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Home / Chemistry / International Chemistry Olympiad (IChO) Past Papers Questions

International Chemistry Olympiad (IChO) Past Papers Questions

Chemistry Olympiad (IChO) Past Papers Questions

chemistry olympiad past papers

International Chemistry Olympiad (IChO) is the Toughest Chemistry Competition for high School students, which held every year in the month of June – July in a different country. It is also known as the World championship Chemistry Competition.

The main aim of IChO Contest is to test the highest level of knowledge in Chemistry, critical thinking, problem solving, right practices of presentation and analysis, and hands-on skills in theoretical and experimental Chemistry.

Here, High school Students or Chemistry Olympiad candidates will get all the guidance, Notes and the Past papers of IChO, that will help you to understand about the level of this test and to achieve High score in this contest.

 
CHEMISTRY OLYMPIAD EXAM PAPERS DETAILS
 
SYLLABUS (Appendix C & D) Click Here     Click Here
SELECTION PROCESS Click Here
HOST COUNTRIES Click Here
RESULTS Click Here
NOTES Click Here
BOOKS

CHEMISTRY OLYMPIAD PAST PAPERS

We are providing the Chemistry Olympiad (IChO) Preparatory problems & Past year papers Questions & Answers of  from the basic to advance. You could increase your concept up to the high level if you will be able to solve all previous questions. Good Luck!

 
CHEMISTRY OLYMPIAD PAST PAPERS QUESTIONS
 
Year Exam Type Problems Solutions
2019 Theory T1 (Infinite well & Butadiene)
T2 (Hydrogen Production by Water-splitting)
T3 (Silver Chloride)
T4 (From Black powder to Discovery of Iodine)
T5 (Complexes for Formation of Nanomachines)
T6 (Characterization of Block-Copolymer)
T7 (Ring motion in Catenane)
T8 (Identification & Synthesis of Inositols)
T9 (Synthesis of levobupivacaine)
  General Instructions
  PROBLEM & SOLUTION
Experimental E1-E3 (Deionized Water, Ethanol, Wine sample)
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T27
E1-E6
  PROBLEM & SOLUTION
2018 Theory T1 (DNA)
T2 (Repatriation of Remains in Middle Ages)
T3 (Emerging Electro-mobility)
T4 (Column Chromatography of Radioactive Copper)
T5 (Bohemian Garnet)
T6 (Let’s go Mushrooming)
T7 (Cidofovir)
T8 (Caryophyllene)
  PROBLEM & SOLUTION
Experimental E1-E2 (Water)
  PROBLEM & SOLUTION
Theory
(Preparatory Problems)
T1-T28
  PROBLEM SOLUTION
Experimental
(Preparatory Problems)
E1-E8
  PROBLEM SOLUTION
2017 Theory T1 (Production of Propene)
T2 (Kinetic Isotope Effect (KIE) & Zero-Point Vibrational Energy (ZPE))
T3 (Thermodynmics of Chemical Reactions)
T4 (Electrochemistry)
T5 (Phosphate & Silicate in Soil)
T6 (Iron)
T7 (Chemical Structure Puzzles)
T8 (Silica Surface)
T9 (Into the Unknown)
T10 (Total Synthesis of Alkaloids)
T11 (Twist & Chirality)
  Information Booklet
  PROBLEM & SOLUTION
Experimental E1-E2 (Acid-base Indication, Calcium iodate, Elaborating Carbon Framework)
  PROBLEM SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T32
E1-E5
  fx-911EX (Casio Guide)
  PROBLEM
  Problem Correction SOLUTION


