CBSE Chemistry exam 2026: Expert-backed last-minute strategy, most expected questions and scoring tips – The Times of India

The calendar has turned, preparation hours have intensified, and the nervous quiet of pre-exam evenings has settled over classrooms. On February 28, 2026, students will sit for the Chemistry examination, a subject that often feels like a blend of logic, memory, and precision thinking.“Chemistry is not about memorising reactions; it is about understanding why molecules behave the way they do,” said Geeta Dua, Chemistry Faculty, Satya School, Gurugram, in an interaction with TOI.Ms.Kriti Tyagi, PGT Chemistry, Ryan International School, shared important questions such as Naming of coordination compounds, distinguishing test between organic compounds, ⁠Organic Name reactions, Numericals from solutions, electrochemistry, chemical kinetics, and Question based on properties of d& d block elementsThe paper follows a clearly structured pattern designed to evaluate conceptual depth and application skills. The question paper contains 33 questions with internal choice spread across five sections. According to Ms. Dua, understanding this structure is half the battle won before entering the exam hall.

Ms. Dua stressed that students should not rush through Section A. “Read each MCQ carefully. Many questions are designed as conceptual traps, especially assertion-reason questions where both statements may appear correct but are not logically connected,” she explained.

Prioritize NCERT: The foundation of success

Ms. Tyagi strongly recommended relying on NCERT textbooks. “The NCERT book is the bible for CBSE preparation,” she said, adding that students must thoroughly read theory sections, in-text questions, and exercise problems. She believes most questions are directly or indirectly derived from NCERT concepts.

First step in the exam hall: Read before writing

According to Ms.Dua, the first 10 minutes inside the examination hall can determine performance. “Students must read the full question paper calmly before starting. Identify questions you are confident about and plan time accordingly,” she said.She added that internal choices should be used strategically rather than randomly. “Attempt questions where you can present complete steps instead of attempting difficult questions in haste.”

Numerical problems: Presentation matters

For numerical questions, Ms. Dua highlighted a strict scientific writing format.“Students should always write numerical answers in a proper sequence, Given data, Formula, Substitution, and Final Answer with unit,” she said.She further explained, “Even if calculations are correct, missing units can cost marks. Examiners value scientific presentation as much as accuracy.”

Organic Chemistry: Show the full reaction

Organic Chemistry questions require detailed stepwise explanation. “Show all intermediate steps during conversions. Reagents must be written above the reaction arrow, and students should not skip intermediate compounds,” said Ms. Dua.She compared organic Chemistry to storytelling. “Organic Chemistry is like telling a story. If you skip chapters in between, the scientific logic of the reaction disappears from the answer sheet.”Students must also name reactions correctly and demonstrate mechanisms clearly. “When writing mechanisms, show electron movement using curved arrows and mention carbocation stability wherever relevant,” she advised.“Students must understand the ‘why’ and ‘how’ behind reactions rather than just memorising them,” said Ms.Tyagi. She emphasised mastering mechanisms such as SN1 and SN2 reactions.She also suggested maintaining a dedicated notebook to record:• Named reactions• Reagents• Important organic conversionsMs. Tyagi further advised students to treat Organic Chemistry as a logical process. “If you understand the mechanism, you can solve unfamiliar questions easily.”

Coordination Chemistry and Inorganic concepts

For coordination compound questions, Ms. Dua emphasised precision in nomenclature. “Write ligands in alphabetical order. Then write metal name followed by oxidation state in Roman numerals,” she said.She also highlighted conceptual areas frequently asked in d- and f-block Chemistry. “Lanthanoid contraction questions usually test cause and effect. Students must not only define it but also explain why it occurs and what consequences it produces.”“Inorganic Chemistry is all about pattern recognition,” said Ms. Tyagi. She advised students to carefully study trends in p-block elements and d- & f-block chemistry.She suggested using mnemonic devices for remembering periodic table trends and group properties. “Mnemonics help retain large amounts of information quickly,” she said.Physical Chemistry numericals often decide scoring margins. “Solve at least 10–15 numericals from chapters like Solutions, Electrochemistry, and Chemical Kinetics,” Ms. Tyagi advised. She added that consistent practice improves both speed and confidence during exams.

Case study questions: Answers are often hidden in the passage

Case-based questions often surprise students, but Ms. Dua said preparation can make them easier. “Read the passage carefully. Most answers are directly or indirectly hidden in the given information,” she noted. She advised students to underline key data points before writing answers.

