MCH 013 Solved Question Paper for the June 2026 term-end exam gives M.Sc. Chemistry learners worked answers to every item of the official General Physical Chemistry paper. Our subject experts took the printed June 2026 paper, solved all 28 answerable parts in the length IGNOU examiners expect, and compared them with earlier MCH 013 papers so you can see which topics keep returning.
MCH 013 key facts for the June 2026 solved paper
- Course code: MCH 013 (printed on the paper as MCH-013)
- Subject: General Physical Chemistry
- Programme: M.Sc. (Chemistry) MSCCHEM and M.Sc. (Analytical Chemistry) MSCANCHEM, Semester I
- Credits: 4 (theory)
- Blocks and units: 4 blocks, 16 units
- Maximum marks: 50 in the term-end exam (assignment weightage 30%)
- Duration: 2 hours
- Questions in the paper: 7 questions with 28 answerable items
- Samples shown on this page: 2 (Question 3 d and Question 5 c)
- Questions in the paid file: All 28 items, of which 26 are not shown on this page
What the MCH 013 Solved Question Paper June 2026 covers
MCH 013 General Physical Chemistry is the 4 credit Semester I theory course of IGNOU's M.Sc. (Chemistry) and M.Sc. (Analytical Chemistry) programmes, and this file solves its June 2026 term-end paper in full.
The June 2026 paper was set for 50 marks and 2 hours. Its seven questions break down into 28 answerable items, and they draw on all four blocks: Gibbs and Helmholtz functions, solid state and crystal symmetry, enzyme and fast reaction kinetics, and Debye-Hückel theory with transport properties.
Numericals carry real weight this time. The paper asks for the ionic strength of a KCl and K2SO4 mixture, the moment of inertia of HI from its rotational temperature, the density of polonium from a primitive cubic cell, and the temperature at which oxygen matches the average speed of hydrogen at 20 K.
Derivations make up most of the rest: the Lindemann rate law by steady state approximation, the thermodynamic derivatives of A and G, the link between chemical potential and molar Gibbs energy, and the translational partition function of a particle in a one-dimensional box. Learners revising other courses can also browse our MSCCHEM Question Paper collection.
MCH 013 sample solved questions with full answers
Two MCH 013 answers are shown here in full: Question 3(d) on the density of polonium and Question 5(c) on the Lindemann rate law.
We picked one numerical and one derivation so you can judge both kinds of answer before you contact us. The question text is reproduced exactly as printed in the June 2026 paper, including its own spellings, and the marks shown are the ones IGNOU printed against each part.
Question 3 (d) (4 marks)
(d) Pollonium is assumed to crystallize in primitive cubic unit cell at room temperature. If a = 0.4 nm, calculate the theoretical density of pollonium. Molar mass of pollonium is 209 g mol–1. 4
Answer
The density of a cubic crystal comes from the mass of the atoms that belong to one unit cell divided by the volume of that cell.
ρ = (Z × M) / (NA × a3)
Here Z is the number of atoms per unit cell, M is the molar mass, NA is the Avogadro constant and a is the cell edge.
Step 1, atoms per cell. A primitive (simple) cubic cell has one atom at each of its 8 corners, and each corner atom is shared by 8 cells. So Z = 8 × 1/8 = 1.
Step 2, cell volume. a = 0.4 nm = 0.4 × 10−7 cm = 4.0 × 10−8 cm. Therefore a3 = (4.0 × 10−8 cm)3 = 64 × 10−24 cm3 = 6.4 × 10−23 cm3.
Step 3, mass in one cell. Z × M / NA = (1 × 209 g mol−1) / (6.022 × 1023 mol−1) = 3.471 × 10−22 g.
Step 4, density. ρ = (3.471 × 10−22 g) / (6.4 × 10−23 cm3) = 5.42 g cm−3, which is 5.42 × 103 kg m−3 in SI units.
Result: the theoretical density of polonium for the given cell is about 5.42 g cm−3.
Examiner note: alpha polonium is the only element known to adopt a simple cubic structure. Its measured cell edge is close to 0.336 nm, which gives a density near 9.2 g cm−3. The lower figure here comes from the rounded a = 0.4 nm in the question, so always answer from the data given and mention the assumption in one line.
