About This Solved Paper
| Prepared by | Unnati Education, IGNOU-experienced academic content team |
| Qualification | Graduate with specialization in Chemistry |
| Programme | IGNOU Bachelor of Science General (BSCG) and Bachelor of Science Multidisciplinary (BSCM) |
| Institution Reference | IGNOU Term-End Examination December 2025 |
If you are an IGNOU BSc student and BCHCT-137 is your upcoming paper, you are already a step ahead. This course combines coordination chemistry, states of matter, and chemical kinetics in one paper. The BCHCT 137 Question Paper December 2025 solution is now available. Studying the actual paper with expert-written answers removes guesswork completely. You know what was asked, how much to write, and exactly what IGNOU expects from your answers.
Download Now | Get BCHCT-137 Solved Question Paper December 2025 IGNOU
You can get the IGNOU BCHCT-137 question paper with complete solutions directly from our team. WhatsApp us your course details and we will send you the full BCHCT-137 December 2025 solved paper immediately.
What is BCHCT 137 Question Paper December 2025?
The BCHCT 137 December 2025 question paper is a 50-mark IGNOU Term-End Examination for BSc (BSCG/BSCM) students covering coordination chemistry and chemical kinetics, where students attempt 10 questions in 2 hours with descriptive and numerical answers.
BCHCT-137 sits within the IGNOU Bachelor of Science (General) and BSc Multidisciplinary programmes. Part A tests knowledge of transition elements, complex compounds, and bonding theories. Part B focuses on gas laws, surface chemistry, crystal structures, and reaction kinetics. Both sections demand a mix of conceptual understanding and calculation skills.
About IGNOU BCHCT-137 | Coordination Chemistry, States of Matter and Chemical Kinetics
BCHCT-137 builds understanding of how metal ions form coordination complexes, how gases and liquids behave under changing conditions, and how chemical reactions proceed at the molecular level. Topics span crystal field theory, valence bond theory, Maxwell-Boltzmann distribution, and integrated rate laws. It rewards students who practice both theory writing and numerical problem-solving equally. Most students find Part B more calculation-intensive, so giving it adequate time during preparation pays off well.
BCHCT 137 Exam Pattern and Marks Breakdown
This paper carries 50 marks total. Part A covers Coordination Chemistry and Part B covers States of Matter and Chemical Kinetics. Students must attempt any five questions from each part on separate answer sheets. All questions carry equal marks. The examination duration is 2 hours. Questions require both descriptive explanations and numerical calculations.
All Questions | BCHCT 137 Question Paper December 2025 IGNOU (Complete List)
Part A (Coordination Chemistry)
- (a) Explain the ground state electronic configuration of Sc+ ion. 2 (b) Complete and balance any two of the following reactions : 3 (i) Ti(s) + O2(g) → (ii) Cr(s) + O2(g) → (iii) Cu(s) + O2(g) →
- (a) (i) Which of the following ions is coloured ? Give reasons : 2 (1) Ti4+ (2) [Fe(H2O)6]3+ (ii) What is the unit of magnetic moment ? 1 (b) Name any two transition elements which are present in very small quantities in plants and animals and are essential for the enzymes to function ? 2
- (a) Which one of the following complexes does not have perfect octahedral geometry ? Justify your answer : 3 (i) [Cr(H2O)6]3+ (ii) [VCl6]2– (iii) [Fe(H2O)6]3+ (b) Calculate the spin-only magnetic moment for [Mn(H2O)6]2+ or CuCl. 2
- (a) Why is the size of the elements of third transition series almost similar to that of the elements of second transition series ? 3 (b) Determine the oxidation state and coordination number of the central metal ion in the following : 2 (i) [Ag(NH3)2]+ (ii) [Co(H2O)6]2+
- (a) Write the IUPAC name of any one of the following compounds : 2 (i) [(NH3)5 CoNH2 . Co(NH3)5] (NO3)5 (ii) [(CO)3 Fe(CO)3 Fe(CO)3] (b) Write down all possible isomers of [Co(NH3)5NO2]Cl2 and give their names. 3
