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CBSE 12th Boards: great tips for a high chemistry score

Board exams 2017 Updated: Mar 17, 2017 17:51 IST
Class 12

For chapters of physical chemistry which include solid state, solution, electrochemistry, chemical kinetics and surface chemistry, it is better to practice numerical problems on each formulae.(Getty Images)

Among all core science subjects, chemistry has been a subject that has been comparatively easier to handle during the Class 12 Board exams. However, the same could change in 2017 and students need to be prepared for any surprises. The reason why one must not worry too much about it is because if your revision plan is well thought out you can get a really good score no matter how ‘tough’ the paper.

This is what you should remember

For chapters of physical chemistry which include solid state,solution,electrochemistry, chemical kinetics and surface chemistry, it is better to practice numerical problems on each formulae. Try to master reasoning-type and numerical questions on crystal defects, ideal and non-ideal solutions, azeotropes, dilution and its relation with conductivity, molar conductivity, Kohlrausch law, Faraday laws, batteries and their cell reactions involved , adsorption isotherms, colloids and its properties and applications.

For the next section involving chapters like p, d and f block, coordination compounds and metallurgy, try to develop a deep understanding of concepts to be able to write balanced chemical equations (marks are deducted if you don’t do so) and draw structures of oxoacids, compounds of xenon, hydrolysis reactions involving xenon fluorides, VBT (Valance-Bond Theory) related complexes and CFT (Crystal Field Theory), preparation and properties of permanganate and dichromate, metal carbonyl bonding and reasoning related to metallurgy.

In the next section involving organic chemistry, chapters like haloalkanes and haloarenes, alcohols, phenol and ethers, aldehydes, ketones and carboxylic acids and amines, students must practice important topics like substitution and elimination reactions of haloalkanes and haloarenes, reactions involving Grignard reagent, and mechanisms from alcohol and phenol and ethers. Name reactions must be given due importance as conversion questions are based on it. Distinction tests such as Lucas test for alcohols, haloform test, Tollens’ test, Fehling solution test for aldehydes and ketones and Hinsberg’s test for amines are important. Moreover, questions based on acidity of alcohols, phenols and carboxylic acids, basic strength for amines, chemistry of diazonium salt etc are to be done properly.

Last section of chapters involving polymers, biomolecules and chemistry in everyday life are useful for value-based questions, along with reasoning based questions. It is important to have a clear understanding of topics like structures of cyclic glucose and fructose, glycosidic, peptide linkages, types of protein and nucleic acid. In polymers, classification of polymer, monomers of each type of polymers and at least two uses of each must be prepared well. Therapeutic importance of different classes of drug must be done along with chemicals in food and cleansing action. NCERT solved and unsolved problems along with exemplar ones are a good source for practice for all these sections.

It is important to plan well and reach the target score in a more predictable manner. Best of Luck!

The author is HOD-Chemistry, Studymate (Hindustan Times Learning Centres) and can be reached at