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Test series · Mains

Chemistry Mains answer writing

One test series for the three UPSC exams with a descriptive chemistry paper: Civil Services (Chemistry optional), Indian Forest Service and Combined Geo-Scientist. Write each test by hand like the real exam, upload your copy, read the model answers at once, and get your copy back checked by VKC with marks and comments.

Chemistry optional

Civil Services Mains

Paper I and Paper II · 250 marks each · 3 hours each

14 tests planned · 14 live

Chemistry

Indian Forest Service Mains

Paper I and Paper II · 200 marks each · 3 hours each

12 tests planned · 12 live

Chemist stream

Combined Geo-Scientist Mains

Paper I Inorganic, Paper II Physical, Paper III Analytical and organic · 200 marks each · 3 hours each

19 tests planned · 19 live

How it works

  1. Download the question paper and the answer booklet (UPSC layout: each question with its writing space) after signing in with Google.
  2. Write it by hand in the exam time, on A4 sheets or a notebook, the way you will in the hall.
  3. Upload the pages you wrote on, as one scanned PDF or as photos. The test page shrinks them and leaves out blank pages for you.
  4. Read the model answers, which open the moment your copy is uploaded.
  5. Get your copy back checked: marks for every answer and comments on what to add, cut or draw to score more.

Civil Services Mains Chemistry optional

Paper I and Paper II · 250 marks each · 3 hours each · Syllabus and past papers

Fee for Civil Services

Civil Services series

14 tests 8 sectional + 6 full-length · first test free · 13 paid × ₹500

Fee ₹6,500

What you get

You get

  • All 14 Civil Services tests: 8 sectionals (S1–S8) and 6 full-length mocks (C1–C6); S1 is free for everyone
  • Question paper and UPSC-style answer booklet of every test (PDF)
  • Model answers of a test, opened as soon as you upload your own copy of it
  • Your copy checked by VKC, returned with marks and comments on every answer
  • All VKC Basic study material (notes, short notes, solved PYQs, handbook, daily answer archive) until your Mains
  • Valid till the Civil Services Mains 2027

Not included

  • IFoS and Geo-Scientist tests (the CS + IFoS combined series adds IFoS for ₹4,500 more)
  • Prelims tests
Enrol

