CBSE · Board years

CBSE Class 10 — Notes, Chapters & Practice Quizzes

Your Class 10 year, organised — chapter notes, board-style questions and a practice quiz for every chapter.

7 subjects 143 chapters 149 practice quizzes NCERT syllabus
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Maths · Quadratic equations · 9 formulae in the cheatsheet
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sin²θ means (sinθ)², not sin(θ²). A pure notation trap that changes the value.

Class 10 Science — Chapter-wise Notes & Quizzes

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Science · 13 chapters
Summary, key terms, extra questions with answers and a practice quiz with AI diagnosis for each.

Chapter 1: Chemical Reactions and EquationsClass 10 Science — summary, notes, extra questions & NCERT solutions

Try one from this chapter
A chemical equation is balanced to satisfy which law?

Summary

Chemical reactions remake substances: bonds in the reactants break and new bonds form, producing products with new properties. A chemical equation is the shorthand for that change, and it must be balanced so that every element has the same number of atoms on both sides — a direct consequence of the law of conservation of mass. Reactions are grouped by what happens to the substances: combination (reactants join into one product), decomposition (one substance splits into many under heat, light or electricity), displacement (a more reactive element pushes out a less reactive one) and double displacement (two compounds exchange ions, often forming a precipitate). Many reactions are redox reactions, where oxidation and reduction happen together. Everyday processes like the rusting of iron (corrosion) and the spoiling of fried food (rancidity) are slow oxidation reactions you can learn to recognise and prevent.

Chemical equations and balancingCombination and decomposition reactionsDisplacement and double displacementOxidation and reduction (redox)Corrosion and rancidity

Key terms

Balanced equation
An equation with equal atoms of each element on both sides.
Combination reaction
Two or more reactants form a single product.
Decomposition reaction
A single reactant breaks into two or more products.
Redox reaction
Oxidation and reduction occurring simultaneously.

Extra questions & answers

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Activity 1.11

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Balanced equation
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An equation with equal atoms of each element on both sides.
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Practice quiz · Chemical Reactions and Equations

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Chemical Reactions and Equations

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Science 10 Qs · ~10 min

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Chemical Reactions and Equations Fundamentals — Free CBSE Class 10 Board Examination Quiz

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Your Class 10 board-year rhythm

  1. 1A student studying at home in the evening

    A little every day

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  2. 2Students writing an exam in a bright hall

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  3. 3A family celebrating a result

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