2016 Theory T1 (Nitrogen Trifluoride)
T2 (Red Copper Oxide)
T3 (Iodine Deficiency)
T4 (Application of Kinetic Studies In water Treatment)
T5 (Synthesize Blue Pigment)
T6 (Cure for Alzheimer’s Disease)
T7 (Synthesis of Dalasetron Mesylate)
T8 (D-Glucose)
  PROBLEM & SOLUTION
Experimental E1-E3
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T29
E1-E7
  PROBLEM
2015 Theory T1 (New & well-forgotten old Refrigerants)
T2 (Coupling of Chemical Reactions)
T3 (Two Binding Centers – Competition or Cooperation)
T4 (Simple Inorganic Riddle)
T5 (Indispensable Glucose)
T6 (Bread Is Stuff of Life)
T7 (Not by Bread Alone)
T8 (Oil for Life & Life After Oil)
  Statistical Data
  PROBLEM & SOLUTION
Experimental E1-E3
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T26
E1-E8
  PROBLEM
  Correction
  28-29 Updated Problem SOLUTION
2014 Theory & Experimental T1 (Polyenes)
T2 (Dissociating Gas Cycle)
T3 (High-valent Silver Compounds)
T4 (Zeise’s Salt)
T5 (Acid-base Equilibria In Water)
T6 (Chemical Kinetics)
T7 (Synthesis of Artemisinin)
T8 (Star Anise)
T9 (Heterocycle Preparation)
E1-E3
  PROBLEM & SOLUTION


2013 Theory & Experimental T1 (Clathrate Gun)
T2 (Break down Photosynthesis)
T3 (Meerwein-Schmidt-Ponndorf-Verley reaction)
T4 (Simple Inorganic Experiment)
T5 (Estimates of Graphene Properties)
T6 (Cyclopropanes)
T7 (Diverse Permanganatometry)
T8 (Unique Life of Archaea)
E1 (Syntheesis of 2,4-dinitrophenylhydrazones)
E1 (Langelier Saturation Index of Pool Water)
E1 (Molecular Mass by Viscometry)
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T27
E1-E8
  PROBLEM & SOLUTION
 2012 Theory & Experimental  T1 (Boron Hydrides & Other Boron Compounds)
T2 (Platinum(II) Compounds, Isomers, & Trans Effect)
T3 (Thiomolybdate Ions)
T4 (Ceramic Materials)
T5 (DNA)
T6 (Varenicline as Treatment for Smoking Addiction)
T7 (Artificial Enzyme to Bind 2 Substrate Molecules)
T8 (Polycyclic Aromatic Hydrocarbons (PAHs))
E1 (Kinetics, Isotope Effect, & Mechanism of Iodination of Acetone)
E2 (Synthesis of Salen Manganese Complex)
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T27
E1-E6
  PROBLEM & SOLUTION
2011  Theory & Experimental  T1 (Nitrogen Oxides)
T2 (Anhydrous Ammonia)
T3 (Energy of Gaseous Diatomic Molecule)
T4 (Hydrogen in Fuel Cell for Electricity)
T5 (Polynitrogen)
T6 (Extraction of Gold Using Sodium Cyanide)
T7 (Synthesis of Carbasugar)
T8 (Mandelic Acid)
E1 (Analysis of Chloride Mixture)
E2 (Hydrogen Generation from Ammonia Borane)
E3 (Synthesis, Purification & Sepration of Diastereomeric Mixture)
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T20
E1-E2
  PROBLEM & SOLUTION
 2010 Theory & Experimental  T1 (Chemically & Atmospheric Nitrogen)
T2 (Crystal Structure of Alkali Metal Halide)
T3 (Chemical Oxygen)
T4 (Lithium Ion Battery)
T5 (Photon Energy)
T6 (Isomeric Organic Compounds)
T7 (Puffer Fish (Tetrodotoxin))
T8 (Polymerization)
T9 (α-Cyclodextrin)
E1 (Reaction of Hantzsch Ester with Urea Hydrogen Peroxide)
E2 (Fe(II) & FE(II) by Visul colorimetry)
E3 (Polymers In Analysis)
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T31
E1-E9
  PROBLEM & SOLUTION
2009 Theory & Experimental T1 (Avogadro Constant)
T2 (Interstellar Production of H2)
T3 (Protein Folding)
T4 (Synthesis of Amprenavir)
T6 (Epoxy Resins)
T7 (Transition Metal Complexes)
E1 (Environmentally Friendly Aldol Condensation)
E2 (Analysis of Copper (II) Complex)
E3 (Critical Micelle Concentration of Surfactant)
  PROBLEM & SOLUTION
Theory
(Preparatory Problems)
T1-T28
  PROBLEM
Experimental
(Preparatory Problems)
E1-E5
  PROBLEM
CHEMISTRY OLYMPIAD PAST PAPERS
 2009 – 2013 Theory & Experimental PROBLEM & SOLUTION


