BrainIt

Chemistry

Solutions

A Chemistry chapter of the NEET syllabus, and how to practise it for the computer-based exam.

Exam rules change between cycles. Confirm dates, syllabus and pattern against NTA's official site. We are not NTA.

Weightage: what the paper actually did

Solutions carried 4 questions in the NEET 2026 paper. One paper is a data point, not a destiny: NTA moves weight between chapters every cycle, which is why the weightage tables deserve care. The stable facts are the paper's shape: 180 questions, 720 marks, +4 right, −1 wrong.

Sample PYQs from this chapter

Real questions NTA asked from Solutions, with the answer and the working. Try before you peek.

Question 1 · NEET 2026

Assertion (A): For an ideal solution formed by mixing liquids P\mathbf{P} and Q\mathbf{Q}, ΔmixH=0\Delta_{mix}H = 0 and ΔmixV=0\Delta_{mix}V = 0 Reason (R): No interactions occur between P\mathbf{P} and Q\mathbf{Q} In the light of the above statements, choose the most appropriate answer from the options given below.
  1. A.Both A and R are correct and R is the correct explanation of A
  2. B.Both A and R are correct but R is NOT the correct explanation of A
  3. C.A is correct but R is not correct
  4. D.A is not correct but R is correct
Answer and explanation

Answer: C

The assertion is a defining property of an ideal solution: because the molecules pack and interact just as they did before mixing, neither heat nor volume changes on mixing. The reason misstates why. Interactions certainly DO occur between P and Q - the requirement is that the P-Q interaction be equal in strength to the P-P and Q-Q interactions it replaces, so the energy terms cancel. A solution with no intermolecular forces at all would be a gas, not a liquid mixture. NCERT Class 12, Solutions (ideal and non-ideal solutions).

Question 2 · NEET 2026

Consider the following statements about the solutions formed by mixing two liquids. Statement I: An ideal solution thus formed obeys Raoult's law throughout the composition range. Statement II: Mixture of chloroform and acetone shows negative deviation from Raoult's law. Statement III: Mixture of aniline and phenol shows positive deviation from Raoult's law.
  1. A.I and II only
  2. B.II and III only
  3. C.I only
  4. D.I and III only
Answer and explanation

Answer: A

Statement I is the definition of ideality - Raoult's law must hold over the whole composition range, not merely at the dilute ends. Statement II is correct because chloroform's C-H is acidic enough to hydrogen-bond to acetone's carbonyl oxygen, an interaction stronger than either pure liquid had, so escaping tendency drops and the deviation is negative. Statement III is wrong for the same underlying reason: aniline and phenol also form strong hydrogen bonds with each other, which gives a NEGATIVE deviation, not a positive one. NCERT Class 12, Solutions.

How to practise Solutions

Chapter by chapter, against real past-paper questions, on a screen: NEET is computer based from 2027. Read the chapter once, then attempt its PYQs until your accuracy stops climbing, and let the wrong answers tell you which lines to reread. If the chapter keeps refusing to stick, that has its own guide. There is also a free NEET mini mock with answers.

Nearby Chemistry chapters

Questions

How many questions did Solutions have in NEET 2026?

Solutions carried 4 questions in the NEET 2026 paper. Weightage shifts between cycles, so treat it as a probability, not a promise.

Where can I practise Solutions PYQs for NEET?

Explore available chapter-wise NEET practice in BrainIt, free until the 2027 exam. Review explanations and track chapter accuracy to guide your revision. Sample questions from this chapter are on this page.

Is Solutions important for NEET 2027?

It is part of the Chemistry syllabus the paper draws from, and NEET 2027 is computer based, so practise it on a screen. Your own accuracy in the chapter matters more than any weightage table: a heavy chapter you already score well on needs less time than a light one you keep missing.

Something here wrong or out of date? Email hello@brainit.pro and a person will read it.