Stop Revising. Start Scoring.
Sections 1 to 18 taught the chapter. They gave you the equilibrium constant and the rules that reverse, scale and add it, the to conversion through , heterogeneous equilibria, the reaction quotient, Le Chatelier's principle with the inert-gas trap, the Arrhenius, Bronsted-Lowry and Lewis definitions, conjugate pairs, the pH scale, and , Ostwald's dilution law, hydrolysis of the four salt types, buffers and the solubility product. Section 18 compressed all of it into the recall cards NEET actually draws from.
This section finds out whether you can use any of that at NEET speed.
The gap between knowing and scoring is where the marks go. A student who can state still writes for ammonia synthesis in the third minute of a paper. A student who has written Henderson-Hasselbalch out fifty times still puts acid over salt when the clock is running. The only way to find your own version of that gap is to sit a full timed set and then read what you got wrong.
Key Point: Sit with a blank sheet, a pen and a timer. Attempt all 30 questions in one unbroken sitting, writing a choice for every question you attempt, and do not look at a single explanation until the last question is done. An explanation read halfway through turns a diagnostic test into a reading exercise, and a reading exercise tells you nothing about what you can do under pressure.
| The setup | What it is |
|---|---|
| Number of questions | 30, four options each, single correct, drawn from the whole chapter |
| Marking scheme | for a correct answer, for an incorrect answer, for a question left unattempted |
| Maximum score | |
| Minimum possible score | , if all thirty are attempted and all thirty are wrong |
| Suggested time limit | 35 minutes, which is 70 seconds a question |
| Allowed | A rough sheet, a pen, and the constants and at 298 K |
| Not allowed | A calculator, log tables, a formula sheet, and turning back to any earlier section while the timer runs |
No tables are allowed, so carry these log values in your head: , , , . Almost every pH answer in this set lands on one of those.
[NEET] Seventy seconds a question is the whole discipline. A NEET equilibrium question is meant to be answered from a written expression, not from a full calculation, so if you are still setting up algebra at forty seconds you have misread the question. Mark it, move on, and come back with whatever minutes are left at the end. The commonest way to lose twenty marks on this chapter is to spend six minutes forcing a quadratic that a approximation would have finished in fifteen seconds.
[NEET] On an assertion-reason question, decide three things in this order and never merge them: is the assertion true on its own, is the reason true on its own, and only then, does the reason actually explain the assertion. Most wrong answers here come from students who see two true sentences about the same reaction and mark them as explaining each other. Two true statements sitting side by side are not a cause and its effect. The same discipline applies to the statement-type questions: judge Statement I and Statement II separately before you look at the options at all.
How to mark yourself
Apply the scheme exactly: , , . Do not award yourself a question you would have got right with another thirty seconds, and do not write off a sign error on as carelessness. A sign error on is a concept error wearing a disguise.
| Score out of 120 | Where you stand | What to do next |
|---|---|---|
| and above | Chapter is exam-ready | Work only on speed. Resit the set in 28 minutes |
| to | Strong, with two or three leaking topics | Trace each wrong answer to its tag and redo the worked items in that section |
| to | Concepts present, application shaky | Rebuild the ionic-equilibrium half. Most of the loss sits between , , hydrolysis and buffers |
| to | Recognition without command | Reread sections 8, 11, 13 and 14, then resit this set cold after a week |
| Below | The chapter has not landed | Go back to section 1 and work forward. Resitting now only teaches you the answer key |
A total near zero almost always means over-attempting rather than not knowing. Count your attempts. If you attempted twenty-eight and scored under fifty, the fix is selection, not content: a question narrowed to two options is worth attempting, because a coin flip between two returns on average, while a blind guess among four returns and costs you the seventy seconds you spent getting there.
Now sort the wrong answers by topic, using the tags on each explanation. Six wrong answers spread across six topics is an arithmetic problem and a week of practice fixes it. Six wrong answers all sitting in hydrolysis and buffers is a hole in the concept, and no volume of extra questions will fill it until you go back and reread that section.
One separate count matters more than the rest. Look only at the assertion-reason questions and the statement-type questions and count your mistakes there. If two or more of your errors fall in those two formats, the problem is not chemistry, it is format. You are reading a true sentence and a true sentence and marking them as connected, or you are letting a false reason drag a true assertion down with it. Fix that by rewriting each of those questions as three separate yes-or-no lines on your rough sheet before choosing, and the marks come back without learning any new chemistry.
Finally, mark every question you got right by elimination rather than by working. Those are the ones that turn into wrong answers when the same idea reappears with different numbers.