Question 5 (c) (4 marks)
(c) Consider the following Lindemann mechanism for the unimolecular decomposition of a molecule A in the presence of a species M :
A + M ⇌ A* + M (forward k1, backward k–1)
A* → P (k2)
Using the steady state approximation, derive the rate law for the formation of the product. 4
Answer
In the Lindemann mechanism a molecule A gains energy by colliding with M and becomes an energised molecule A*. A* can either lose that energy in a second collision with M (rate constant k−1) or break down to the product P (rate constant k2).
Because A* is short lived, its concentration stays small and almost constant during the reaction. The steady state approximation therefore sets the net rate of change of [A*] equal to zero.
Step 1, rate of product formation. Only the second step gives P, so
d[P]/dt = k2[A*] (1)
Step 2, steady state for A*. A* forms in the forward collision step and is removed by deactivation and by decomposition:
d[A*]/dt = k1[A][M] − k−1[A*][M] − k2[A*] = 0 (2)
Step 3, solve for [A*].
[A*] = k1[A][M] / (k−1[M] + k2) (3)
Step 4, substitute (3) in (1). This gives the required rate law:
d[P]/dt = k1k2[A][M] / (k−1[M] + k2) (4)
Writing the rate as kuni[A], the effective unimolecular rate constant is kuni = k1k2[M] / (k−1[M] + k2). It depends on [M], which is why the observed order changes with pressure.
High pressure limit. When [M] is large, k−1[M] >> k2 and equation (4) becomes d[P]/dt = (k1k2/k−1)[A]. The reaction is first order, and decomposition of A* is the slow step.
Low pressure limit. When [M] is small, k2 >> k−1[M] and equation (4) becomes d[P]/dt = k1[A][M]. The reaction is second order overall, and activating collisions control the rate.
Taking reciprocals of kuni gives 1/kuni = k−1/(k1k2) + 1/(k1[M]). A plot of 1/kuni against 1/[M] should be a straight line, and this fall-off behaviour between the two limits is the main experimental test of the Lindemann mechanism.
Questions answered only in the full file
The 26 items below are printed exactly as they appear in the June 2026 paper. Their answers are in the full file only. In Question 4(a), m± stands for the mean ionic molality.
Question 1
1. Attempt any five questions from the following : 5×2=10
- (i) What is the salt effect in rate of reactions in solution ?
- (ii) What is the difference between isobaric and isothermal processes ?
- (iii) What are the amorphous materials ? Give any two examples.
- (iv) Describe the lock and key hypothesis of the enzyme action.
- (v) What is the relationship between molecular and canonical partition function ?
- (vi) State the law of constancy of interfacial angles.
- (vii) Define coefficient of viscosity of a gas and give the expression for the viscosity coefficient of a gas under laminar flow.
Question 2
- (a) What are the random variables ? Name their types. 1+1
- (b) Give the expression for rate constant as per Transition State Theory (TST) and name the terms involved. 1+1
- (c) Calculate the ionic strength of a solution which is 0.1 molal in KCl and 0.2 molal in K2SO4. 3
- (d) The rotational temperature for HI molecule in around 10 K. Calculate the moment of inertia for HI. 3
Question 3
- (a) Write the Michaelis-Menten equation for the following enzymatic reaction and define each term involved : E + S ⇌ ES → E + P (rate constants k1, k–1 and k2) 2
- (b) How does the total entropy of the universe change for reversible and irreversible processes in an isolated system ? 2
- (c) Define molar conductivity. How do we obtain the molar conductivity at infinite dilution ? 2
Question 4
- (a) Formulate the relationship between mean molality (m±) and m for following electrolytes : (i) NaCl (ii) Na2SO4 1+2
- (b) Show that in a binary mixture, when the chemical potential of component A decreases then the chemical potential of component B will increase, if the temperature and pressure are fixed. 3
- (c) Describe stoppered flow method in brief, giving a suitable schematic diagram for the same. 2+2
Question 5
- (a) Write the expression for adsorption isotherm in terms of equilibrium constant and discuss the variation of fraction of surface uncovered as a function of the concentration (or pressure) of the gaseous adsorbate. 3
- (b) Calculate the temperature at which the average velocity of oxygen equals that of hydrogen at 20 K. [Mass of O2 = 32 g/mol]. 3
Question 6
- (a) How do we determine the values of Rmax and Km from Lineweaver-Burk plot ? 2
- (b) Derive the following relations using appropriate expressions : (i) (∂A/∂T)V = –S or (∂A/∂V)T = –P (ii) (∂G/∂P)T = V or (∂G/∂T)P = –S 2+2
- (c) Show that the chemical potential of the pure substance is equal to the molar Gibbs energy of the pure substance. 4
- (c) Or Give the physical significance of any two of the following : (i) Chemical potential (ii) Partial molar volume (iii) Helmholtz energy (iv) Gibbs energy
Question 7
- (a) Write any two symmetry elements. Give the schoenflies notation for them. 2
- (b) What are the basic assumptions of Debye-Hückel theory ? Give the mathematical expression for the Debye-Hückel limiting law and name the terms involved. 3
- (c) Derive the translational partition function for a particle of mass m, confined into a one-dimensional box of length L, where the energy of the particle is given as : ∈n,trans = n2h2/8mL2 5
Note: in Question 4(a), m± stands for mean ionic molality. Some PDF copies of the paper show this symbol as m1 because of a text conversion error.
