solve rate of appearance and disappearance without solving

This video is meant to just help you guys out with Prediction of rate of reaction ,rate of disappearance of reactant & rate of appearance of product in case you're stuck and you only have a few minutes left and have nothing to lose and no time to go through the mechanisms to make sure your answer is right. In this video I show the shortest trick to solve it.

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The best books that can be referred to, for JEE Mains and Advanced for preparation in Physics, Chemistry and Mathematics.
Physics:

Chemistry :

Mathematics

Additionally, to complete your preparation, you must solve the past year JEE papers:

Besides, if you are looking for general preparation guidance, you can have a look at the following:

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