2008 Theory & Experimental T1 (Dilute Aqueous solution of Acid)
T2 (Determine structure of compounds A – H)
T3 (Vinpocetine Drugs)
T4 (Acid catalysis)
T5 (white Crystalline substances)
T6 (Feathery, greenish solid precipitate)
T7 (Dithionate ion prepared)
T8 (Lanthanide(III) ions)
T9 (Thallium oxidation states)
E1 (Synthesis of α-D-glucopyranose pentaacetate)
E2 (Potassium hexacyanoferrate(II))
E3 (Handle Toxic & Corrosive unknown solutions)
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T29
E30-E37
  PROBLEM & SOLUTION
 2007 Theory & Experimental T1 (Proton Tunneling)
T2 (Nanochemistry)
T3 (Unstable chemical reaction)
T4 (Determination of Water by Fischer titration)
T5 (Mysterious mixture (Organic hide-and-seek game))
T6 (Silicates as base of Earth crust)
T7 (Atherosclerosis & Intermediates of cholesterol biosynthesis)
T8 (ATRP allows new polymers)
E1 (Ion-exchange chromatography of Amino acids)
E2 (Determination of Carbonate & Hydrogen phosphate in Abrasive sample)
  PROBLEM & SOLUTION
Theory
(Preparatory Problems)
T1-T28
  PROBLEM SOLUTION
Experimental
(Preparatory Problems)
E29-E34
  PROBLEM SOLUTION
 2006 Theory & Experimental T1 (Avogadro’s number)
T2 (Detection of Hydrogen)
T3 (Interstellar chemistry)
T4 (Chemistry of DNA)
T5 (Acid-Base Chemistry)
T6 (Electrochemistry)
T7 (Hydrogen Economy)
T8 (Chemistry of Iron Oxides)
T9 (Photolithographic process)
T10 (Natural Products – Structural analysis)
T11 (Enzyme reaction)
E1 (Spectrophotometric Analysis)
E2 (Acid-Base Titration of Acetic acid & Salicylic acid)
E3 (Qualitative analysis of Organic compounds)
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T30
E31-E36
  PROBLEM SOLUTION
 2005 Theory & Experimental  T1 (Chemistry of Amides & Phenols)
T2 (Organic Synthesis & Stereochemistry)
T3 (Organic Photochemistry & Photophysics)
T4 (Gold capital of Asia)
T6 (Lewis Structure)
T7 (Alkalinity of Water & Solubility of CO2)
T8 (Kinetic Behaviour of Ozone)
T9 (Protein Folding)
E1 (Synthesis of D,L-Phenylglycine & Its Enantiomeric resolution)
E2 (Identification of Unknown Inorganic Samples)
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T27
E28-E35
  PROBLEM SOLUTION