14 tests planned · 14 live

CodeTest and syllabus coveredPatternStatus
Sectional tests, common to Civil Services and IFoS 8 tests
S1 Atomic structure, chemical bonding, solid statePaper I · Uncertainty principle, Schrödinger equation, particle in a box, H-atom wave functions, orbitals; ionic bond, lattice energy, Born–Haber, dipole moments, VB and MO theory; crystal systems, Bragg's law, radius ratio, NaCl, ZnS, CsCl, CaF₂ (IFoS: CdI₂, rutile, liquid crystals), defects, semiconductors 150 marks1 h 45 min4 questions, Q1 + any 2Free for all · open
S2 Gases, liquids, thermodynamics, phase equilibriaPaper I · Real gases, critical phenomena, Maxwell distribution, collisions, effusion, transport; Kelvin equation, surface tension; first, second and third laws, Maxwell relations, J–T effect, equilibrium (IFoS: statistical thermodynamics); Clausius–Clapeyron, phase diagrams, CST, partial molar and excess functions 150 marks1 h 45 min4 questions, Q1 + any 2Live
S3 Electrochemistry, kinetics, photochemistry, surfacesPaper I · Debye–Hückel, cells, EMF, fuel cells, double layer, overpotential, electroanalytical methods (IFoS: polarography, CV); rate laws, complex reactions, chain reactions, fast reactions, collision and transition-state theories; H₂–halogen photochemistry; Langmuir, BET, heterogeneous catalysis 150 marks1 h 45 min4 questions, Q1 + any 2Live
S4 Coordination, bio-inorganic, main group, f-blockPaper I · VBT, CFT, magnetism and spectra, isomerism, trans effect, stability, carbonyls, nitrosyls, organometallics, clusters; ion transport, O₂-binding proteins, cytochromes, ferredoxins; boranes, borazines, phosphazenes, silicates, interhalogens, S–N and noble gas compounds; lanthanides and actinides (IFoS: non-aqueous solvents) 150 marks1 h 45 min4 questions, Q1 + any 2Live
S5 Aromaticity, mechanisms, intermediates, substitution, elimination, additionPaper II · Aromaticity, annulenes, azulenes, tropolones, fulvenes, sydnones; methods of studying mechanism, kinetic vs thermodynamic control; carbocations, carbanions, radicals, carbenes, benzynes, nitrenes; SN1, SN2, SNi, NGP, aromatic and heterocyclic substitution; E1, E2, E1cb, pyrolytic eliminations; additions to C=C, C≡C, C=O 150 marks1 h 45 min4 questions, Q1 + any 2Live
S6 Rearrangements, named reactions, pericyclicPaper II · Pinacol, Hofmann, Beckmann, Baeyer–Villiger, Favorskii, Fries, Claisen, Cope, Stevens, Wagner–Meerwein; aldol to Reformatsky named reactions and syntheses; electrocyclic, cycloaddition and sigmatropic reactions, Woodward–Hoffmann rules, FMO approach 150 marks1 h 45 min4 questions, Q1 + any 2Live
S7 Polymers, biopolymers, reagents, photochemistryPaper II · Polyethylene to rubber (IFoS: molecular weights, polymer solutions, inorganic polymers); proteins, DNA, RNA; OsO₄, HIO₄, CrO₃, Pb(OAc)₄, SeO₂, NBS, B₂H₆, Na/NH₃, LiAlH₄, NaBH₄, n-BuLi, MCPBA; excited states, Norrish I and II 150 marks1 h 45 min4 questions, Q1 + any 2Live
S8 SpectroscopyPaper II · Rotational, vibrational and electronic spectra, Woodward–Fieser rules, ¹H NMR, mass spectrometry, McLafferty rearrangement (IFoS: ESR) 150 marks1 h 45 min4 questions, Q1 + any 2Live
Full-length tests in this exam's pattern 6 tests
C1 Civil Services Paper I, Mock 1Paper I · Whole Paper I syllabus in the UPSC pattern 250 marks3 h8 questions, attempt 5Live
C2 Civil Services Paper I, Mock 2Paper I · Whole Paper I syllabus in the UPSC pattern 250 marks3 h8 questions, attempt 5Live
C3 Civil Services Paper I, Mock 3Paper I · Whole Paper I syllabus in the UPSC pattern 250 marks3 h8 questions, attempt 5Live
C4 Civil Services Paper II, Mock 1Paper II · Whole Paper II syllabus in the UPSC pattern 250 marks3 h8 questions, attempt 5Live
C5 Civil Services Paper II, Mock 2Paper II · Whole Paper II syllabus in the UPSC pattern 250 marks3 h8 questions, attempt 5Live
C6 Civil Services Paper II, Mock 3Paper II · Whole Paper II syllabus in the UPSC pattern 250 marks3 h8 questions, attempt 5Live

Indian Forest Service Mains Chemistry

Paper I and Paper II · 200 marks each · 3 hours each · Syllabus and past papers

Fee for IFoS

IFoS series

12 tests 8 sectional + 4 full-length · first test free · 11 paid × ₹500

Fee ₹5,500

What you get

You get

  • All 12 IFoS tests: 8 IFoS sectionals (I1–I8) and 4 full-length mocks (F1–F4); I1 is free for everyone
  • Question paper and UPSC-style answer booklet of every test (PDF)
  • Model answers of a test, opened as soon as you upload your own copy of it
  • Your copy checked by VKC, returned with marks and comments on every answer
  • All VKC Basic study material (notes, short notes, solved PYQs, handbook, daily answer archive) until your Mains
  • Valid till the IFoS Mains 2027

Not included

  • Civil Services and Geo-Scientist tests (the CS + IFoS combined series adds Civil Services for ₹5,500 more)
  • Prelims tests
Enrol

