Chemical Reactions and Equations MCQs – NCERT Science Class X Ch.1 | Academia Aeternum
NCERT · Science · Ch.1

Chemical Reactions and Equations
MCQ MASTER SERIES

Reactants · Products · Balancing · Oxidation · Reduction

⚡ Start Quiz 📊 Analytics
50
Total Questions
30 min
Suggested Time
3
Difficulty Tiers
6
Core Topics
Question Intelligence

Quiz Analytics

A data-driven breakdown of all 50 questions by difficulty, exam origin and topic distribution.

📈 Distribution Overview

50
Total Questions
CBSE Board
28
State Board
14
Olympiad Level
8

🗂 Topic Coverage

Types of Reactions
24%
Balancing Equations
20%
Combination & Decomp.
18%
Displacement Reactions
16%
Oxidation & Reduction
14%
Corrosion & Rancidity
8%
28
CBSE Board
14
State Board
8
Olympiad Level
Conceptual Framework

Key Concept Highlights

6 foundational pillars that power every question in this quiz. Understand these, and the answers follow naturally.

⚗️
Chemical Equation
Reactants on left, products on right separated by →. A balanced equation obeys conservation of mass.
🔗
Combination Reaction
Two or more substances combine to form a single product: A + B → AB. Eg: CaO + H₂O → Ca(OH)₂.
💥
Decomposition
A single compound breaks into simpler substances. Thermal, electrolytic, or photochemical.
⚡
Displacement
A more reactive element displaces a less reactive one from its salt solution.
🔥
Oxidation & Reduction
Oxidation = loss of electrons / gain of oxygen. Reduction = gain of electrons / loss of oxygen. They always occur together (redox).
🌫️
Corrosion & Rancidity
Corrosion: surface oxidation of metals. Rancidity: oxidation of fats/oils causing bad taste and smell.
Pedagogical Value

Why MCQs Matter

Multiple-choice questions are not mere guessing games — they are the sharpest diagnostic tool available to a competitive exam aspirant.

🎯

Precision Recall

Vague understanding doesn't survive MCQs — they force exact conceptual clarity.

⚡

Exam Format Mirror

Direct simulation of CBSE Board objective sections and JEE Main Paper 1 structure.

📊

Exam Weight

~8%

of CBSE Class X Science Board marks

Quick Reference

Important Formula Capsules

6 must-memorise equations that surface repeatedly across CBSE and JEE papers.

Combination
\[ A + B \rightarrow AB \]
Decomposition
\[ AB \rightarrow A + B \]
Displacement
\[ A + BC \rightarrow AC + B \]
Double Disp.
\[ AB + CD \rightarrow AD + CB \]
Combustion
\[ C + O_2 \rightarrow CO_2 \quad (\Delta H < 0) \]
Photosynthesis
\[ 6CO_2 + 6H_2O \xrightarrow{h\nu} C_6H_{12}O_6 + 6O_2 \]
Learning Outcomes

What You Will Learn

By completing this quiz set you will have exercised all the following competencies.

01 Write and balance chemical equations using the hit-and-trial method
02 Classify reactions as combination, decomposition, displacement or double displacement
03 Identify oxidation and reduction in a given redox reaction
04 Explain corrosion of iron and methods to prevent it
05 Distinguish exothermic from endothermic reactions with examples
06 Describe the role of light in photodecomposition reactions
Exam Preparation

Strategy & Preparation Tips

5 evidence-based strategies to maximise your score in CBSE Boards and JEE.

Step 01
Memorise the Five Types
CBSE always asks to "identify the type". Know one example each for combination, decomposition, displacement, double displacement, and combustion.
Step 02
Balancing is Marks
Board exams award 1 mark per balanced equation. Practise balancing at least 15 equations from NCERT Exercises.
Step 03
OIL RIG for Redox
Oxidation Is Loss, Reduction Is Gain (of electrons). This mnemonic saves time in MCQs.
Step 04
Observation-Based Qs
CBSE asks "what do you observe when…" — memorise colour changes, gas evolution, and precipitate formation.
Step 05
Timed Practice
Attempt this 50-question set in 30 min. Chemical reactions MCQs are speed-friendly once types are memorised.

Ready to Test Your Mastery?