 2004 Theory & Experimental  T1 (Thermodynamics)
T2 (Kinetics at Catalyst Surfaces)
T3 (Monovalent Alkaline earth compounds)
T4 (Determining Atomic Masses)
T5 (Biochemistry with Thermodynamics)
T6 (Diels-Alder Reactions)
T7 (Stereochemistry in Drugs)
T8 (Colloids)
E1 (Two-step Organic synthesis of 2,2-Bis(p-phenyleneoxyaceticacid) Propane(Bisphenol A bis(carboxymethyl) ether))
E2 (Analysis of Superconductor)
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T34
E35-E40
  PROBLEM SOLUTION
 2003 Theory & Experimental  T1-T24 (General Chemistry)
T25-T30 (Physical Chemistry)
T30-T33 (Organic Chemistry)
T34-T35 (Inorganic Chemistry)
E1 (Synthesis of Dipeptide N-acetyl-L-prolinyl-L-phenylalanine Methyl Ester)
  PROBLEM & SOLUTION
*Theory & Experimental
(Preparatory Problems)
T1-T32
E33-E39
  PROBLEM & SOLUTION
 2002 Theory & Experimental  T1 (Oxygen in your Life)
T2 (Nitrogen Cycle in Nature)
T3 (Inulin, New Renewable Raw Material)
T4 (Production of Methanol)
T5 (Aramids, High-Performance Polymeric Materials)
T6 (Phospholipids in Membranes)
T7 (Glutathione, An Essential Mini-Peptide)
T8 (Lighting Lamps)
T9 (Red Ruby)
T10 (Vehicle Traction Batteries)
E1 (Enzymatic Hydrolysis of Methyl N-Acetyl-phenylalaninate)
E2 (Synthesis of Benzylhydantoin)
E3 (Determination of Iron in Iron Pills)
  PROBLEM & SOLUTION
*Theory & Experimental
(Preparatory Problems)
T1-T23
E24-E29
  PROBLEM & SOLUTION
 2001 Theory & Experimental  T1 (Hydrogen atom & Hydrogen Molecule)
T2 (Phosphoric Acid)
T3 (Second Law of Thermodynamics)
T4 (Beach Sand Mineral in Kerala)
T5 (Halogen Chemistry)
T6 (Organc chemistry of Indian Spices)
T7 (Peptides & Proteins)
E1 (Preparation of 2-Iodabenzoic acid)
E2 (Estimation of Mn(II) & Mg(II) Present)
E3 (Determination of Rate constant for Redox reaction)
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T20
E21-E24
  PROBLEM SOLUTION
 2000 Theory & Experimental  T1 (Synthesis of compounds with Wound Healing Properties)
T2 (Bridge b/w Denmark & Sweden)
T3 (Bioinorganic Chemistry)
T4 (Naturally occurring Compound)
T6 (Protein & DNA)
T7 (Hard Water)
E1 (Preparation of Potassium tris(oxalato) manganate(III) Hydrate)
E2 (Synthesis of Amino acid Methyl ester Hydrochloride)
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T20
E21-E24
  PROBLEM SOLUTION