12 tests planned · 12 live

CodeTest and syllabus coveredPatternStatus
Sectional tests, common to Civil Services and IFoS 8 tests
I1 Atomic structure, chemical bonding, solid statePaper I · Quantum chemistry, H-atom, orbitals; ionic and covalent bonding, VB and MO theory; crystal systems, Bragg's law, radius ratio, CdI₂, rutile, liquid crystals, defects, semiconductors 150 marks1 h 45 min4 questions, Q1 + any 2Free for all · open
I2 Gaseous state, thermodynamics, statistical thermodynamics, phase equilibriaPaper I · Real gases, intermolecular forces, liquefaction, kinetic theory, collisions and effusion; laws of thermodynamics, calorimetry, statistical thermodynamics and partition functions; phase rule and phase diagrams, solutions 150 marks1 h 45 min4 questions, Q1 + any 2Live
I3 Electrochemistry, kinetics, photochemistry, surfacesPaper I · Electrolytes, cells, polarography and cyclic voltammetry; rate laws, complex and fast reactions, theories of rates; photochemistry; adsorption and catalysis 150 marks1 h 45 min4 questions, Q1 + any 2Live
I4 Coordination, organometallics, bio-inorganic, f-block, non-aqueous solventsPaper I · Bonding, magnetism and spectra of complexes, isomerism, substitution kinetics, carbonyls, nitrosyls, organometallics and clusters; ion transport, photosynthesis, nitrogen fixation, O₂ carriers; lanthanides and actinides; liquid NH₃, HF, SO₂, H₂SO₄ and superacids 150 marks1 h 45 min4 questions, Q1 + any 2Live
I5 Aromaticity, mechanisms, intermediates, substitution, elimination, additionPaper II · Aromaticity; reaction mechanisms and intermediates; substitution, elimination and addition reactions 150 marks1 h 45 min4 questions, Q1 + any 2Live
I6 Rearrangements, named reactions, pericyclicPaper II · Molecular rearrangements, named reactions and syntheses, pericyclic reactions and Woodward–Hoffmann rules 150 marks1 h 45 min4 questions, Q1 + any 2Live
I7 Polymers, biopolymers, reagents, photochemistryPaper II · Polymers, molecular weights, inorganic polymers; proteins and nucleic acids; synthetic reagents; organic photochemistry 150 marks1 h 45 min4 questions, Q1 + any 2Live
I8 SpectroscopyPaper II · Rotational, vibrational, electronic, NMR, ESR and mass spectra; structure determination 150 marks1 h 45 min4 questions, Q1 + any 2Live
Full-length tests in this exam's pattern 4 tests
F1 IFoS Paper I, Mock 1Paper I · Whole IFoS Paper I syllabus in the UPSC pattern 200 marks3 h8 questions, attempt 5Live
F2 IFoS Paper I, Mock 2Paper I · Whole IFoS Paper I syllabus in the UPSC pattern 200 marks3 h8 questions, attempt 5Live
F3 IFoS Paper II, Mock 1Paper II · Whole IFoS Paper II syllabus in the UPSC pattern 200 marks3 h8 questions, attempt 5Live
F4 IFoS Paper II, Mock 2Paper II · Whole IFoS Paper II syllabus in the UPSC pattern 200 marks3 h8 questions, attempt 5Live

Combined Geo-Scientist Mains Chemist stream

Paper I Inorganic, Paper II Physical, Paper III Analytical and organic · 200 marks each · 3 hours each · Syllabus and past papers

Fee for Geo-Scientist

Complete series

19 tests 13 sectional + 6 full-length · first test free · 18 paid × ₹500

Fee ₹8,999

What you get

You get

  • All 19 Geo-Scientist tests: 13 sectionals (G1–G13) and 6 full-length mocks (GM1–GM6); G1 is free for everyone
  • Question paper and UPSC-style answer booklet of every test (PDF)
  • Model answers of a test, opened as soon as you upload your own copy of it
  • Your copy checked by VKC, returned with marks and comments on every answer
  • All VKC Basic study material (notes, short notes, solved PYQs, handbook, daily answer archive) until your Mains
  • Valid till the Geo-Scientist Mains 2027

Not included

  • Civil Services and IFoS tests
  • Prelims tests (sold separately)
Enrol

VKC Plus · 10 tests

any 10 of 18 paid tests checked papers of all 19 tests open

Fee ₹4,999

What you get

You get

  • Question papers and answer booklets of all 19 Geo-Scientist tests, so you choose which to write
  • Any 10 tests of your choice checked by VKC (counted as you upload copies), with model answers for those tests
  • All VKC Basic study material until your Mains
  • Valid till the Geo-Scientist Mains 2027

Not included

  • Checking beyond 10 tests: add the remaining 8 later for ₹4,000 (total ₹8,999, same as the complete series)
  • Civil Services and IFoS tests
  • Prelims tests
Enrol