- (a) Write the formula of the following : 2 (i) Tetrapyridineplatinum (II) Tetrachloridoplatinate (II) (ii) Pentaammineaquacobalt (III) chloride (b) Explain the structure and magnetic moments of the following complexes on the basis of valence bond theory : 3 [MnCl4]2– and [Mn(CN)6]3–
- (a) Calculate the crystal field stabilization energy of [Fe(CN)6]4– complex. 3 (b) What is spectrochemical series ? 2
Part B (States of Matter and Chemical Kinetics)
- (a) State Boyle's law and draw a graph between P and 1/V for an ideal gas. 2 (b) The density of a gas was found to be 3.43 g/L at 300 K and 1 atm. Calculate the molecular mass. 3
- (a) 2 mole of N2 and 3 mole of H2 gas are kept in a container. The total pressure is 10 atm. Find out the partial pressure of H2 and N2. 3 (b) What is most probable velocity (mp) ? Explain with graph of Maxwell-Boltzmann's distribution. 2
- (a) Why are bubbles of a gas spherical in nature ? 1 (b) What is the effect of temperature on surface tension ? 1 (c) The number of drops for a certain volume of water counted in a stalgamometer at 298 K is 300, whereas the number of drops for the same volume of ethyl alcohol is 320. Calculate the surface tension of ethyl alcohol. 3 Given that : The density of water = 0.998 kg dm–3 Density of ethyl alcohol = 0.9614 kg dm–3 Surface tension of water = 0.0727 Nm–1
- (a) Illustrate the formation of a tetrahedral void and an octahedral void. 3 (b) Calculate the number of formula units of NaCl present in a unit cell of NaCl. 2
- (a) Silver has a fcc lattice. The edge length of its unit cell is 4.077 × 10–8 cm and its density is 10.12 g/cm3. What is the molar mass of silver ? 3 (b) Give two differences between Schottky defect and Frenkel defect. 2
- (a) State law of constancy of interfacial angles. 1 (b) What are pseudo first order reactions ? Give an example. 2 (c) "Molecularity of a reaction rarely exceeds 3." Explain. 2
- (a) Derive the expression for integrated rate law for a zero-order reaction. 3 (b) Draw the following plots for a first order reaction : 2 (i) ln[R] vs. t (ii) log [R0]/[R] vs. t
BCHCT 137 Syllabus Topics Covered
The December 2025 paper covers coordination chemistry and transition element properties in Part A. Part B addresses gas laws and molecular speed distributions, surface tension and crystallography, and chemical kinetics including rate laws and reaction order. Students who have worked through all four topic blocks will find the paper well within reach.
Sample Answer Preview | BCHCT 137 Solved Question Paper
Take Question 7(b): What is spectrochemical series? A strong IGNOU answer defines it as the arrangement of ligands in order of increasing crystal field splitting energy. CN– and CO are strong field ligands causing large splitting, while Cl– and F– are weak field ligands. This arrangement explains the high-spin or low-spin nature of a complex. Get the complete BCHCT-137 solved question paper from Unnati Education for all 14 questions answered in this structured format.
How to Write High-Scoring Answers in BCHCT 137 Exam
Always show each step in numerical questions, with units at every stage. For theory questions like Boyle's law or valence bond theory, start with a clean definition and build from there. Diagrams matter in questions on crystal voids and kinetics graphs. IGNOU examiners reward clarity. Keep your answers structured: define, explain, and conclude.
Who Should Use This BCHCT-137 Solved Question Paper December 2025?
This resource works well for first-attempt BSCG and BSCM students building exam confidence. Repeat candidates benefit from seeing how structured answers differ from what they wrote before. Self-study students with no coaching access get exam-ready reference material based on the actual December 2025 paper. Chemistry learners who want topic-wise clarity on coordination complexes and kinetics will also find it genuinely useful.