 1999 Theory & Experimental  T1 (Carbon, Hydrogen & Oxygen problem)
T2 (Diprotic acis, H2A)
T3 (Radioactive Decay)
T4 (Ligand L)
T5 (Glycoside found in Rosaceae seeds)
T6 (Amino acids Asp,Cystine, Glu, Gly, IIe, Leu, Pro, & Tyr)
E1 (Kinetic study of Acid Catalyzed Reaction)
E2 (Isolation & Identification of Essential Oil)
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T21
E22-E23
  PROBLEM & SOLUTION
 1998 Theory & Experimental  T1 (Analysis of Alloy contains Tin & Lead)
T2 (Dating Historical Events using Pb-210 & Separation of Radionuclides)
T3 (3-Dimensional structures of Polycyclic molecules)
T4 (Atomic Orbitals)
T6 (Metallic Gold extraction)
T7 (Carbon, Tin problem)
T8 (Fungus Aspergillus Nidulans)
E1 (Determination of Calcium)
E2 (Analysis of Mixture of Cobalt(III) Complexes)
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T26
E27-E30
  PROBLEM & SOLUTION
 1997 Theory & Experimental  T1 (Trisaccharide Compound)
T2 (Acid Raain Reaction (MIT))
T3 (Asthma drug MK-0476)
T4 (Acidic Indicator HIn)
T5 (Iron Metal crystalline forms)
T6 (Platinum group metals)
T7 (Chlorine Cl2)
T8 (Electrolyte)
E1 (Determination of Mg2+ & Ca2+)
E2 (Organic Qualitative analysis)
E3 (Synthesis of Substituted Dihydro-1, 3-benzoxazine (C))
  PROBLEM & SOLUTION
Theory & Experimental
(Preparatory Problems)
T1-T45
E44-E50
  PROBLEM & SOLUTION
 1996 Theory & Experimental  T1 (Stereoregular Polymerization of Unsaturated Hydrocarbons)
T2 (Analysis of Trace amount of Elements)
T3 (Emission of α-particles (x) by radium)
T4 (Analysis for Separation of ions)
T5 (Potentiometric & Spectrophotometric Methods)
T6 (Isomeric Hydrocarbons)
T7 (Stereochemistry of Organic compounds)
E1 (Determination of Concentration of Copper(II) & Iron(III))
E2 (Determination of Paracetamol
  PROBLEM & SOLUTION
 1995 Theory & Experimental  T1 (Rust on Carillon (Ancient bronze Musical Instrument))
T2 (Milk Serum)
T3 (1,3-Dihydroxyacetone to glyceraldehyde)
T4 (Poly[(R)03-hydroxyalkanoic acids])
T5 (Action of Nitric oxide upon human body)
T6 (Surfactant Molecule)
E1 (Identification of Unknown Solutions)
E2 (Preparation of cis-Copper-bis-Glycinate Hydrate)
E3 (Determination of Copper(II))