50 questions  ·  Elapsed timer  ·  Instant scored results

⚡ Begin Chemical Reactions and Equations Quiz
🎯 Knowledge Check

Chemistry — Chemical Reactions And Equations

50 Questions Class 10 MCQs
1
Which of the following indicates a chemical reaction?
2
Evolution of a gas is observed in:
3
Which of the following is a chemical change?
4
The correct representation of \(\mathrm{2H_2 + O_2 \rightarrow 2H_2O}\) is called:
5
Which of the following is a word equation?
6
A balanced chemical equation has:
7
Which of the following is true for \(\mathrm{2Mg + O_2 \rightarrow 2MgO}\)?
8
In the reaction \(\mathrm{Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2}\), zinc:
9
The physical states in chemical equations are represented by:
10
The reaction \(\mathrm{2H_2 + O_2 \rightarrow 2H_2O}\) is:
11
\(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2}\) is a:
12
\(\mathrm{2HgO \rightarrow 2Hg + O_2}\) is an example of:
13
\(\mathrm{Fe + CuSO4 \rightarrow FeSO_4 + Cu}\) is:
14
\(\mathrm{BaCl_2 + Na_2SO_4 \rightarrow BaSO_4 + 2NaCl}\) is:
15
\(\mathrm{2K + 2H_2O \rightarrow 2KOH + H_2}\) is:
16
Photosynthesis is an example of:
17
Combustion reactions are:
18
Decomposition of \(\mathrm{CaCO_3}\) on heating is:
19
The reaction \(\mathrm{HCl + NaOH \rightarrow NaCl + H_2O}\) is:
20
Burning of coal \(\mathrm{C + O_2 \rightarrow CO_2 }\)is:
21
In \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O, H_2 }\) is:
22
In the above reaction, \(\mathrm{CuO}\) is:
23
Oxidation involves:
24
Reduction involves:
25
Which is a reducing agent?
26
Which is an oxidizing agent?
27
Reaction \(\mathrm{Zn + CO \rightarrow ZnO + C}\) is:
28
Rusting of iron is:
29
In \(\mathrm{2Ag_2O \rightarrow 4Ag + O_2}\), silver is:
30
In the same reaction, oxygen is:
31
Rusting of iron can be prevented by:
32
Galvanization uses:
33
Rancidity of oils occurs due to:
34
Which is an endothermic process?
35
Neutralization produces:
36
Reaction of Na with Cl2 produces:
37
Reaction of HCl with Zn produces:
38
\(\mathrm{CO + O_2 \rightarrow CO_2}\) is:
39
Which of the following is a decomposition reaction?
40
\(\mathrm{CaCO_3 + 2HCl \rightarrow CaCl_2 + H_2O + CO_2}\) is:
41
Exothermic reactions:
42
Endothermic reactions:
43
Displacement reactions depend on:
44
\(\mathrm{2Al + Fe_2O_3 \rightarrow 2Fe + Al_2O_3}\) is:
45
Precipitation reaction occurs when:
46
\(\mathrm{K + H_2O \rightarrow KOH + H_2}\) is:
47
Oxidation number of oxygen in \(\mathrm{H_2O_2}\) is:
48
In \(\mathrm{2AgCl \rightarrow 2Ag + Cl_2}\) under sunlight, \(\mathrm{Cl^-}\):
49
A reaction that releases light and heat is called:
50
\(\mathrm{Na_2CO_3 + 2HCl \rightarrow 2NaCl + H_2O + CO_2}\) is:
📚
ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
Sharing this chapter
Chemical Reactions Class 10 MCQs – 50 Important Questions with Answers
Chemical Reactions Class 10 MCQs – 50 Important Questions with Answers — Complete Notes & Solutions · academia-aeternum.com
This set of 50 Multiple Choice Questions (MCQs) with answers and detailed explanations is designed for Class 10 Chemistry NCERT Chapter 1 – Chemical Reactions and Equations. It covers all key topics such as types of chemical reactions (combination, decomposition, displacement, double displacement), oxidation-reduction, corrosion, rancidity, and the writing/balancing of chemical equations. Each question is framed to test conceptual understanding, application skills, and exam readiness. These…
🎓 Class 10 📐 Science 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
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Exam tip: Sharing chapter notes with your study group creates a reinforcement loop. Teaching a concept is the fastest path to mastering it.

Frequently Asked Questions

A chemical reaction is a process in which one or more substances change to form new substances with new properties.

A chemical equation is a symbolic representation of a chemical reaction using formulas of reactants and products.

Equations are balanced to satisfy the Law of Conservation of Mass, ensuring equal atoms on both sides.

Reactants are starting substances, and products are the new substances formed in a chemical reaction.

A balanced equation has equal numbers of each type of atom on both sides of the reaction.

It shows the correct formulas of reactants and products but is not balanced.

Common symbols: (s) solid, (l) liquid, (g) gas, (aq) aqueous solution.

A combination reaction occurs when two or more reactants combine to form a single product.

The reaction of hydrogen and oxygen forming water (H2 + ½O2 ? H2O).

A reaction in which a single compound breaks down into two or more simpler substances.

Heating of calcium carbonate gives CaO and CO2 (CaCO3 ? CaO + CO2).

A single element replaces another element from its compound in a reaction.

Two compounds exchange ions to form two new compounds.

Precipitation is a type of double displacement reaction forming an insoluble solid.

Oxidation is the addition of oxygen or removal of hydrogen during a reaction.

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    ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
    Sharing this chapter
    Chemical Reactions Class 10 MCQs – 50 Important Questions with Answers
    Chemical Reactions Class 10 MCQs – 50 Important Questions with Answers — Complete Notes & Solutions · academia-aeternum.com
    This set of 50 Multiple Choice Questions (MCQs) with answers and detailed explanations is designed for Class 10 Chemistry NCERT Chapter 1 – Chemical Reactions and Equations. It covers all key topics such as types of chemical reactions (combination, decomposition, displacement, double displacement), oxidation-reduction, corrosion, rancidity, and the writing/balancing of chemical equations. Each question is framed to test conceptual understanding, application skills, and exam readiness. These…
    🎓 Class 10 📐 Science 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
    Share on
    WhatsApp
    Telegram
    X / Twitter
    Facebook
    Instagram
    Threads
    Pinterest
    LinkedIn
    Quora
    Discord
    Reddit
    Email
    academia-aeternum.com/class-10/science/chemical-reactions-and-equations/mcqs/ Copy link
    💡
    Exam tip: Sharing chapter notes with your study group creates a reinforcement loop. Teaching a concept is the fastest path to mastering it.

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