MCH 013 General Physical Chemistry block and unit syllabus
MCH 013 General Physical Chemistry runs across four blocks and 16 units, starting with Gibbs and Helmholtz functions in Unit 1 and ending with thermal and ionic conduction in Unit 16.
The topics in the table come from the official MSCCHEM programme guide, and the block titles match the course page on eGyanKosh. Each block holds four units, and the Block 1 unit titles follow the IGNOU Block 1 booklet.
| Block | Unit | Topics specific to the unit |
|---|---|---|
| Block 1 Thermodynamics and Statistical Thermodynamics | Unit 1 Gibbs and Helmholtz's Functions | Gibbs function as equilibrium criterion; temperature and pressure dependence of Gibbs energy; Helmholtz function |
| Unit 2 Systems of Variable Composition | Experimental partial molar volume; chemical potential and fugacity of gas mixtures; Gibbs-Duhem equation | |
| Unit 3 Introduction to Statistical Thermodynamics-I | Link between classical and statistical thermodynamics; probability, permutations and configurations; probability distribution functions | |
| Unit 4 Introduction to Statistical Thermodynamics-II | Boltzmann distribution function; canonical ensemble; translational, rotational, vibrational and electronic partition functions | |
| Block 2 Solid State and Reaction Rate Theories | Unit 5 Fundamentals of Solid State | Designation of lattice planes; X-ray diffraction and indexing; Curie and Curie-Weiss laws for magnetic solids |
| Unit 6 Crystal Symmetry | Symmetry elements versus symmetry operations; screw axis and glide plane; stereographic projections | |
| Unit 7 Collision and Transition State Theories | Limitations of collision theory; thermodynamic approach to transition state theory; statistical approach | |
| Unit 8 Theories of Unimolecular Reactions | Lindemann mechanism and its experimental test; Hinshelwood's theory; RRKM treatment | |
| Block 3 Kinetics and Catalysis | Unit 9 Kinetics of Reactions in Solution | Role of the solvent; theory of reaction rate in solution; primary and secondary salt effects |
| Unit 10 Kinetics of Fast Reactions | Continuous, accelerated and stopped flow; relaxation methods and shock tubes; flash and laser photolysis | |
| Unit 11 Catalysis | Langmuir and Gibbs adsorption isotherms; multilayer adsorption and BET equation; heterogeneous catalysis | |
| Unit 12 Kinetics of Enzyme Reactions | Michaelis-Menten mechanism and turnover number; Lineweaver-Burk plot; competitive and non-competitive inhibition | |
| Block 4 Electrochemistry and Transport Phenomenon | Unit 13 Debye Hückel Theory-I | Ionic cloud and Poisson's equation; activity and mean activity coefficient; postulates of Debye-Hückel theory |
| Unit 14 Debye Hückel Theory-II | Charge distribution around the central ion; success and limits of the theory; mean ionic activity coefficients | |
| Unit 15 Transport Phenomenon-I: Diffusion and Viscosity | Molecular speed distribution and mean free path; Fick's first law; coefficient of viscosity and osmosis | |
| Unit 16 Transport Phenomenon-II: Thermal and Electrical (ionic) Conduction | Thermal conductivity and mean free path; drift velocity; ionic mobility and conductance |
The June 2026 paper touched every block, but Block 1 alone offered 23 of the 60 marks in Questions 2 to 7. If you are working through the official blocks unit by unit, our MCH 013 Study Material follows the same order.