  PROBLEM & SOLUTION
 1994 Theory & Experimental  T1 (Lactic Acid)
T2 (Nitrogen in Agricultural Material)
T3 (Sulphur compounds with Oxygen & Halogens)
T4 (Platinum (IV) oxide)
T5 (Multiple Choice Questions)
T6 (Optical Active Compound)
T7 (Four Problems)
T8 (U-238, 235 Atom)
E1 (Determination of Fatty Acids)
E2 (Volumetric determination of Bromide)
  PROBLEM & SOLUTION
 1993 Theory & Experimental  T1 (Radioactive Isotope in Nuclear Medicine)
T2 (Reflux of Bile Duodenal Matter)
T3 (Poisoning by Carbon monoxide)
T4 (Frontalin Pheromone of western pine Beetle)
T5 (Treatment with Hydroborating Agent)
E1 (Cholesterol)
E2 (Citric Acid)
  PROBLEM & SOLUTION
 1992 Theory & Experimental  T1 (Photosynthesis)
T2 (Chemical Reaction)
T3 (Coniferyl Alcohol)
T4 (Obtain Rose Oil)
T5 (Nitrogen dioxide)
T6 (Concentration of Carbon dioxide)
T7 (Salinity in Bay)
T8 (Pourbaix diagrams for Water, Nitrogen & Manganese)
T7 (Pheromones)
E1 (Effects of CO2 on Solubility)
  PROBLEM & SOLUTION
 1991 Theory & Experimental  T1 (Monoprotic Non-coordinating Acid)
T2 (Polymer)
T3 (Type II Electrodes)
T4 (Energy of Stable states of Hydrogen Atom)
T5 (Halogen derivatives of Hydrocarbons)
T6 (Sulphuric Acid produced by Catalytic oxidation)
E1 (Determination of Acid dissociation constant)
E2 (Determination of formation constants of complex Ions)
  PROBLEM & SOLUTION
 1990 Theory & Experimental  T1 (Phosphoric Acid)
T2 (Aqueous Solutions of Coppper Salts)
T3 (Synthesis of Haloperidol)
T4 (Chemical Thermodynamics)
T5 (Chemical Kinetics)
T6 (Bio-Organic Chemistry)
T7 (Hydrogenation of Benzene to Cyclohexane)
E1 (Synthesis Involving Carbanions Chalcone)
E2 (Qualitative Analysis of Five Flasks)
E3 (Titration of Oxygen Dissolved in Water)
E4 (Kinetics of Sn 1 Reaction)
  PROBLEM & SOLUTION
 1989 Theory & Experimental  T1 (Copper(II) iodate)
T2 (Carbon monoxide & Hydrogen)
T3 (Sulphur dioxide)
T4 (Phosphorus Pentachloride)
T5 (Carboxylic Acids)
T6 (Fats (Lipids) cotain Non-polar & Polar group)
E1 (Preparation of 2-Ethanoyloxybenzoic Acid)
E2 (Mass of 2-Ethanoyloxybenzoic Acid)
  PROBLEM & SOLUTION
CHEMISTRY OLYMPIAD PAST PAPERS
 1989 – 2008 Theory & Experimental PROBLEM & SOLUTION


