NEET Chemistry Important Questions (Most Expected) with Solutions - Download PDF

NEET Chemistry Most Expected Questions with Solutions (Based on Previous Year Trends)

Here are some important questions based on NEET trends:

Ques 1: If the molar conductivity (Λm) of a 0.050 mol L⁻¹ solution of a monobasic weak acid is 90 S cm² mol⁻¹, its degree of dissociation will be [Λ°₊ = 349.6 S cm² mol⁻¹ and Λ°₋ = 50.4 S cm² mol⁻¹]

Options:
A. 0.215
B. 0.115
C. 0.125
D. 0.225

Correct Answer: D

Explanation:
Degree of dissociation (α) = Λm / Λ°
Λ° = 349.6 + 50.4 = 400
α = 90 / 400 = 0.225

Ques 2: Given two statements:
Statement I: A diatomic molecule with bond order zero is stable.
Statement II: Bond length increases with increase in bond order.

Options:
A. Statement I is false, Statement II is true
B. Both statements are true
C. Both statements are false
D. Statement I is true, Statement II is false

Correct Answer: C

Explanation:
Bond order zero molecules are unstable, and bond length decreases as bond order increases.

Ques 3: The ratio of wavelengths absorbed by a Hydrogen atom for transitions n=2→3 and n=4→6 is:

Options:
A. 1/4
B. 1/36
C. 1/16
D. 1/9

Correct Answer: A

Explanation:
Using Rydberg relation, energy difference determines wavelength; ratio simplifies to 1/4.

Ques 4: Correct order of wavelength absorbed by complexes:
[Co(NH₃)₆]³⁺ (A), [Co(CN)₆]³⁻ (B), [Cu(H₂O)₄]²⁺ (C), [Ti(H₂O)₆]³⁺ (D)

Options:
A. C < A < D < B
B. B < D < A < C
C. B < A < D < C
D. C < D < A < B

Correct Answer: C

Explanation:
Stronger ligands cause larger splitting → absorb shorter wavelength; CN⁻ is strongest ligand.

Ques 5: If rate constant k = 0.03 s⁻¹, time required for concentration to decrease from 7.2 to 0.9 mol L⁻¹ is:

Options:
A. 21.0 s
B. 69.3 s
C. 23.1 s
D. 210 s

Correct Answer: B

Explanation:
First-order: t = 2.303/k × log (a/a₀)
t = 2.303/0.03 × log(7.2/0.9) ≈ 69.3 s

Ques 6: The standard heat of formation of Ba²⁺ is:

Options:
A. +220.5 kcal/mol
B. –128.5 kcal/mol
C. –133.0 kcal/mol
D. +133.0 kcal/mol

Correct Answer: B

Explanation:
Using Hess’s law and given enthalpy values, result = –128.5 kcal/mol.

NEET Chemistry Important Questions (Most Expected & PYQ-Based) - Download PDF

To make your NEET 2026 preparation more effective, we have compiled a high-quality PDF containing important questions from recent years.

This PDF will help you:

• Revise the most important concepts quickly

• Practice exam-level NEET MCQs

• Improve weak areas efficiently

Most Important Chapters for NEET 2026 Chemistry PYQ Practice (Based on 5-Year Trend)

To maximise your score in NEET Chemistry, you should prioritise chapters from which the highest number of PYQs have been asked. Focusing on these topics will give you the best return on your effort:

High-Yield Chapters for PYQ Practice:

• Coordination Compounds

• Hydrocarbons

• Solutions

• Chemical Bonding and Molecular Structure

• Thermodynamics

• Structure of Atom

• Organic Chemistry – Some Basic Principles and Techniques

• Chemical Kinetics

• Haloalkanes and Haloarenes

• Alcohols, Phenols and Ethers

Focusing on these chapters ensures you cover the most frequently asked concepts, helping you improve both accuracy and score potential in NEET Chemistry.

Why NEET Chemistry PYQs Are Important?

