LU B.Sc. Inorganic Chemistry-I Previous Year Question Paper — Semester I 2023
First Paper — Inorganic Chemistry-I (Paper Code 31043).Regular / Improvement. Attempt any five questions. All questions carry equal marks (15 marks each; 5 marks per part where a question has three parts). Maximum marks 75 · Time 3 hours.
Paper Details
- University
- Lucknow University (LU)
- Course
- B.Sc. (Bachelor of Science)
- Semester
- Semester I
- Year of Exam
- 2023
- Exam Type
- Regular / Improvement
- Paper
- First Paper — Inorganic Chemistry-I
- Paper Code
- 31043
- Maximum Marks
- 75
- Time Allowed
- 3 hours
Attempt any five questions. All questions carry equal marks (15 marks each; 5 marks per part where a question has three parts).
Semester I 2023 Question Paper
Questions (Text Version)
- Q1
- (a)Explain Pauli’s exclusion principle with example.
- (b)Draw Born-Haber cycle for NaCl.
- (c)Explain diagonal relationship with example.
- Q2
Explain VSEPR theory. On the basis of this theory, explain ClF₃, SF₄, SF₆ and I₃⁻.
- Q3
- (a)What is the radius ratio rule? What are its limitations?
- (b)Explain Fajan’s rule with examples.
- (c)What are lattice defects? Explain stoichiometric lattice defects with example.
- Q4
Define the term electronegativity. What are the factors that affect electronegativity? Discuss the variation of electron affinity in the periodic table. What are the different theories of electronegativity?
- Q5
- (a)CO₂ is a gas but SiO₂ is a hard solid. Why?
- (b)Among the boron trihalides, explain why BF₃ is least acidic while BI₃ is most acidic.
- (c)Why is CCl₄ resistant to hydrolysis but SiCl₄ readily hydrolysed?
- Q6
Derive the Schrödinger wave equation and explain the terms used in it. Explain the significance of ψ and ψ².
- Q7
- (a)What are the limitations of Valence Bond theory? Explain the rules for linear combination of atomic orbitals in Molecular Orbital theory.
- (b)Draw molecular orbital diagram for O₂ and O₂⁺ molecules and calculate their bond order.
- (c)Draw molecular orbital diagram for heteronuclear CO molecule.
- Q8
Write short notes on the following:
- (a)Bonding in diborane (B₂H₆)
- (b)Silicates and their classification
- (c)Interhalogen compounds
- Q9
- (a)Explain the shape of XeOF₄, XeOF₂ and XeF₄.
- (b)Why is BeH₂ covalent and polyatomic but CaH₂ is ionic?
- (c)Differentiate between bonding molecular orbitals and antibonding molecular orbitals.
- Q10
- (a)Why is borazine also called inorganic benzene?
- (b)Discuss the inert pair effect. Define effective nuclear charge.
How to Practise This Paper
- Set aside 3 hours and attempt the paper exactly as per the printed instructions.
- Mark your answers against the syllabus and standard B.Sc. textbooks.
- Note the repeated topics across years — these are the most important for the upcoming LU exam.
Frequently Asked Questions
What is the paper code for the LU B.Sc. Chemistry Semester I 2023 paper?
The paper code is 31043. It is the First Paper — Inorganic Chemistry-I — of the B.Sc. Semester I (2023) examination of Lucknow University, held in the Regular / Improvement category.
How many questions are there in the LU B.Sc. Chemistry Semester I 2023 paper?
The paper contains multiple questions. Attempt any five questions. All questions carry equal marks (15 marks each; 5 marks per part where a question has three parts).
What is the marking scheme of the LU B.Sc. Chemistry Semester I 2023 paper?
The maximum marks for the paper are 75. Attempt any five questions. All questions carry equal marks (15 marks each; 5 marks per part where a question has three parts).
How much time is given for the LU B.Sc. Chemistry Semester I 2023 paper?
Candidates get 3 hours to complete the paper.
Is the LU B.Sc. Chemistry Semester I 2023 paper available for download?
The full question paper is available as a PDF on this page. You can view it directly in the browser or download it for offline practice. No sign-up is required.
Do I need to attempt all questions in the LU B.Sc. Chemistry paper 31043?
No. The printed instruction on the paper says: Attempt any five questions. All questions carry equal marks (15 marks each; 5 marks per part where a question has three parts). Choose the questions you are most confident about within the 3 hours time limit.