CET Delhi Polytechnic 2026 Chemistry: Key Chapters Revision Guide

CET Delhi Polytechnic 2026 exam is scheduled for June 28, 2026 — here are the most important Chemistry chapters and last-week revision tips to help you score maximum marks in the Science section.

With the CET Delhi Polytechnic 2026 exam just around the corner, focused revision of high-weightage Chemistry chapters can make a significant difference to your final score. The Chemistry section is part of the Science paper and tests Class 10-level concepts. Knowing which chapters carry more questions lets you prioritise your study time wisely in the final days before the exam.

• CET Delhi Polytechnic 2026 exam date: June 28, 2026
• Chemistry is part of the Science section, which typically carries 25 marks based on previous year patterns
• Chemical Reactions and Equations, Acids Bases and Salts, Metals and Non-Metals, and Carbon and its Compounds are the highest-weightage chapters based on previous year trends
• Focus on reaction types, pH concepts, the reactivity series, and functional groups for last-minute revision
• Visit the official portal at tte.delhi.gov.in for admit card download and exam-day instructions

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Chemistry Chapter Weightage in CET Delhi Polytechnic 2026

Based on previous year papers, the Chemistry section of CET Delhi Polytechnic covers Class 10 CBSE topics. The table below shows the expected question distribution per chapter based on 2024 and 2025 trends. Use this to decide how much time to give each chapter.

Actual question counts may vary in the 2026 paper. The four high-priority chapters together typically account for over 60% of Chemistry questions based on previous year trends.

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High Priority Chapters for Last-Week Revision

1. Chemical Reactions and Equations

This chapter consistently carries the most questions in the Chemistry section. Focus on these areas in your revision:

• Types of chemical reactions — combination, decomposition, displacement, double displacement, and redox, with one example each
• Balancing chemical equations using the hit-and-trial method — practice at least 5 equations
• Signs of a chemical reaction — gas evolution, precipitate formation, colour change, and heat exchange
• Real-life reactions: corrosion (rusting of iron) and rancidity (oxidation of fats in food)

2. Acids, Bases and Salts

One of the most concept-dense chapters in the paper. Revise these key points for quick marks:

• pH scale — acids (pH less than 7), neutral (pH = 7), bases (pH greater than 7); universal indicator colours
• Reactions of acids and bases with metals, metal oxides, and metal carbonates — write the product for each
• Indicators — litmus (red in acid, blue in base), phenolphthalein (colourless in acid, pink in base), methyl orange
• Preparation and uses of baking soda (NaHCO3), washing soda (Na2CO3), bleaching powder, and plaster of Paris
• Chlor-alkali process: products are NaOH, chlorine gas, and hydrogen gas

3. Metals and Non-Metals

Expect 3–4 questions from this chapter based on previous year trends. Revise these topics:

• Reactivity series — order from potassium (most reactive) to gold (least reactive), and how it predicts displacement reactions
• Physical and chemical properties of metals versus non-metals — malleability, conductivity, reaction with oxygen and water
• Extraction of metals — meaning of ore, gangue, flux, slag, and the step-by-step refining process
• Ionic bond formation between metals and non-metals and properties of electrovalent compounds
• Corrosion of iron (rusting) and prevention by galvanisation, alloying, and painting

4. Carbon and its Compounds

Organic chemistry basics form a significant portion of the paper. Focus on these points:

• Covalent bonding in carbon — single, double, and triple bonds with structural examples
• Homologous series — alkanes (CnH2n+2), alkenes (CnH2n), alkynes (CnH2n-2), alcohols, and carboxylic acids with their general formulae
• Functional groups — alcohol (–OH), aldehyde (–CHO), ketone (C=O), carboxylic acid (–COOH): know the name, formula, and one example
• Properties and uses of ethanol (C2H5OH) and ethanoic acid (CH3COOH)
• Saponification reaction (soap making) and the cleansing action of soap in hard and soft water
• Difference between saturated and unsaturated hydrocarbons and why unsaturated fats are healthier

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Moderate Priority Chapters

5. Periodic Classification of Elements

Revise these key concepts in under 30 minutes for 2–3 easy marks:

• Mendeleev’s Periodic Table — merits (predicted undiscovered elements, eka-aluminium and eka-silicon) and limitations (position of hydrogen, isotopes not accommodated)
• Modern Periodic Law: properties of elements are a periodic function of their atomic number
• Trends across a period — atomic size decreases, metallic character decreases, non-metallic character increases, and valency rises then falls
• Trends down a group — atomic size increases, metallic character increases

6. Atomic Structure

• Bohr’s model — electron shells K, L, M, N and their maximum electron capacity (2n²): K holds 2, L holds 8, M holds 18
• Electronic configuration of elements from hydrogen (1) to calcium (20) — write these from memory
• Valence electrons determine an element’s chemical reactivity and bonding behaviour
• Definitions and one example each: isotopes (same atomic number, different mass number), isobars (same mass number, different atomic number), isotones (same neutron number)

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Last-Week Revision Strategy for CET Delhi Polytechnic 2026 Chemistry

With the exam on June 28, 2026, use the day-wise plan below to cover all Chemistry chapters without last-minute panic:

Focus on formulae, reaction types, and key definitions during last-minute revision rather than lengthy derivations. Solving previous year Chemistry questions topic-by-topic is the fastest way to identify weak areas. Do not start any new chapter after Day 5.

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