IGNOU MCH 013 Question Paper pattern and marks split
The IGNOU MCH 013 Question Paper is a 2 hour, 50 mark paper: Question 1 is compulsory with any five short parts, and you answer any four of Questions 2 to 7.
The cover page also prints the constants you need, so numericals are expected to use those exact values. Continuous assessment adds one tutor-marked assignment with a 30% weightage, and it must be submitted before you fill the exam form.
| Part of the paper | What you do | Marks |
|---|---|---|
| Question 1 | Attempt any five of the seven short parts, (i) to (vii) | 5 × 2 = 10 |
| Questions 2 to 7 | Attempt any four; each question is split into three or four parts | 4 × 10 = 40 |
| Question 6 (c) | Internal choice between a derivation and the significance of any two of four quantities | 4 within Question 6 |
| Cover page constants | kB, h, NA, R and the cm−1 to joule conversion | Use where required |
| Whole paper | Time allowed: 2 hours | 50 |
Looking at where those marks came from shows how the June 2026 paper leaned. The count below adds the marks printed against each part, by block, before you make your choices.
| Block | Marks on offer in Question 1 | Marks on offer in Questions 2 to 7 | Parts from this block |
|---|---|---|---|
| Block 1 Thermodynamics and Statistical Thermodynamics | 4 | 23 | 1(ii), 1(v), 2(a), 2(d), 3(b), 4(b), 6(b), 6(c), 7(c) |
| Block 2 Solid State and Reaction Rate Theories | 4 | 12 | 1(iii), 1(vi), 2(b), 3(d), 5(c), 7(a) |
| Block 3 Kinetics and Catalysis | 4 | 11 | 1(i), 1(iv), 3(a), 4(c), 5(a), 6(a) |
| Block 4 Electrochemistry and Transport Phenomenon | 2 | 14 | 1(vii), 2(c), 3(c), 4(a), 5(b), 7(b) |
The paper follows the same layout as the December 2024, June 2025 and December 2025 papers, so practising with an IGNOU Previous Year Question Paper set gets you used to the timing.
Most repeated MCH 013 topics across four IGNOU papers
Ten of twelve MCH 013 topic groups appeared in all four official papers we could read, December 2024 to June 2026, so these units deserve the most revision time.
We used the papers published on ignou.ac.in for December 2024, June 2025, December 2025 and June 2026. The course started in January 2024, so June 2024 would be its first exam; that file on ignou.ac.in returned no readable text and is not counted here.
| Topic (unit) | Where it was asked | Recurring question type | Sessions out of 4 |
|---|---|---|---|
| Lindemann and Hinshelwood unimolecular theory (Unit 8) | Dec 2024 Q6(a); Jun 2025 Q1(iv), Q5(a); Dec 2025 Q1(ii), Q2(c); Jun 2026 Q5(c) | Steps of the mechanism and the high pressure rate step | 4 |
| Michaelis-Menten kinetics and enzyme action (Unit 12) | Dec 2024 Q1(v), Q4(b), Q5(b); Jun 2025 Q1(iii), Q5(d), Q6(a); Dec 2025 Q5(a); Jun 2026 Q1(iv), Q3(a), Q6(a) | Order change with substrate level and Lineweaver-Burk reading | 4 |
| Debye-Hückel theory, ionic strength and activity (Units 13 and 14) | Dec 2024 Q4(c), Q5(a); Jun 2025 Q1(ii), Q2(c), Q6(c); Dec 2025 Q1(iv), Q4(c), Q7(a); Jun 2026 Q2(c), Q4(a), Q7(b) | Ionic strength numericals and limits of the law | 4 |
| Partition functions, Stirling approximation and microstates (Units 3 and 4) | Dec 2024 Q2(c), Q3(d); Jun 2025 Q1(vii), Q2(d), Q5(c), Q7(b); Dec 2025 Q1(i), Q3(c), Q4(b), Q7(c); Jun 2026 Q1(v), Q2(d), Q7(c) | Translational partition function in a 1-D box, asked word for word twice | 4 |