1988 Theory & Experimental T1 (Periodic system of Elements in 3D world)
T2 (Mixture of 3 compounds formed by mixture of A & Fluorine)
T3 (Fuel consumption in 4 cylinder car)
T4 (Determine chloride ions by precipitating with Silver Nitrate)
T5 (Dehydration)
T6 (Analyzing Sea mussels)
E1 (Synthesis of derivate (NaHX) of sodium salt of Organic acid)
E2 (Spectrophotometric determination of concentreation)
  PROBLEM & SOLUTION
1987 Theory & Experimental T1 (Treating Waste water in Sewage plant)
T2 (Hydrated sodium salt of phosphoric acid dissolved in molar sulphuric acid)
T3 (Solution of Potassium chloride & Potassium cyanide)
T4 (Structural formulae of compounds)
T5 (Multiple problems)
E1 (Investigate seven Inorganic compounds)
E2 (Estimate the heat (enthalpy) change)
E3 (Determine concentrations of Hydrochloric acid & Potassium iodate)
  PROBLEM & SOLUTION
1986 Theory & Experimental T1 (Compounds containing Divalent Platinum)
T2 (Compound in detergent to bind Ca2+ & Mg2+)
T3 (Coloured Dyes)
T4 (High efficiency of Catalysis)
T5 (Bacterial conversion of Saccharose)
T6 (Recombinant DNA Technology)
T7 (Distillation)
E1 (Synthesis of Nickel(II) salt)
E2 (Analysis of Nickel Salt)
  PROBLEM & SOLUTION
1985 Theory & Experimental T1 (Alloy containing Aluminium)
T2 (Prepare ions from Oxygen molecules)
T3 (Calcium Sulphate soluble compound)
T4 (Racemisation of Pinene)
T5 (Eqilibrium voltage of Cell)
T6 (Sympathomimetic effect)
T7 (Aqueous-ethanolic solution of sodium hydroxide)
T8 (Anaerobic degradation of saccharides)
E1 (Determination of Relative molecular mass of weak acid by acid base titration)
  PROBLEM & SOLUTION
1984 Theory & Experimental T1 (Stable Isotopes of carbon element)
T2 (Tetracarbonylnickel Formation)
T3 (Weak acid of concentration)
T4 (Gaseous hydrocarbon mixed with Oxygen & Ignited)
T5 (Diastereotopic methylene protons)
T6 (Hydrocarbon separated via dimerization)
T7 (DNA)
T8 (Amino Acids in Peptide)
E1 (Nitration of Phenacetine with Nitric acid in acetic acid as solvent)
E2 (Determination of the content of phosphoric acid in cola drink)
  PROBLEM & SOLUTION
1983 Theory & Experimental T1 (Multiple Questions)
T2 (Gaseous mixture of CO & CO2)
T3 (sample mixture of Sodium chloride & potassium chloride)
T4 (Alkaline hydrolysis of chlorinated compounds)
T5 (Formation of Ethylene by dehydration reaction)
T6 (Compound reacts with 3 moles in aqueous solution)
T7 (Determine formulae of Isomers compounds)
E1 (Identify functional groups of compounds)
E2 (Mixture of Oxalic acid & Ammonium oxalate)
E3 (Aqueous solutions contained n test tubes)
  PROBLEM & SOLUTION
1982 Theory & Experimental T1 (MCQ’s)
T2 (Quantitative Analysis of Carbon & Hydrogen)
T3 (Formaldehyde production)
T4 (Transition metal bond)
T5 (Solubility of Iodine)
T6 (White solid organic acid)
T7 (Calcium oxalate)
E1 (Prepare phosphate buffer )
E2 (Chemical equations of Reactions observed)
E3 (Determine the solubility product of Lead(II) chloride)
  PROBLEM & SOLUTION
1981 Theory & Experimental T1 (Sample participates in Transformations)
T2 (Maleic Acid)
T3 (X Compound isolated from Neutral product)
T4 (Thermal Decomposition of Water)
T5 (Structural Isomers compounds)
T6 (Catalytic decomposition of Isopropanol)
E1 (Pure Inorganic substances solutions in 14 test tubes)
E2 (Determine the samples by using Reagents)
E3 (Determination of Sodium & Sodium hydrogen carbonate)
  PROBLEM & SOLUTION
1980 Theory & Experimental T1 (Dissociation of Chlorine (Endothermic Process))
T2 (Water gas Equilibrium)
T3 (Chemistry of ions, Stoichiometry, Redox reactions)
T4 (Organica chemistry, Stereochemistry)
T5 (Inorganic chemistry)
T6 (Organic chemistry, syntheses)
E1 (Qualitative organic analysis)
E2 (Evaluating solubility)
E3 (Titrimetic determination of potassium peroxodisulfate (K2S2O8))
  PROBLEM & SOLUTION


