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Chemical Reactions and Equations Class 10 Foundation MCQ & Practice Questions

Practice Chemical Reactions and Equations MCQs for Class 10 Foundation Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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Chemical Reactions and Equations Revision Guide for Class 10 Foundation Chemistry

Chemical Reactions and Equations is part of Class 10 Foundation Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

Use the sample MCQs on this page to check understanding, then attempt the related ChemNexa tests for broader practice. When an answer is wrong, review the explanation and return to the underlying concept before attempting another set.

Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

Revision Tip

Create a one-page summary of trends, structures, reactions, exceptions and key terminology for Chemical Reactions and Equations, then test recall with mixed MCQs.

What to practise in Chemical Reactions and Equations

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Chemical Reactions and Equations before attempting MCQs.

Exam-style MCQs

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for Class 10 Foundation Chemistry.

Performance Practice

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Top 20 Chemical Reactions and Equations MCQs with Answers

These public questions are selected from the exact Chemical Reactions and Equations chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

1. Which coefficient set correctly balances FeS₂ + O₂ → Fe₂O₃ + SO₂?

  • A. 4, 11, 2, 8
  • B. 2, 5, 1, 4
  • C. 4, 9, 2, 8
  • D. 2, 7, 1, 4
Answer: A
Explanation: The balanced equation is 4FeS₂ + 11O₂ → 2Fe₂O₃ + 8SO₂.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

2. In 2KClO₃ → 2KCl + 3O₂, how many moles of O₂ are produced from 4 moles of KClO₃?

  • A. 3 mol
  • B. 4 mol
  • C. 6 mol
  • D. 8 mol
Answer: C
Explanation: The mole ratio is 2:3, so 4 mol KClO₃ gives 6 mol O₂.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

3. Which reaction is both a combination and a redox reaction?

  • A. CaO + H₂O → Ca(OH)₂
  • B. HCl + NaOH → NaCl + H₂O
  • C. 2Mg + O₂ → 2MgO
  • D. AgNO₃ + NaCl → AgCl + NaNO₃
Answer: C
Explanation: Mg is oxidised and oxygen is reduced while a single product forms.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

4. Which reaction is not a redox reaction?

  • A. Zn + CuSO₄ → ZnSO₄ + Cu
  • B. CuO + H₂ → Cu + H₂O
  • C. HCl + NaOH → NaCl + H₂O
  • D. 2Mg + O₂ → 2MgO
Answer: C
Explanation: No oxidation number changes in neutralisation.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

5. In MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O, the oxidising agent is

  • A. HCl
  • B. Cl⁻
  • C. MnO₂
  • D. MnCl₂
Answer: C
Explanation: MnO₂ is reduced from Mn(+4) to Mn(+2).

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

6. In the same reaction, chloride ions undergo

  • A. Reduction
  • B. Oxidation
  • C. Neutralisation
  • D. Hydrolysis
Answer: B
Explanation: Cl⁻ changes from −1 to 0 in Cl₂.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

7. Which observation most strongly proves a chemical reaction?

  • A. Ice melting
  • B. Water boiling
  • C. A permanent precipitate appears
  • D. Salt dissolves
Answer: C
Explanation: A precipitate is a new substance.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

8. Pb(NO₃)₂ + 2KI gives a yellow precipitate of

  • A. PbO
  • B. KNO₃
  • C. PbI₂
  • D. I₂
Answer: C
Explanation: PbI₂ is yellow.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

9. The net ionic equation for strong acid–strong base neutralisation is

  • A. H⁺ + Cl⁻ → HCl
  • B. Na⁺ + OH⁻ → NaOH
  • C. H⁺ + OH⁻ → H₂O
  • D. H₂ + O₂ → H₂O
Answer: C
Explanation: Spectator ions cancel.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

10. A metal displaces Cu from CuSO₄ but not Zn from ZnSO₄. It could be

  • A. Ag
  • B. Fe
  • C. Na
  • D. Au
Answer: B
Explanation: Iron lies between zinc and copper in the reactivity series.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

11. Which reaction occurs spontaneously?

  • A. Cu + ZnSO₄ → CuSO₄ + Zn
  • B. Ag + NaCl → AgCl + Na
  • C. Zn + CuSO₄ → ZnSO₄ + Cu
  • D. Au + FeSO₄ → Au₂SO₄ + Fe
Answer: C
Explanation: Zinc is more reactive than copper.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

12. The brown fumes from heating Pb(NO₃)₂ are

  • A. NO
  • B. NO₂
  • C. N₂O
  • D. Cl₂
Answer: B
Explanation: Lead nitrate gives NO₂ and O₂.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

13. Which is photochemical decomposition?

  • A. CaCO₃ → CaO + CO₂
  • B. 2AgCl → 2Ag + Cl₂
  • C. 2H₂O → 2H₂ + O₂ by electricity
  • D. 2KClO₃ → 2KCl + 3O₂
Answer: B
Explanation: AgCl decomposes in light.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

14. Electrolysis of water is

  • A. Combination
  • B. Electrolytic decomposition
  • C. Displacement
  • D. Precipitation
Answer: B
Explanation: Electricity decomposes water.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

15. An exothermic reaction

  • A. Absorbs heat
  • B. Releases heat
  • C. Has zero activation energy
  • D. Always needs light
Answer: B
Explanation: Heat flows to surroundings.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

16. Respiration is exothermic because

  • A. Glucose forms
  • B. Glucose oxidation releases energy
  • C. Oxygen forms
  • D. Water decomposes
Answer: B
Explanation: Energy is released.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

17. Which process is endothermic?

  • A. Methane combustion
  • B. Neutralisation
  • C. CaCO₃ thermal decomposition
  • D. Respiration
Answer: C
Explanation: Heat is absorbed to break down CaCO₃.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

18. In CuO + H₂ → Cu + H₂O

  • A. CuO oxidised, H₂ reduced
  • B. CuO reduced, H₂ oxidised
  • C. Both reduced
  • D. No redox
Answer: B
Explanation: CuO loses oxygen; H₂ gains oxygen.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

19. Why is mass conserved in a closed reaction?

  • A. Atoms are rearranged, not created or destroyed
  • B. Molecules never move
  • C. Energy becomes mass
  • D. Products weigh less
Answer: A
Explanation: The number of each kind of atom remains unchanged.

Class 10 Foundation Chemistry · Chemical Reactions and Equations · Very Very Hard

20. A balanced equation is essential because it

  • A. Shows speed
  • B. Shows atom conservation and mole ratios
  • C. Proves reversibility
  • D. Gives activation energy
Answer: B
Explanation: Coefficients conserve atoms and give stoichiometric ratios.

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Chemical Reactions and Equations Practice Tests

Chemical Reactions and Equations Frequently Asked Questions

How should I prepare Chemical Reactions and Equations for Class 10 Foundation Chemistry?

Revise the core concepts first, make a short list of important relationships or exceptions, and then solve chapter-focused MCQs while reviewing every error.

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What should I do after getting an MCQ wrong?

Identify whether the mistake came from a concept gap, calculation, unit, sign, wording or memory error, review that point, and then attempt a similar question again.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

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