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Home › NCERT 7–12 › Class 10 › Science › Ch. 1 › All questions
Class 10 Science Chapter 1
All questions
13 Practice Questions — The answers are hidden. Reveal them to check your answers. The Timed Test will be available in Phase 3.
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All (13) MCQ (8) Short (3) Long (2) Important (11)
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Q.1 MCQ easy Important Types of reactions
A reaction in which two or more substances combine to form a single product is called a: A. Decomposition reactionB. Combination reactionC. Displacement reactionD. NeutralisationView the correct answer Correct option: B — Combination reaction
Combination (or synthesis) joins reactants into one product, e.g. C + O₂ → CO₂.
Q.2 MCQ easy Important Balancing equations
Why must a chemical equation be balanced? A. To make it look neatB. Because mass is conserved in a chemical changeC. So that heat is releasedD. Only for ionic reactionsView the correct answer Correct option: B — Because mass is conserved in a chemical change
Atoms are rearranged, not created or destroyed — atom counts on both sides must match.
Q.3 MCQ easy Types of reactions
Rusting of iron is mainly: A. A physical change onlyB. Oxidation of iron in moist airC. A displacement of waterD. PhotosynthesisView the correct answer Correct option: B — Oxidation of iron in moist air
Iron combines with oxygen (and moisture) to form hydrated iron oxide — oxidation.
Q.4 Short answer easy Important Types of reactions
Define a decomposition reaction and give one everyday example. View the correct answer A decomposition reaction splits one compound into two or more products. Example: heating limestone CaCO₃ → CaO + CO₂, or electrolysis of water.
Look for heat, light or electricity as the energy that breaks the reactant.
These practice sets use original GKSchools wording — they are not a verbatim dump of the NCERT textbook. “Important” means high-weight practice for the chapter, not a claim that these are previous-year exam questions.
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