It is not enough to simply focus on concepts and theories while preparing for NEET. Previous year questions act as a bridge between concepts and performance in the actual NEET exam. Here’s how previous year questions can help you in your Chemistry preparation:

1. Understanding Exam Pattern

NEET chemistry PYQs give you a real sense of how questions.

• Help you understand the question framing style used in the actual exam

• Highlight the most repeated NEET concepts and frequently tested reactions

• Provide insight into the difficulty level and trend of questions over the years

2. Identifying High-Weightage Topics

PYQs make your preparation more focused and strategic.

• Clearly show which chapters dominate the NEET question paper

• Help identify topics that are asked again and again

• Allow you to prioritise important areas and avoid low-impact topics

3. Strengthening NCERT Concepts

NEET Chemistry is mainly based on NCERT, and PYQs help in improving concepts.

• The most important NEET questions are directly or indirectly derived from the NCERT concepts

• Help you revise important lines, reactions, and mechanisms from NCERT

• Improve your conceptual clarity instead of rote learning

4. Improving Speed and Accuracy

Regular practice with PYQs builds exam readiness.

• Helps reduce silly mistakes and negative marking

• Improves speed in solving numericals and reaction-based questions

• Builds confidence and accuracy under exam conditions

How to Use NEET Chemistry PYQs Effectively?

To get the maximum benefit from NEET Chemistry PYQs, you need to follow a structured and strategy-driven approach. Simply solving questions is not enough - what matters is how you analyse and revise them.

Chapter-wise Practice

Start your preparation by aligning PYQs with your NCERT study.

• Solve NEET PYQs chemistry immediately after completing each chapter to reinforce concepts

• Helps you understand how theoretical concepts are applied in questions

• Builds strong concept clarity and retention

Maintain an Error Notebook

Tracking mistakes is important for improvement.

• Maintain a dedicated notebook for wrong and tricky questions

• Note down confusing reactions, exceptions, and important NEET chemistry formulas

• Revise this notebook regularly to avoid repeating the same mistakes

Focus on Reaction Mechanisms

Organic Chemistry requires conceptual understanding, not memorisation.

• Focus on reaction mechanisms rather than just final products

• Practice named reactions and conversion-based questions

• Helps in solving multi-step and application-based questions easily

Revise PYQs Multiple Times

Revision is the key to mastery.

• Do not rely on one-time practice - revise PYQs at least 2–3 times

• Re-solve previously incorrect questions to strengthen weak areas

• Improves speed, accuracy, and confidence before the exam

30-Day Strategy for NEET Chemistry PYQs

With limited time left for NEET, your focus should shift to revision plus targeted PYQ practice. This 1 month NEET study plan is made to help you maximise retention, improve accuracy, and increase your Chemistry score efficiently.

Week 1: Concept + PYQ Foundation

Build a strong base by combining NCERT revision with chapter-wise PYQs.

• Revise NCERT thoroughly (especially Physical + Organic basics)

• Solve chapter-wise PYQs immediately after revision

• Focus on high-weightage NEET chemistry chapters and frequently asked concepts

• Identify weak areas and start noting them for revision

Week 2: Intensive Practice

Increase your question-solving capacity and strengthen concepts.

• Solve 70 - 100 mixed PYQs daily from different chapters

• Focus on strengthening weak topics and frequently repeated concepts

• Revise important formulas, reactions, and mechanisms daily

• Analyse each question instead of just checking answers

Week 3: Full-Length Practice

Simulate real exam conditions to improve performance.

• Attempt full-length NEET mock tests regularly

• Analyse mistakes and identify time-consuming areas

• Work on time management and question selection strategy

• Focus on improving accuracy and reducing negative marking

Week 4: Final Revision

Improve your preparation and increase confidence.

• Revise only NCERT, PYQs, and short notes

• Re-solve previously incorrect and marked questions

• Avoid starting any new topics or resources

• Keep revision light, consistent, and stress-free