Why This Is Better Than Free BCHCT-137 December 2025 Question Paper PDFs and Telegram Files
Free Telegram files and random PDFs usually carry scanned question papers with no solutions. Many have OCR errors or missing data. Unnati Education's BCHCT-137 December 2025 solved paper includes verified answers, stepwise numerical solutions, and IGNOU-aligned answer writing format. It is built for exam preparation, not just archiving. That gap becomes clear when you sit down to actually study.
Student Reviews | BCHCT-137 Solved Question Paper by Unnati Education
Priya Singh, BSCG Student: "I got the BCHCT-137 December 2025 solved paper from Unnati and it made a real difference. Kinetics answers were explained clearly."
Rahul Verma, IGNOU Delhi: "Coordination chemistry confused me for months. The BCHCT 137 solved paper from Unnati finally made CFSE and VBT click for me."
Sneha Kapoor, BSCM Student: "Numerical solutions were accurate and matched exactly what IGNOU expects. I would recommend this to every BCHCT-137 student."
How to Get the BCHCT-137 Solved Question Paper December 2025 | Step by Step
- WhatsApp Unnati Education and mention BCHCT-137 December 2025.
- Share your name and programme.
- Our team confirms your requirement and sends you the full solved paper digitally.
Frequently Asked Questions
What is BCHCT-137?
BCHCT-137 is a chemistry course in IGNOU's Bachelor of Science General (BSCG) and BSc Multidisciplinary (BSCM) programmes. Its full title is Coordination Chemistry, States of Matter and Chemical Kinetics. The paper carries 50 marks and covers transition element properties, complex compounds, gas laws, surface chemistry, crystal structures, and chemical reaction rates. Students need a clear understanding of both theory and numerical applications to perform well in this Term-End Examination.
What is the exam pattern and marks distribution for BCHCT 137 December 2025?
The BCHCT 137 December 2025 paper is divided into Part A on Coordination Chemistry and Part B on States of Matter and Chemical Kinetics. Each part contains seven questions. Students must attempt any five from each part. All attempted questions carry equal marks. The total is 50 marks and the exam duration is 2 hours. Both parts must be answered on separate answer sheets as per IGNOU's standard Term-End Examination instructions.
Which topics are most important in BCHCT-137 coordination chemistry and kinetics?
In Part A, focus on electronic configuration of transition metal ions, CFSE calculations, IUPAC nomenclature of coordination compounds, isomerism, and valence bond theory for complex structures. In Part B, key areas include Boyle's law, Dalton's partial pressure law, Maxwell-Boltzmann distribution, surface tension calculations using the stalgamometer formula, unit cell calculations, crystal defects, and integrated rate laws for zero and first order reactions. Numerical questions carry significant marks in both sections.
How can I download the IGNOU BCHCT-137 question paper for December 2025?
You can get the BCHCT-137 December 2025 question paper with full solutions directly from Unnati Education. Simply WhatsApp us with your programme details and we will send you the complete solved material. The IGNOU official website also publishes question papers after the examination cycle ends. For structured solved versions with verified answers and exam-ready format, Unnati Education is the most dependable option available for IGNOU BSc chemistry students preparing seriously.
About Unnati Education | IGNOU Study Material Experts
Unnati Education has been supporting IGNOU students across India with structured study material, solved question papers, and important questions for Term-End Examinations. Our chemistry resources are prepared by subject-experienced academic writers and checked for accuracy. We specialise in IGNOU BSCG and BSCM content. Students from Delhi, Uttar Pradesh, Rajasthan, and across India have relied on us for TEE preparation. We understand the IGNOU answer pattern well and design every resource around it.
Explore More IGNOU BCHCT-137 Solved Papers and Study Material
Explore BCHCT-137 Important Questions Booklet for the current session. Access BCHCT-137 Assignment Solutions prepared by Unnati Education. Find chapter-wise notes and study material for BCHCT-137. Browse IGNOU BSCG previous year solved question papers. s to respective pages]
Get Your BCHCT 137 Question Paper December 2025 Solved Paper Now
The BCHCT 137 Question Paper December 2025 with complete solutions is ready for you. Do not leave your exam preparation to chance when structured, expert-verified answers are available. WhatsApp Unnati Education today and we will send it to you right away.