| Fast reaction methods (Unit 10) | Dec 2024 Q2(d); Jun 2025 Q1(i), Q3(b), Q5(b); Dec 2025 Q1(iii), Q3(d); Jun 2026 Q4(c) | Stopped flow method and relaxation time numericals | 4 |
| Solid state: Miller indices, density, voids and magnetic laws (Units 5 and 6) | Dec 2024 Q3(a), Q6(b); Jun 2025 Q1(v), Q4(c), Q6(d); Dec 2025 Q1(vi), Q3(b), Q6(a), Q6(b); Jun 2026 Q1(iii), Q1(vi), Q3(d), Q7(a) | Cubic cell density with a = 0.4 nm, set in June 2025 and June 2026 | 4 |
| Gibbs and Helmholtz functions and spontaneity (Unit 1) | Dec 2024 Q6(c), Q7(a); Jun 2025 Q3(c), Q7(a); Dec 2025 Q2(b), Q7(b); Jun 2026 Q3(b), Q6(b) | Maxwell type derivations and spontaneity at a given temperature | 4 |
| Chemical potential and partial molar quantities (Unit 2) | Dec 2024 Q1(i), Q4(a); Jun 2025 Q4(a); Dec 2025 Q2(d); Jun 2026 Q4(b), Q6(c) | Gibbs-Duhem reasoning in a binary mixture | 4 |
| Transport: viscosity, diffusion, mean free path and molecular speeds (Units 15 and 16) | Dec 2024 Q1(vi), Q2(b), Q3(b), Q3(c); Jun 2025 Q1(viii), Q2(a), Q3(a), Q4(b); Dec 2025 Q1(v), Q1(vii), Q3(a), Q4(a), Q5(b); Jun 2026 Q1(vii), Q3(c), Q5(b) | Flux, Fick's laws and speed of gas molecules | 4 |
| Adsorption and catalysis (Unit 11) | Dec 2024 Q1(vii), Q2(a); Jun 2025 Q2(b), Q6(b); Dec 2025 Q2(a), Q5(c); Jun 2026 Q5(a) | Energy profile of catalysed reactions and surface coverage | 4 |
| Salt effect and Bronsted-Bjerrum plots (Unit 9) | Dec 2024 Q1(iv), Q7(b); Dec 2025 Q6(c); Jun 2026 Q1(i) | Predicting the slope of log k against ionic strength | 3 |
| Collision and transition state theory (Unit 7) | Dec 2024 Q1(ii), Q5(c); Jun 2025 Q4(d); Jun 2026 Q2(b) | Activation energy and the TST rate expression | 3 |
The clearest signal is Question 7(c): the June 2025 paper asked the same one-dimensional translational partition function derivation for 5 marks. For a shorter revision list built on these patterns, see our IGNOU Important Questions page.
How our MCH 013 physical chemistry answers are written and checked
Every MCH 013 answer is written from the IGNOU self learning material, sized to the marks printed against it, and checked a second time for units and arithmetic.
Two mark short parts in Question 1 get a definition plus one supporting line or equation, which is what a 2 mark slot can hold in a 2 hour paper. Three and four mark parts get a short lead-in, the working, and a one line result.
Numericals use only the constants printed on the June 2026 cover: kB = 1.38 × 10−23 J K−1, h = 6.626 × 10−34 J s, NA = 6.022 × 1023 mol−1 and R = 8.314 J K−1 mol−1. Unit conversions sit on their own line so an examiner can award step marks.
Derivations carry numbered equations, as in the Lindemann answer above, and state their assumptions before the algebra starts. Where a sketch earns marks, such as the stopped flow set-up in Question 4(c), the file includes a labelled schematic diagram.
The answers were drafted by our physical chemistry team led by Prateek Talwar and reviewed by Sheetal Kirola. Before release, a second person recalculated every number and matched each answer to its unit in the table further down this page.
MCH 013 solved file index for June 2026
The MCH 013 June 2026 file holds 28 solved items: 2 are shown on this page and 26 are in the full file only.