19 tests planned · 19 live

CodeTest and syllabus coveredPatternStatus
Sectional tests, unit by unit across Papers I, II and III 13 tests
G1 Inorganic solids, d- and f-block elementsPaper I · Defects, non-stoichiometry, solid electrolytes, 3d monoxides, corundum, ReO₃, spinel, perovskite, silicates and zeolites, intercalation, semiconductors; 3d/4d/5d comparison, lanthanide contraction, Ln magnetism and spectra, ion-exchange separation 120 marks1 h 45 minQ1 + any 3 of 4Free for all · open
G2 Coordination compounds and organometallicsPaper I · cis/trans by chemical methods, labile and inert, square-planar substitution, trans effect, stability constants; CFT, CFSE, Jahn–Teller, sigma and pi bonding, magnetic moments, term symbols, selection rules, spectrochemical series, charge transfer; 18-electron rule, carbonyls, M–M bonds, clusters, Wilkinson's catalyst 120 marks1 h 45 minQ1 + any 3 of 4Live
G3 Acid–base titrations, gravimetry, nuclear chemistryPaper I · Titration curves, polyprotic acids, indicators, carbonate–bicarbonate mixtures; solubility, hydrolysis, precipitate formation, co- and post-precipitation, PFHS, AgCl, BaSO₄, Al oxinate, Ni–DMG; decay kinetics, parent–daughter equilibria, nuclear stability, GM and solid-state detectors 120 marks1 h 45 minQ1 + any 3 of 4Live
G4 Redox and complexometric titrationsPaper I · Nernst equation, effect of complexation, precipitation and pH, equivalence potential, redox indicators, iodometry and iodimetry, permanganometry, dichrometry, Fe, Cu, Mn, Cr; EDTA equilibria, conditional constants, titration curves, metal indicators, back and displacement titrations, masking, hardness, antacids, Liebig and Hg²⁺ titrations 120 marks1 h 45 minQ1 + any 3 of 4Live
G5 Gaseous state, solids, quantum chemistryPaper II · Real gases, compressibility factor, van der Waals, critical constants, corresponding states, virial coefficient, Boyle temperature; band theory, crystal systems, Bravais lattices, Miller indices, symmetry, Bragg's law; operators, eigenvalues, uncertainty, expectation values, particle in 1-D and 3-D boxes, degeneracy 120 marks1 h 45 minQ1 + 4 of 6 + 2 of 3Live
G6 Thermodynamics, equilibrium, electrochemistryPaper II · Chemical potential, Gibbs–Duhem, fugacity, reaction isotherm, Kp, Kc, Kx, van't Hoff isobar and isochore, activity, Debye–Hückel limiting law; cells, Nernst equation, cell thermodynamics, electrodes, concentration cells, Ksp and pH from emf, potentiometric titrations and pKa 120 marks1 h 45 minQ1 + 4 of 6 + 2 of 3Live
G7 Kinetics, surfaces and colloids, photochemistryPaper II · Second-order, parallel and consecutive reactions, Arrhenius, collision and transition-state theory, ionic strength, isotope effect; Freundlich, Langmuir, BET, colloids, double layer, micelles; Franck–Condon, Jablonski, quantum yield, actinometry, HI, H₂–Br₂ and anthracene kinetics 120 marks1 h 45 minQ1 + 4 of 6 + 2 of 3Live
G8 SpectroscopyPaper II · Units and resonance condition, hydrogen spectrum, rigid rotor, bond length and isotope effect, harmonic and anharmonic oscillator, overtones, normal modes, Raman effect and selection rules, rotational and vibrational Raman spectra 120 marks1 h 45 minQ1 + 4 of 6 + 2 of 3Live
G9 Errors in analysis and separation methodsPaper III · Accuracy, precision, significant figures, Q-, t- and F-tests, control charts, sampling, reference materials; partition, adsorption and ion-exchange chromatography, plate theory, HETP and van Deemter, normal and reversed phase, TLC, HPLC, GLC; solvent extraction, distribution ratio, chelate extraction of metal ions 120 marks1 h 45 minQ1 + any 3 of 4Live
G10 Spectroscopic, X-ray and ICP methodsPaper III · Beer–Lambert law, UV-vis instrumentation, Job's and mole-ratio methods, IR instrumentation and sampling; flame AAS and AES, HCL and EDL, flame, VG and GF-AAS, background correction, interferences; X-ray generation, XRD, XRF, powder method; ICP-MS plasma, cones, ion lens, quadrupole, detectors, interferences 120 marks1 h 45 minQ1 + any 3 of 4Live
G11 Thermal methods and analysis of geological materialsPaper III · Thermogravimetry, Ca and Mg compounds; dolomite, bauxite, pyrolusite; brass, bronze, steel, type metal; petroleum fractions and tests (aniline, cloud and pour points, Doctor test, acid number, ash, lead); coal and coke, proximate and ultimate analysis, bomb calorimetry 120 marks1 h 45 minQ1 + any 3 of 4Live
G12 Intermediates, addition and carbonyl reactionsPaper III · Carbenes and nitrenes, Reimer–Tiemann, Hofmann, Curtius, Lossen, Schmidt; electrophilic, nucleophilic and radical additions, Ziegler–Natta, polyurethane, conducting polymers, Diels–Alder, additions to C=O; Cannizzaro, aldol, Perkin, Claisen, benzoin, benzilic acid, Mannich, Dieckmann, Michael, Stobbe, Darzens, Wittig, Knoevenagel, Reformatsky 120 marks1 h 45 minQ1 + any 3 of 4Live
G13 Redox reactions, pericyclic reactions, organic spectroscopyPaper III · Reduction of C=C, MPV, Wolff–Kishner, Birch; hydroboration, hydroxylation, ozonolysis, epoxidation, Sharpless; FMO and Woodward–Hoffmann, electrocyclic, cycloaddition, sigmatropic, Claisen, Cope, Sommelet–Hauser, Norrish I and II; IR, UV and Woodward rules, 1H and 13C NMR, mass spectrometry, McLafferty 120 marks1 h 45 minQ1 + any 3 of 4Live
Full-length tests in this exam's pattern 6 tests
GM1 Geo-Scientist Paper I, Mock 1Paper I · Whole Paper I (inorganic) syllabus in the UPSC pattern 200 marks3 h11 questions, 6 sections, attempt 6Live
GM2 Geo-Scientist Paper I, Mock 2Paper I · Whole Paper I (inorganic) syllabus in the UPSC pattern 200 marks3 h11 questions, 6 sections, attempt 6Live
GM3 Geo-Scientist Paper II, Mock 1Paper II · Whole Paper II (physical) syllabus in the UPSC pattern 200 marks3 h15 questions, 3 sections, attempt 10Live
GM4 Geo-Scientist Paper II, Mock 2Paper II · Whole Paper II (physical) syllabus in the UPSC pattern 200 marks3 h15 questions, 3 sections, attempt 10Live
GM5 Geo-Scientist Paper III, Mock 1Paper III · Whole Paper III (analytical and organic) syllabus in the UPSC pattern 200 marks3 h10 questions, 2 sections, attempt 6Live
GM6 Geo-Scientist Paper III, Mock 2Paper III · Whole Paper III (analytical and organic) syllabus in the UPSC pattern 200 marks3 h10 questions, 2 sections, attempt 6Live