Psychological strategy inside the examination hall

Mental control is as important as academic preparation. “Don’t panic if one question appears unfamiliar,” Ms. Dua advised. “Every paper contains questions that test confidence rather than memory.”She suggested students follow simple behavioural rules inside the hall:• Attempt the full paper using internal choices wisely• Write answers in points rather than long paragraphs• Maintain neat handwriting and structured presentation“Neatness creates a psychological advantage during evaluation,” she said.

Create quick revision tools: Reaction and formula sheets

Ms. Tyagi recommended preparing concise revision sheets. “Keep separate notes for chemical formulas, named reactions like Aldol and Cannizzaro reactions, and important equations,” she explained. These sheets help in last-minute revision without confusion.

Practice makes perfect: PYQs are essential

Ms. Tyagi stressed solving previous year papers as a major preparation tool. “Students should analyse at least the last 5–10 years of CBSE question papers,” she said. This helps in understanding frequently repeated topics and question styles. She added that pattern analysis is more important than merely solving questions.

Mock tests and time management

“Students must solve sample papers within a strict 3-hour time limit,” Ms. Tyagi advised. She believes mock tests help simulate real exam pressure and improve decision-making speed inside the examination hall.

Revision strategy for long-term memory

Ms. Tyagi suggested a structured revision plan. “Dedicate at least one day every week to revising previously studied chapters,” she said. Regular revision prevents information from being forgotten during final preparation stages.

Presentation skills: A silent scoring factor

“Draw clean diagrams and chemical structures,” Ms. Tyagi advised. She stressed underlining keywords in answers and clearly labeling apparatus diagrams. “Presentation creates a positive impression on examiners.”

Exam hall strategy: Smart attempting

Ms. Tyagi concluded with tactical advice for students. “Start with your strongest section. If stuck on a question, move ahead and return later,” she said. She believes this strategy reduces stress and maximises attempted marks.

High-probability numerical & conceptual questions

Ms.Tyagi has provided some important questions from different topics as mentioned here:First order reaction numericals• Time calculation for percentage completion (20% → 75% type questions)• Derivation of integrated rate equation• Proof that half-life is independent of initial concentrationMs. Tyagi emphasised practice of derivations along with numericals. “Students should not just memorise formulas but understand derivation logic,” she said.Inorganic Chemistry concept questionsLanthanoid Contraction• Definition• Causes• One consequence (such as similar atomic radii of lanthanoids)Transition Metals• Variable oxidation states• Formation of coloured ions based on d-d transitions• Why transition metals act as good catalystsMs. Tyagi explained, “Students should focus on conceptual reasoning rather than memorising properties.”Physical Chemistry Theory ApplicationsHenry’s LawExplanation of why aquatic species survive better in cold water than warm waterShe said such questions usually test real-life application of chemical laws.Electrochemistry• Working of galvanic cells (Zn–Cu type)• Calculation of EMF using Nernst Equation for non-standard concentrations“Students must practice substitution-based numerical problems,” she advised.Organic Chemistry Identification QuestionsOrganic Compound Identification (High Scoring Area)Compound A (C₈H₈O) gives:• Positive iodoform test• On oxidation with KMnO₄, forms B (C₇H₆O₂)• On heating with soda lime, gives CMs. Tyagi emphasised that students should:• Remember reagent reactions• Practice organic conversion chainsShe added, “Organic identification questions are scoring if students write complete stepwise reactions.”Other Expected Theory-Based Questions

Ms. Tyagi noted that such questions often combine theory with reasoning-based explanation.Additional Expected AreasStudents should also prepare:• Melting point comparison of Mn vs Cr• Catalyst action of transition metals• Rate law applicationsMs. Tyagi concluded, “Students who revise NCERT diagrams, mechanisms, and numerical derivations have a clear advantage in CBSE Chemistry papers.”

Common mistakes that cost marks

According to Ms.Dua, students repeatedly lose 5–8 marks due to avoidable errors.• Writing incorrect IUPAC names• Skipping intermediate steps in organic conversions• Forgetting units in numerical answers• Writing wrong oxidation numbers with incorrect signs• Drawing wrong molecular geometry, such as confusing tetrahedral and square planar structures“Examiners reward clarity. They do not want long theoretical explanations; they want scientific accuracy,” she said.