MCH 013 is a theory course, so this index replaces a practical file list. It maps every item in the paper to the course unit it comes from, which helps you plan revision even before you open the answers.
| Item | Topic | Course unit | Where to find it |
|---|---|---|---|
| Q1 (i) | Salt effect on reaction rate | Unit 9 Kinetics of Reactions in Solution | Full file only |
| Q1 (ii) | Isobaric versus isothermal process | Unit 1 Gibbs and Helmholtz's Functions | Full file only |
| Q1 (iii) | Amorphous solids | Unit 5 Fundamentals of Solid State | Full file only |
| Q1 (iv) | Lock and key model | Unit 12 Kinetics of Enzyme Reactions | Full file only |
| Q1 (v) | Molecular and canonical partition function | Unit 4 Introduction to Statistical Thermodynamics-II | Full file only |
| Q1 (vi) | Constancy of interfacial angles | Unit 6 Crystal Symmetry | Full file only |
| Q1 (vii) | Viscosity coefficient of a gas | Unit 15 Transport Phenomenon-I | Full file only |
| Q2 (a) | Random variables | Unit 3 Introduction to Statistical Thermodynamics-I | Full file only |
| Q2 (b) | TST rate constant | Unit 7 Collision and Transition State Theories | Full file only |
| Q2 (c) | Ionic strength numerical | Unit 13 Debye Hückel Theory-I | Full file only |
| Q2 (d) | Moment of inertia from rotational temperature | Unit 4 Introduction to Statistical Thermodynamics-II | Full file only |
| Q3 (a) | Michaelis-Menten equation | Unit 12 Kinetics of Enzyme Reactions | Full file only |
| Q3 (b) | Entropy of the universe | Unit 1 Gibbs and Helmholtz's Functions | Full file only |
| Q3 (c) | Molar conductivity at infinite dilution | Unit 16 Transport Phenomenon-II | Full file only |
| Q3 (d) | Density of polonium (primitive cubic) | Unit 5 Fundamentals of Solid State | On this page |
| Q4 (a) | Mean molality of NaCl and Na2SO4 | Unit 14 Debye Hückel Theory-II | Full file only |
| Q4 (b) | Gibbs-Duhem in a binary mixture | Unit 2 Systems of Variable Composition | Full file only |
| Q4 (c) | Stopped flow method with diagram | Unit 10 Kinetics of Fast Reactions | Full file only |
| Q5 (a) | Langmuir isotherm and uncovered surface | Unit 11 Catalysis | Full file only |
| Q5 (b) | Average speed of O2 and H2 | Unit 15 Transport Phenomenon-I | Full file only |
| Q5 (c) | Lindemann rate law by steady state | Unit 8 Theories of Unimolecular Reactions | On this page |
| Q6 (a) | Rmax and Km from Lineweaver-Burk plot | Unit 12 Kinetics of Enzyme Reactions | Full file only |
| Q6 (b) | Derivatives of A and G | Unit 1 Gibbs and Helmholtz's Functions | Full file only |
| Q6 (c) | Chemical potential equals molar Gibbs energy | Unit 2 Systems of Variable Composition | Full file only |
| Q6 (c) Or | Physical significance of thermodynamic quantities | Units 1 and 2 | Full file only |
| Q7 (a) | Symmetry elements and Schoenflies notation | Unit 6 Crystal Symmetry | Full file only |
| Q7 (b) | Debye-Hückel assumptions and limiting law | Unit 13 Debye Hückel Theory-I | Full file only |
| Q7 (c) | 1-D translational partition function | Unit 4 Introduction to Statistical Thermodynamics-II | Full file only |
Programmes that include MCH 013 General Physical Chemistry
MCH 013 General Physical Chemistry is a Semester I core course in two IGNOU School of Sciences programmes, MSCCHEM and MSCANCHEM, and both sit the same printed paper.
In the Master of Science (Chemistry) programme, MCH 013 carries 4 credits in Semester I alongside MCH 011 Inorganic Chemistry-I, MCH 012 Stereochemistry and Reactive Intermediates and three lab courses. The programme totals 80 credits and was launched for the January 2024 session.
The M.Sc. (Analytical Chemistry) programme, also launched for January 2024, lists the same course with the same 4 credits in its first semester. That is why the June 2026 paper header names both MSCCHEM and MSCANCHEM.
