Class 10 Science Chemical Reactions and Equations Revision Questions
Revision Questions for Class 10 Science Chemical Reactions and Equations. Try first, then reveal the answer. These are exam-oriented practice items, not copied board papers.
Practice questions aligned to NCERT topics used in CBSE classrooms. These are original exam-oriented questions for revision — not official CBSE board papers and not a guarantee of any exam question. Always match the textbook issued by your school and the latest PDFs on ncert.nic.in and cbseacademic.nic.in.
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Practice set
Q1MCQ1 markEasyRevision pick
Choose the correct statement related to Balanced equation in the chapter Chemical Reactions and Equations.
A. An exothermic reaction releases heat to the surroundings
B. A decomposition reaction splits one compound into two or more products, often with heat, light or electricity
C. Mass need not be conserved
D. A balanced chemical equation has the same number of atoms of each element on both sides
Answer
D. A balanced chemical equation has the same number of atoms of each element on both sides
Explanation
A balanced chemical equation has the same number of atoms of each element on both sides. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q2MCQ1 markEasy
Choose the correct statement related to Combination reaction in the chapter Chemical Reactions and Equations.
A. In a combination reaction two or more substances join to form a single product
B. A more reactive metal can displace a less reactive metal from its salt solution
C. An endothermic reaction absorbs heat from the surroundings
D. Combination, decomposition, displacement, double displacement
Answer
A. In a combination reaction two or more substances join to form a single product
Explanation
In a combination reaction two or more substances join to form a single product. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q3MCQ1 markEasy
Choose the correct statement related to Decomposition in the chapter Chemical Reactions and Equations.
A. A precipitate is an insoluble solid formed in a double-displacement reaction
B. A decomposition reaction splits one compound into two or more products, often with heat, light or electricity
C. Oxidation and reduction occur together in a redox reaction
D. Redox: oxidation is gain of oxygen or loss of electrons as taught
Answer
B. A decomposition reaction splits one compound into two or more products, often with heat, light or electricity
Explanation
A decomposition reaction splits one compound into two or more products, often with heat, light or electricity. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q4MCQ1 markEasy
Choose the correct statement related to Displacement in the chapter Chemical Reactions and Equations.
A. A more reactive metal can displace a less reactive metal from its salt solution
B. An exothermic reaction releases heat to the surroundings
C. Exothermic vs endothermic
D. A chemical equation must be balanced for mass
Answer
A. A more reactive metal can displace a less reactive metal from its salt solution
Explanation
A more reactive metal can displace a less reactive metal from its salt solution. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q5MCQ1 markModerateRevision pick
Choose the correct statement related to Redox in the chapter Chemical Reactions and Equations.
A. Combination, decomposition, displacement, double displacement
B. Precipitation reactions
C. Oxidation and reduction occur together in a redox reaction
D. An endothermic reaction absorbs heat from the surroundings
Answer
C. Oxidation and reduction occur together in a redox reaction
Explanation
Oxidation and reduction occur together in a redox reaction. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q6MCQ1 markEasy
Choose the correct statement related to Exothermic in the chapter Chemical Reactions and Equations.
A. Redox: oxidation is gain of oxygen or loss of electrons as taught
B. A precipitate is an insoluble solid formed in a double-displacement reaction
C. This idea is not part of the NCERT chapter
D. An exothermic reaction releases heat to the surroundings
Answer
D. An exothermic reaction releases heat to the surroundings
Explanation
An exothermic reaction releases heat to the surroundings. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q7MCQ1 markEasy
Choose the correct statement related to Endothermic in the chapter Chemical Reactions and Equations.
A. An endothermic reaction absorbs heat from the surroundings
B. The textbook says the opposite of this statement
C. A chemical equation must be balanced for mass
D. Exothermic vs endothermic
Answer
A. An endothermic reaction absorbs heat from the surroundings
Explanation
An endothermic reaction absorbs heat from the surroundings. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q8MCQ1 markEasy
Choose the correct statement related to Precipitation in the chapter Chemical Reactions and Equations.
A. Precipitation reactions
B. This happens only in a laboratory and never in daily life
C. A precipitate is an insoluble solid formed in a double-displacement reaction
D. Combination, decomposition, displacement, double displacement
Answer
C. A precipitate is an insoluble solid formed in a double-displacement reaction
Explanation
A precipitate is an insoluble solid formed in a double-displacement reaction. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q9MCQ1 markEasyRevision pick
Choose the correct statement related to Chemical Reactions and Equations in the chapter Chemical Reactions and Equations.
A. A chemical equation must be balanced for mass
B. A balanced chemical equation has the same number of atoms of each element on both sides
C. Redox: oxidation is gain of oxygen or loss of electrons as taught
D. This idea is not part of the NCERT chapter
Answer
A. A chemical equation must be balanced for mass
Explanation
A chemical equation must be balanced for mass. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q10MCQ1 markModerate
Choose the correct statement related to Chemical Reactions and Equations in the chapter Chemical Reactions and Equations.
