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Home › NCERT 7–12 › Class 10 › Science › Ch. 1 › MCQ
Class 10 Science Chapter 1
MCQ
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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Easy Medium Hard
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 medium Important Types of reactions
Heating of lead nitrate crystals that give brown fumes is an example of: A. CombinationB. DisplacementC. Thermal decompositionD. Double displacementView the correct answer Correct option: C — Thermal decomposition
Heat splits lead nitrate into oxide, nitrogen dioxide and oxygen — thermal decomposition.
Q.3 MCQ medium Important Types of reactions
When zinc is dipped in copper sulphate solution, copper metal is deposited. This is: A. CombinationB. DisplacementC. Redox only, not displacementD. NeutralisationView the correct answer Correct option: B — Displacement
More reactive zinc displaces copper from CuSO₄. It is also a redox change.
Q.4 MCQ medium Important Oxidation and reduction
In 2Mg + O₂ → 2MgO, magnesium is: A. ReducedB. OxidisedC. Neither oxidised nor reducedD. PrecipitatedView the correct answer Correct option: B — Oxidised
Magnesium gains oxygen (and loses electrons) so it is oxidised.
Q.5 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.6 MCQ hard Important Types of reactions
BaCl₂ + Na₂SO₄ → BaSO₄↓ + 2NaCl is best classified as: A. CombinationB. DecompositionC. DisplacementD. Double displacement (precipitation)View the correct answer Correct option: D — Double displacement (precipitation)
Ions exchange partners and BaSO₄ comes out as a precipitate.
Q.7 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.8 MCQ medium Balancing equations
The balanced form of H₂ + O₂ → H₂O is: A. H₂ + O₂ → H₂OB. 2H₂ + O₂ → 2H₂OC. H₂ + 2O₂ → H₂OD. 2H₂ + 2O₂ → H₂OView the correct answer Correct option: B — 2H₂ + O₂ → 2H₂O
Two H₂ molecules need one O₂ to make two water molecules.
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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