The theory here feeds directly into MCHL 013 Chemistry Lab-III, whose experiments include partial molar volumes of NaCl solutions, the mean activity coefficient of hydrochloric acid, Gibbs adsorption on charcoal and a Debye-Hückel-Onsager check by conductivity.
How to get the full MCH 013 Solved Question Paper on WhatsApp
Send "MCH 013 June 2026" to WhatsApp 9899436384 to get the full file with all 28 solved items.
The file contains the 2 answers shown above plus the 26 that are listed on this page as question text only. Numericals are worked step by step with units, derivations carry numbered equations, and each answer is tagged with its course unit and the earlier sessions where the topic appeared.
- Message WhatsApp 9899436384 with the course code MCH 013 and the session June 2026.
- Our team confirms the file and shares the price and payment details.
- Once payment is confirmed, the complete PDF is sent to the same WhatsApp chat.
If you also write MCH 011 or MCH 012 this term, mention those codes in the same message and we will tell you which solved papers are ready for June 2026. Our IGNOU MCH 013 Solved Question Paper is prepared for one session at a time, so check the session before you pay.
MCH 013 General Physical Chemistry FAQs
These MCH 013 answers cover the questions students ask us most about the June 2026 solved file.
What does the MCH 013 Solved Question Paper for June 2026 include?
It includes worked answers to all 28 answerable items of the June 2026 MCH 013 General Physical Chemistry paper, from the seven short parts of Question 1 to the partition function derivation in Question 7(c). Two answers, Question 3(d) and Question 5(c), are shown on this page. The other 26 sit only in the full file, which you get by messaging WhatsApp 9899436384.
How do I get the full MCH 013 solved file on WhatsApp?
Send a message to WhatsApp 9899436384 with the course code MCH 013 and the session June 2026. Our team replies with the price and payment details, and the complete PDF is shared once payment is confirmed. The file carries all 28 solved items, including the 26 that are not shown on this page, with every numerical worked step by step.
Is MCH 013 General Physical Chemistry a 4 credit course?
Yes. IGNOU lists MCH 013 General Physical Chemistry as a 4 credit theory course in Semester I of the M.Sc. (Chemistry) programme, which works out to about 120 study hours. The same course sits in the M.Sc. (Analytical Chemistry) structure too. Its material runs across four blocks and 16 units covering thermodynamics, solid state, kinetics, electrochemistry and transport.
What is the MCH 013 term-end exam pattern?
The MCH 013 paper is 2 hours long and carries 50 marks. Question 1 is compulsory and asks you to attempt any five of its short parts at 2 marks each. You then pick any four of Questions 2 to 7, each worth 10 marks and split into parts of 1 to 5 marks. Constants such as h, kB, NA and R are printed on the cover page.
Which MCH 013 topics repeat most often?
Across the four MCH 013 papers we checked, from December 2024 to June 2026, every session carried questions on Lindemann type unimolecular reactions, Michaelis-Menten kinetics, Debye-Hückel theory, partition functions and fast reaction methods. The derivation of the one-dimensional translational partition function appeared in both June 2025 and June 2026, so regular derivation practice pays off well in this course.
Are the MCH 013 numericals solved with units and steps?
Yes. Every MCH 013 numerical in the full file starts from the formula, converts units in a separate line, substitutes the constants printed on the paper and states the final answer with its unit. You can see the method in the polonium density answer above, where the cell edge moves from nanometres to centimetres before the density is worked out and rounded.
Who prepared and reviewed the MCH 013 answers?
The MCH 013 answers were written by our physical chemistry subject team led by Prateek Talwar and reviewed by Sheetal Kirola. Each answer was matched to the MCH 013 study units on eGyanKosh, checked against the marks printed on the paper, and every numerical was recalculated by a second person before the file was finalised for the June 2026 session.
Does the MCH 013 solved file help for the December 2026 exam?
It helps because MCH 013 papers keep returning to the same core units. The June 2026 file covers solid state density, Lindemann kinetics, Michaelis-Menten, Debye-Hückel theory and statistical thermodynamics, all of which also appeared in earlier sessions. It is not a guess paper for December 2026, but these 28 answers give you tested models for question types that recur.