A. The textbook says the opposite of this statement
B. Combination, decomposition, displacement, double displacement
C. In a combination reaction two or more substances join to form a single product
D. Exothermic vs endothermic
Answer
B. Combination, decomposition, displacement, double displacement
Explanation
Combination, decomposition, displacement, double displacement. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q11MCQ1 markEasy
Choose the correct statement related to Redox in the chapter Chemical Reactions and Equations.
A. Precipitation reactions
B. Redox: oxidation is gain of oxygen or loss of electrons as taught
C. A decomposition reaction splits one compound into two or more products, often with heat, light or electricity
D. This happens only in a laboratory and never in daily life
Answer
B. Redox: oxidation is gain of oxygen or loss of electrons as taught
Explanation
Redox: oxidation is gain of oxygen or loss of electrons as taught. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q12MCQ1 markEasy
Choose the correct statement related to Chemical Reactions and Equations in the chapter Chemical Reactions and Equations.
A. A more reactive metal can displace a less reactive metal from its salt solution
B. This idea is not part of the NCERT chapter
C. A balanced chemical equation has the same number of atoms of each element on both sides
D. Exothermic vs endothermic
Answer
D. Exothermic vs endothermic
Explanation
Exothermic vs endothermic. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q13MCQ1 markEasyRevision pick
Choose the correct statement related to Chemical Reactions and Equations in the chapter Chemical Reactions and Equations.
A. In a combination reaction two or more substances join to form a single product
B. The textbook says the opposite of this statement
C. Oxidation and reduction occur together in a redox reaction
D. Precipitation reactions
Answer
D. Precipitation reactions
Explanation
Precipitation reactions. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q14MCQ1 markEasy
Choose the correct statement related to Balanced equation in the chapter Chemical Reactions and Equations.
A. Precipitation reactions
B. This happens only in a laboratory and never in daily life
C. A balanced chemical equation has the same number of atoms of each element on both sides
D. A skeleton equation is already balanced
Answer
C. A balanced chemical equation has the same number of atoms of each element on both sides
Explanation
A balanced chemical equation has the same number of atoms of each element on both sides. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q15MCQ1 markModerate
Choose the correct statement related to Combination reaction in the chapter Chemical Reactions and Equations.
A. A precipitate is an insoluble solid formed in a double-displacement reaction
B. Oxidation and reduction occur together in a redox reaction
C. In a combination reaction two or more substances join to form a single product
D. A balanced chemical equation has the same number of atoms of each element on both sides
Answer
C. In a combination reaction two or more substances join to form a single product
Explanation
In a combination reaction two or more substances join to form a single product. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q16MCQ1 markEasy
Choose the correct statement related to Decomposition in the chapter Chemical Reactions and Equations.
A. In a combination reaction two or more substances join to form a single product
B. An exothermic reaction releases heat to the surroundings
C. A chemical equation must be balanced for mass
D. A decomposition reaction splits one compound into two or more products, often with heat, light or electricity
Answer
D. A decomposition reaction splits one compound into two or more products, often with heat, light or electricity
Explanation
A decomposition reaction splits one compound into two or more products, often with heat, light or electricity. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q17MCQ1 markEasyRevision pick
Choose the correct statement related to Displacement in the chapter Chemical Reactions and Equations.
A. A decomposition reaction splits one compound into two or more products, often with heat, light or electricity
B. A more reactive metal can displace a less reactive metal from its salt solution
C. Combination, decomposition, displacement, double displacement
D. An endothermic reaction absorbs heat from the surroundings
Answer
B. A more reactive metal can displace a less reactive metal from its salt solution
Explanation
A more reactive metal can displace a less reactive metal from its salt solution. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q18MCQ1 markEasy
Choose the correct statement related to Redox in the chapter Chemical Reactions and Equations.
A. A precipitate is an insoluble solid formed in a double-displacement reaction
B. Redox: oxidation is gain of oxygen or loss of electrons as taught
C. Oxidation and reduction occur together in a redox reaction
D. A more reactive metal can displace a less reactive metal from its salt solution
Answer
C. Oxidation and reduction occur together in a redox reaction
Explanation
Oxidation and reduction occur together in a redox reaction. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q19MCQ1 markEasy
Choose the correct statement related to Exothermic in the chapter Chemical Reactions and Equations.
A. Oxidation and reduction occur together in a redox reaction
B. A chemical equation must be balanced for mass
C. Exothermic vs endothermic
D. An exothermic reaction releases heat to the surroundings
Answer
D. An exothermic reaction releases heat to the surroundings
Explanation
An exothermic reaction releases heat to the surroundings. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q20MCQ1 markModerate
Choose the correct statement related to Endothermic in the chapter Chemical Reactions and Equations.
