eˣ logₑ x).
(b) Find ‘n’ if ⁿP₄ : ⁿ⁻¹P₃ = 9 : 1.
(c) Express (1000.4375)₁₀ in binary.
(d) Find the equation of the line through P(1, –4) and Q(2, 3).
(e) A bag has 7 black, 6 white and 5 red balls. Two balls are drawn at random; find the probability that both are red. [15 Marks]
Q2. (a) Prove that the half-life of a first order reaction does not depend on the initial concentration.
(b) State the postulates of the kinetic theory of gases.
(c) What is meant by mean free path?
(d) What are catalytic promoters and catalytic poisons?
(e) Why does applying alum stop bleeding? [15 Marks]
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Section B – Important Questions (20 Marks)
Note: Section B se koi teen questions attempt karne hain.
Q3. What are the shortcomings of PV = RT and how did van der Waals correct them? Obtain the critical constants in terms of ‘a’ and ‘b’. For a Van der Waals gas, Pc = 100 atm and b = 50 cm³ mol⁻¹; find its critical temperature. [20 Marks]
Q4. Explain Maxwell’s distribution of molecular velocities. Find the rms velocity of N₂ at 27°C and the temperature at which the average velocity of oxygen equals that of hydrogen at 20 K. [20 Marks]
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Q5. How does the order of a reaction differ from molecularity? Obtain the rate constant of a first order reaction. A first order reaction is 40% complete in 50 minutes; find its rate constant and the time for 80% completion. [20 Marks]
Q6. (a) Discuss the effect of temperature on reaction rate using the Arrhenius equation.
(b) A second order reaction has rate constant 5.70 × 10⁻⁵ dm³ mol⁻¹ s⁻¹ at 25°C and 1.64 × 10⁻⁴ dm³ mol⁻¹ s⁻¹ at 40°C. Find the activation energy. [20 Marks]
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Q7. Obtain Bragg’s equation and explain how it is used to determine crystal structure. State the law of rational indices and define Miller indices. [20 Marks]
Q8. What is the Joule-Thomson effect? Show that the Joule-Thomson coefficient is zero for an ideal gas. Also show that Cp – Cv = R. [20 Marks]
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Q9. (a) Obtain Kirchhoff’s equation.
(b) The enthalpies of combustion of methane, graphite and hydrogen are 890.2, 393.4 and 285.7 kJ mol⁻¹. Find the enthalpy of formation of methane. [20 Marks]
Q10. Write short notes on: (a) Tyndall effect (b) Gold number (c) Hardy-Schulze rule (d) Electrophoresis [20 Marks]
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Exam Tips – Chemistry (Physical Chemistry-I)
- Section A ke long answers ke short notes bana lo – 15 marks pakke karo.
- Section B ke derivations / numericals / diagrams ki practice karo.
- Upar ke questions ko 2 ghante me PYQ ki tarah solve karke dekho.
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FAQs
LU B.Sc 3rd Semester Chemistry (Physical Chemistry-I) exam me kitne questions attempt karne hote hain?
Ye 75 marks ka 2 ghante ka paper hai. Kul 4 questions attempt karne hote hain – Section A se 1 question (15 marks) aur Section B se 3 questions (20-20 marks).
Kya ye LU B.Sc Sem 3 Chemistry ka official previous year question paper (PYQ) hai?
Nahi. Ye LUUPDATE team ka banaya 2026 exam ke liye most important questions ka set hai, jo Lucknow University ke previous year papers ke pattern aur NEP syllabus par based hai.
B.Sc Sem 3 Chemistry Physical Chemistry-I ke answers / solutions kahan milenge?
LUUPDATE ke Most Important Questions course (BA, B.Sc, B.Com Sem I, III & V) me har question ka pura solution milta hai – sirf ₹99 me, LUUPDATE App par.
Ye paper kis group ke liye hai – PCM ya ZBC?
Chemistry (Physical Chemistry-I) LU B.Sc NEP Semester III ke PCM & ZBC group ke students ke liye hai.
Disclaimer: Ye LUUPDATE team dwara taiyar kiye gaye expected important questions hain (previous year pattern par), Lucknow University ka official question paper nahi. Exam pattern aur syllabus ke liye university ka official notice zaroor dekhein.