Writing Civil Services and IFoS? Combined series

Both series, 24 paid tests, for ₹11,000: ₹1,000 less than buying them separately. Already hold one series? Add the other for the difference.

Civil Services + IFoS

Save ₹1,000

26 tests 16 sectional + 10 full-length · first test free · 24 paid × ₹500

Fee ₹11,000

What you get

You get

  • Both series: all 14 Civil Services tests and all 12 IFoS tests (24 paid tests), ₹1,000 less than buying them separately
  • Question paper and UPSC-style answer booklet of every test (PDF)
  • Model answers of a test, opened as soon as you upload your own copy of it
  • Your copy checked by VKC, returned with marks and comments on every answer
  • All VKC Basic study material (notes, short notes, solved PYQs, handbook, daily answer archive) until your Mains
  • Valid till each exam's Mains 2027

Not included

  • Geo-Scientist tests
  • Prelims tests
Enrol

Free · every morning

Daily answer writing

One Mains question a day from the syllabus common to all three exams, with the model answer the next morning. Build the habit before the tests start.

Today's question

Questions about the Mains series

How is the fee worked out?

₹500 for each paid test, and the first test of each series is free. Each fee includes the question paper, the answer booklet, the model answers, your copy checked by VKC with marks and comments, and all VKC Basic study material (notes, solved PYQs, handbook, daily answer archive) until your Mains.

What is VKC Plus?

For Geo-Scientist only: ₹4,999 opens the papers of all 19 tests and VKC checks any 10 of your choice. If you later want the other 8 checked, add them for ₹4,000; the total, ₹8,999, is the same as the complete series.

I am writing Civil Services and IFoS. Do I pay twice?

They are separate series with different sectionals (S1–S8 for Civil Services, I1–I8 for IFoS). The combined series costs ₹11,000, ₹1,000 less than both separately. If you bought one first, add the other for the difference (₹4,500 or ₹5,500).

Till when are the series valid?

Till your Mains exam of 2027. The study material that comes with a series stays open for the same time.

When do the tests start?

There is no fixed start date. Each test goes live as soon as it is written and checked, and stays open, so you can take it when it suits your preparation.

What do I download for each test?

Three PDFs: the question paper; the question-cum-answer booklet in the UPSC layout, with every question followed by its writing space (1 page for every 5 marks); and the model answers, which open after you upload your copy.

How do I upload my answer copy?

On the test page, choose your scanned PDF or photos of your pages. The page shrinks them for you and leaves out blank pages; upload only the pages you wrote on (limit 15 MB). You can replace it until checking starts.

How long are copies kept?

Your uploaded copy and the checked copy are kept for 6 months after checking, then removed from storage. Your marks and comments stay on the test page, so download the checked copy when it arrives.

When can I see the model answers?

Right after you upload your copy, so you compare honestly after writing, not before.