A. An endothermic reaction absorbs heat from the surroundings
B. Precipitation reactions
C. An exothermic reaction releases heat to the surroundings
D. Combination, decomposition, displacement, double displacement
Answer
A. An endothermic reaction absorbs heat from the surroundings
Explanation
An endothermic reaction absorbs heat from the surroundings. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q211 Mark1 markEasy
Define or state: Precipitation.
Answer
A precipitate is an insoluble solid formed in a double-displacement reaction.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q221 Mark1 markEasy
Define or state: Chemical Reactions and Equations.
Answer
A chemical equation must be balanced for mass.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q231 Mark1 markEasy
Define or state: Chemical Reactions and Equations.
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q241 Mark1 markEasy
Define or state: Redox.
Answer
Redox: oxidation is gain of oxygen or loss of electrons as taught.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q251 Mark1 markModerate
Define or state: Chemical Reactions and Equations.
Answer
Exothermic vs endothermic.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q261 Mark1 markEasy
Define or state: Chemical Reactions and Equations.
Answer
Precipitation reactions.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q271 Mark1 markEasy
Define or state: Balanced equation.
Answer
A balanced chemical equation has the same number of atoms of each element on both sides.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q281 Mark1 markEasy
Define or state: Combination reaction.
Answer
In a combination reaction two or more substances join to form a single product.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q291 Mark1 markEasy
Define or state: Decomposition.
Answer
A decomposition reaction splits one compound into two or more products, often with heat, light or electricity.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q301 Mark1 markModerate
Define or state: Displacement.
Answer
A more reactive metal can displace a less reactive metal from its salt solution.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q312 Mark2 marksModerate
Give two points to explain Redox as used in Chemical Reactions and Equations.
Answer
1. Oxidation and reduction occur together in a redox reaction.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q322 Mark2 marksDifficult
Give two points to explain Exothermic as used in Chemical Reactions and Equations.
Answer
1. An exothermic reaction releases heat to the surroundings.
2. Respiration and many combustions
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q332 Mark2 marksModerate
Give two points to explain Endothermic as used in Chemical Reactions and Equations.
Answer
1. An endothermic reaction absorbs heat from the surroundings.
2. Photosynthesis
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q342 Mark2 marksModerate
Give two points to explain Precipitation as used in Chemical Reactions and Equations.
Answer
1. A precipitate is an insoluble solid formed in a double-displacement reaction.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q352 Mark2 marksModerate
Give two points to explain Chemical Reactions and Equations as used in Chemical Reactions and Equations.
Answer
1. A chemical equation must be balanced for mass.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q362 Mark2 marksDifficult
Give two points to explain Chemical Reactions and Equations as used in Chemical Reactions and Equations.
Answer
1. Combination, decomposition, displacement, double displacement.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q372 Mark2 marksModerate
Give two points to explain Redox as used in Chemical Reactions and Equations.
Answer
1. Redox: oxidation is gain of oxygen or loss of electrons as taught.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q382 Mark2 marksModerate
Give two points to explain Chemical Reactions and Equations as used in Chemical Reactions and Equations.
Answer
1. Exothermic vs endothermic.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q392 Mark2 marksModerate
Give two points to explain Chemical Reactions and Equations as used in Chemical Reactions and Equations.
Answer
1. Precipitation reactions.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q402 Mark2 marksDifficult
Give two points to explain Balanced equation as used in Chemical Reactions and Equations.
Answer
1. A balanced chemical equation has the same number of atoms of each element on both sides.
2. 2H2 + O2 → 2H2O
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 10 · Subject: Science · Chapter: Chemical Reactions and Equations · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
FAQs
Are these official CBSE board questions?
No. They are original practice questions aligned to NCERT topics used in CBSE classrooms. Official sample papers are published on cbseacademic.nic.in.
Will these questions appear in the board exam?
Nobody can promise a question. Use them for revision of frequently tested concepts and exam-style practice.
Is the chapter list the latest NCERT list?
Yes, the catalog follows current NCERT textbooks used in CBSE schools (including new middle-stage books such as Ganita Prakash and Curiosity). Always match the book issued by your school.
How should I use the 100 questions?
Try the question first, then tap Show answer. Mix MCQs with long answers. Revise formulas and diagrams from the textbook alongside this set.
Where are NCERT solutions?
Open the NCERT-style practice link on this subject or chapter. For word-for-word textbook exercise answers, use the NCERT book itself; we do not copy solution keys from other websites.
What is the suggested URL pattern?
Hub /cbse/, then /cbse/class-10/, then subject and chapter slugs.
Why is this a separate URL?
So students searching for “Revision Questions” land on a filtered set, while the chapter page remains the full 100-question bank. Same facts, different search intent.
Today's 3-step path
Follow this loop every day: mixed test, current affairs, then today's subject. A new set arrives tomorrow.
