INChO: Indian National Chemistry Olympiad

INChO is conducted by the Indian Association of Chemistry Teachers (IACT) and Homi Bhabha Centre for Science Education for the students of class 11th and 12th to judge the student’s performance in Chemistry.
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InCho consists of 80 questions with negative markings.

The medium used for the Olympiad is English.


The CBSE syllabus designs the syllabus. Hence, the students need to prepare mostly from the 7th to 10th books to brush up on their basics. Some of the topics are:

Inorganic Chemistry
  1. Electronic Configuration of atoms and ions
  2. Trends in the periodic table
  3. Trends in physical properties
  4. Structures
  5. Nomenclature
  6. Chemical calculations
  7. Isotopes
  8. Natural cycles – s, p and d block
  9. Other inorganic problems
2. Organic Chemistry
  • Alkanes
  • Cycloalkanes
  • Alkenes
  • Alkynes
  • Arenes and heterocycles
  • Halogen compounds
  • Alcohols and phenols
  • Carbonyl compounds
  • Carboxylic acids
  • Nitrogen compounds
  • Other organic topics
3. Physical Chemistry
  • Chemical equilibria
  • Ionic equilibria
  • Electrode equilibria
  • Kinetics of homogenous reactions
  • Thermodynamics (first and second law)
  • Phase system
4. Biochemistry
  • Amino acids and peptides
  • Proteins
  • Fatty acids and fats
  • Enzymes
  • Saccharides
  • Krebs cycle and respiration chain
  • Nucleic acids and respiration chain
  • Other biochemical problems – hormones regulation, insulin etc.
5. Experimental part
  • Synthesis of inorganic and organic compounds
  • Identification of inorganic and organic compounds (general principles)
  • The diagnosis of some inorganic and organic compounds (general principles)
  • Special measurements and procedures
  • Evaluation of results

Preparation tips-

1. Comprehend the syllabus and exam pattern-

The syllabus of the Olympiad is very vast, so you need to have great knowledge and understanding of the concepts. First, analyze the exam pattern so you may have an idea what are the important topics.

2. Begin on time

As discussed before, the syllabus is vast, so you need to start your preparation on time not to miss any topic/concept.

3. Take help online-

There are no. Online resources that might prove helpful for you, so you can supplement them with the rest of the study material.

4. Do not leave organic chemistry behind-

The INChO ask a wide variety of topics from organic chemistry. Basic reactions, nomenclature etc., are critical. So keep a good hold on them.

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Anirudh Gupta
IIT Delhi Computer Science CBSE Class 12 - 94.2% RMO Awardee
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