Stoichiometry JEE involves a thorough understanding of the concepts. It is a basic chapter of JEE Chemistry, mostly the first chapter that you might have studied when you started JEE preparation. Questions asked in JEE may be of moderate difficulty. However, there can be easy as well as difficult questions too. Furthermore, concepts from stoichiometry are used in various important chapters like Equilibrium or Thermodynamics.
A number of questions have been asked in recent years from this chapter in JEE Advanced, in the form of Matrix-Match Type Questions and Paragraph Type Questions. Sometimes, concepts of Stoichiometry are very useful in solving questions from other topics such as Solutions, Energetics etc. At least two questions have been asked every year from this topic in JEE Mains.
Another important topic of Stoichiometry JEE is ‘Redox Reactions’. Problems asked from this topic in JEE are mostly of two types – identification of the type of reaction, reducing agent, oxidizing agent, and determination of oxidation state.
Stoichiometry JEE: Important Books
- Studying from best books of JEE Main and JEE Advanced is highly recommended. Some of them are listed below:
- NCERT Textbook: You should be comfortable with each and every formula of Stoichiometry given in NCERT. Most of the questions are asked directly in JEE Mains without any twists so you should mug up each and every formula.
- Numerical Chemistry by P. Bahadur: One of the best books for Stoichiometry, and has a good theory including a large number of solved examples. It has varieties of numerical problems on ‘mole concept’ and ‘equivalent concept’ which will make numerical approach very strong and hence, efficiently help you in solving questions.
- Physical Chemistry by R. C. Mukherjee: It is one of the best books for practice in JEE preparation when it comes to ‘numerical problems’. It has a good number of questions on Stoichiometry and mole concept. All the topics related to the syllabus of JEE are well covered. This book builds your concepts from very basic level to advanced level.
- To complete your preparation, you must solve the past year questions that have been asked in JEE Mains/Advanced. Refer to this book – 39 years Chapterwise Solved Paper by Arihant Publications.
Stoichiometry JEE: Important topics
- Laws of chemical combination, Mole concept, Equivalent concept, Elemental Analysis (Finding molecular and empirical formula of compound)
- Principle of Atom Conservation (POAC)
- The Limiting Reagent and The Yield of Product (Percentage Yield)
- Concentration of solution in different forms %(w/w) weight by weight, %(w/v) weight by volume, %(v/w) volume by weight, %(v/v) volume by volume.
- Concentration terms such as Molarity, Molality, Normality, Formality, Mole fraction etc.
Stoichiometry JEE: Some Basic Tips
- Don’t ever assume that if have you understood the theory part well then you will be able to solve every problem of that topic. This is because question-solving is also a part of learning the concepts well. You need not worry if you are facing problems in solving them. Just clear all your doubts from your teacher or friends and try again. You may refer theory part from any standard book such as NCERT or R. C. Mukherjee.
- Lots of practice on numerical problems will help you to overcome the fear of Stoichiometry that most of the students have. This will not only develop more interest but also help to master the theory part. Remember that without practice, it will be difficult to fully hold the concepts. Practice a variety of questions, to get the idea of the kind of problems you may get in exams.
- Cover all the topics properly. Start from easy problems and then gradually increase the level of difficulty. Try to solve by understanding the concepts behind it. Do not leave any topic, even if you feel a topic to be difficult do not leave it, instead try to learn fundamentals, definitions, concepts & formulae.
- From this chapter, the problems asked majorly include mole, mass & volume questions involving titration and the knowledge of the basic equation for titration i.e. N1V1=N2V2.
- Another important type of question that is usually asked in JEE- ‘Mixing of two solutions’ or ‘Mixing a solution and a pure component’ to get the desired concentration. Problems on calculation of atomic mass are rarely asked, but is important to ensure your complete preparation.
- The problems on volumetric and gravimetric analysis can be solved using well known knowledge of mole concept and equivalent concept. Usually, the question on gravimetric analysis is solved using mole concept since it is easier to apply in such cases while problems on volumetric analysis are solved making use of equivalent concept since it does not require the use of balanced chemical reactions. However, there is no compulsion that these guidelines should be followed. You can make use of mole concept for volumetric problems and equivalent concept for gravimetric problems as well i.e. whatever you’re comfortable in.
- You are required to know a number of redox reactions such as those of potassium dichromate, hydrogen peroxide, potassium permanganate, sulfur dioxide etc. You will be more comfortable with this chapter after completing inorganic chemistry.
- Always try to convert the given quantities into moles e.g. molecules into moles, mass into moles, concentration and volume into moles. It is always easier to solve any given problem when converted to moles.
- Balancing of Redox reactions must be understood thoroughly because sometimes it can help you to solve many problems from Stoichiometry. Oxidation states of common elements (Oxygen, Hydrogen, Fluorine, Alkali metals, Alkaline earth metals, etc.) should also be known in order to answer questions on oxidation states.
- Stoichiometry JEE is not at all going to check your mathematics skills in the chemistry paper. Unless the given options are close to each other, it is better to get an approximate answer and choose the closest option. This will help to increase your speed and also lets you save those extra crucial minutes for other important questions.