Chemical Reactions and Equations Practice Questions

Class 10 · Science · 2805 free MCQs with instant results and detailed explanations.

2805

Total

944

Easy

1372

Medium

489

Hard

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Topics in Chemical Reactions and Equations

Balancing Equations 790

Types of Chemical Reactions 1056

Oxidation and Reduction 959

Sample Questions from Chemical Reactions and Equations

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Easy

What is the balanced equation for the combustion of methane (CH4)?

A. CH4 + 2O2 → CO2 + 2H2O

B. CH4 + O2 → CO + H2O

C. CH4 + O2 → CO2 + H2

D. CH4 + 3O2 → 2CO2 + 2H2O

Show Answer & Explanation

Correct Answer: A

The complete combustion of methane involves one molecule of methane reacting with two molecules of oxygen to produce carbon dioxide and water.

Easy

Which of the following represents a balanced equation for the reaction of zinc with hydrochloric acid?

A. Zn + 2HCl → ZnCl2 + H2

B. Zn + HCl → ZnCl + H2

C. 2Zn + 2HCl → 2ZnCl2 + H2

D. Zn + 4HCl → ZnCl2 + 2H2

Show Answer & Explanation

Correct Answer: A

The balanced equation shows that one zinc atom reacts with two hydrochloric acid molecules to produce zinc chloride and hydrogen gas.

Easy

In the reaction 2Na + Cl2 → 2NaCl, what role does chlorine play?

A. Reducing agent

B. Oxidizing agent

C. Catalyst

D. Inert gas

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Correct Answer: B

Chlorine gains electrons from sodium, thus it acts as an oxidizing agent.

Medium

Which type of reaction is represented by the equation: 2H₂ + O₂ → 2H₂O?

A. Synthesis Reaction

B. Decomposition Reaction

C. Single Replacement

D. Double Replacement

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Correct Answer: A

This reaction combines hydrogen and oxygen to form water, classifying it as a synthesis reaction.

Medium

What is the main characteristic of a decomposition reaction?

A. Formation of a single product

B. Breaking down of a compound

C. Involves two reactants

D. Produces gas only

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Correct Answer: B

In a decomposition reaction, a single compound breaks down into two or more simpler substances.

Medium

Which of the following is an example of a double replacement reaction?

A. AgNO₃ + NaCl → AgCl + NaNO₃

B. CaCO₃ → CaO + CO₂

C. Zn + CuSO₄ → ZnSO₄ + Cu

D. 2H₂O₂ → 2H₂O + O₂

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Correct Answer: A

This reaction involves the exchange of ions between two compounds, characteristic of double replacement reactions.

Medium

Which equation represents a combustion reaction?

A. C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

B. NaOH + HCl → NaCl + H₂O

C. Fe₂O₃ → 2Fe + 3O₂

D. Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O

Show Answer & Explanation

Correct Answer: A

Combustion reactions involve a hydrocarbon reacting with oxygen to produce carbon dioxide and water.

Hard

Which of the following equations represents a balanced chemical reaction?

A. 2H₂ + O₂ → 2H₂O

B. H₂ + O₂ → H₂O

C. C + O₂ → CO₂ + H₂O

D. 3Fe + 2O₂ → Fe₂O₃

Show Answer & Explanation

Correct Answer: A

The equation 2H₂ + O₂ → 2H₂O has the same number of each type of atom on both sides, making it balanced.

Hard

In the combustion of ethanol (C₂H₅OH), what is the resulting balanced equation?

A. C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

B. C₂H₅OH + 2O₂ → 2CO₂ + H₂O

C. C₂H₅OH + 5O₂ → 2CO₂ + 3H₂O

D. C₂H₅OH + O₂ → CO₂ + H₂O

Show Answer & Explanation

Correct Answer: A

The reaction requires 3 O₂ to produce 2 molecules of CO₂ and 3 molecules of H₂O, correctly balancing all atoms.

Q10

Hard

Which of the following is the correct balanced equation for the reaction of aluminum with hydrochloric acid?

A. 2Al + 6HCl → 2AlCl₃ + 3H₂

B. 2Al + 3HCl → 2AlCl + 3H₂

C. Al + 3HCl → AlCl₃ + 1.5H₂

D. Al + 6HCl → AlCl₃ + 3H₂

Show Answer & Explanation

Correct Answer: A

The balanced equation is 2Al + 6HCl → 2AlCl₃ + 3H₂, where all atoms are equal on both sides.

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Chemical Reactions and Equations — Class 10 Science Practice Questions Online

This page contains 2805 practice MCQs for the chapter Chemical Reactions and Equations in Class 10 Science. The questions are organized by difficulty — 944 easy, 1372 medium, 489 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 3 topics, giving you comprehensive coverage of the entire chapter.