1979 Theory & Experimental T1 (20 MCQ’s)
T2 (Cadmium, Tin, Bismuth, & Lead alloys treated with concentrated Nitric acid)
T3 (Chemical Processes 5 Problems)
T4 (Nitrogen & Hydrogen contained compound)
T5 (Benzene Derivative)
T6 (Unknown metal treated with Excess of Dilute nitric Acid)
E1 (10 Substances found in 10 Test tubes)
E2 (Determine mass of Potassium Permanganate)
  PROBLEM & SOLUTION
1978 Theory & Experimental T1 (Chromium ore)
T2 (Water sample investigation)
T3 (Chromium plating by Electrolysis in chromic acid)
T4 (Ethane in sealed vessel)
T5 (Liquid organic compound burn)
E1 (Four Aqueous solutions)
E2 (Standard reduction potentials Redox system)
  PROBLEM & SOLUTION
1977 Theory & Experimental T1 (Three salts composition)
T2 (Halogen reacts with Aqueous solution, & Permanganate ions with hydrogen peroxide )
T3 (Isomeric cyclobutane dicarboxylic acid)
T4 (Two Compounds C7H14O6 different physical properties)
T5 (Two copper(I) salts solution in water)
T6 (Determine Amino acids)
T7 (Photosynthesis)
T8 (Determine molar mass of X element)
E1 (Reactant Concentration)
E2 (Thermometric Titration of Hypochlorite Solution)
E3 (Excess of Hydroxide solution)
  PROBLEM & SOLUTION
1976 Theory & Experimental T1 (Peroxo compounds International symbols & Formulas)
T2 (Crystallohydrate of MxAy.zH2O)
T3 (Iron(II) sulphide FeS Contains Metallic Iron react with HCL)
T4 (Natural substances react with Alkali Hydroxide solution)
T5 (Organic substance reacts with sodium hydroxide solution)
T6 (Temperature measured by gaseous Thermometer)
T7 (Density of Sulphuric Acid soluton in charged Lead accumulator)
E1 (Cations & Anions contained sample)
E2 (Sodium oxalate & oxalic acid contained solution)
E3 (Unknown organic aliphatic compounds)
  PROBLEM & SOLUTION
1975 Theory & Experimental T1(Crystallised KAl(SO4)2.12 H2O from KAl(SO4)2 Solution)
T2 (Alloy Prepared contains Al, Zn, Si, Cu)
T3 (Dissolved Silver, Copper, Chromium alloy)
T4 (pH value of Solution)
T5 (Aldehydes in Aqueous solution)
T6 (Equilibrium constant of Reaction)
T7 (Saturated Hydrocarbon by Catalytic oxidation)
T8 (Table Problem)
E1 (Aqueous solutions of Compounds & react with others)
E2 (Solid compound chloride, iodide, oxide, hydroxide, sulphide, sulphate or carbonate in Test tubes)
E3 (Aromatic compounds: hydrocarbon, phenol, & aldehyde in Sealed Ampoules)
E4 (Crystalline sodium carbonate stored for long time)
  PROBLEM & SOLUTION
1974 Theory & Experimental T1 (Electrochemical decomposition of water)
T2 (Find Substance problem)
T3 (Molar solutions problem)
T4 (Organic compounds mixture)
T5 (Mixture of Two metals)
E1 (Determine Unknown samples in test tubes)
E2 (Determine cations in solutions)
E3 (Solution contains two cations & two anions )
  PROBLEM & SOLUTION
1973 Theory & Experimental T1 (Mixture of Formic acid with excess of Ethanol)
T2 (Mixture of Gaseous hydrocarbon & Oxygen)
T3
(Molar solution of CH3COOH & HCIO
)
T4 (Solution of Unknown substances)
T5 (Synthesis of Benzene)
T6 (Gaseous mixture hydrocarbons)
E1 (12 Salt solutions)
E2 (Compounds in 6 test tubes)
E3 (Chemical equations for reactions)
  PROBLEM & SOLUTION
1972 Theory & Experimental T1 (Solid elements treat with excess of Hydrochloric acid)
T2 (Metallic Iron prepared Iron (II) & Iron (III))
T3 (Electrolysis)
T4 (Sodium hydroxide & hydrochloric acid solution)
T5 (Bromine with Unknown Hydrocarbon)
T6 (Organic Compound (C,H,O) with Ethanol)
E1 (Determine unknown samples)
E2 (Mixture of Formic acid withexcess of Ethanol)
  PROBLEM & SOLUTION
1970 Theory & Experimental T1 (Burned Gas gives CO2 & water)
T2 (Crystalline Soda React with HCl)
T3 (Carbon monoxide mixed with water vapours)
T4 (Alloy consist of Rubidium & other alakali metals)
T5 (Cooper (II) oxide treated with stoichiometric sulphuric acid solution)
T6 (Relative atomic mass of metal)
E1 (Mixture of 1.2-molar H2SO4 & 1.47-molar HCL)
E2 (10 equations of Chemical Reactions)
  PROBLEM & SOLUTION


1969 Theory & Experimental T1 (Potassium Sulphate in water, Electrolysed)
T2 (Potassium, Nitrogen, Oxygen contained compound)
T3 (Unknown Gaseous Hydrocarbon with Oxygen set on fire)
T4 (Calcium carbide & Water)
E1 (Two substances mixture in test-tubes)
E2 (N HCl solution with metl sample)
  PROBLEM & SOLUTION
1968 Theory & Experimental T1 (Hydrogen & Chlorine)
T2 (Reactions Problems)
T3 (Gas Escaping frome Blast Furnace)
T4 (Neutralization of Organiic Acid)
E1 (Aqueous Solutions of Salts)
E2 (Identification of Substances)
  PROBLEM & SOLUTION
CHEMISTRY OLYMPIAD PAST PAPERS
 1968 – 1988 PROBLEM & SOLUTION
 
CHEMISTRY OLYMPIAD PAST PAPERS
 

 

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