Chemical reactions and equations class 10 mcq online test

Table of Contents

About Class 10 Science Chapter 1 – Chemical reactions and equations

Chemical reactions and equations is the 1st chapter of class 10th science syllabus and its one of the easiest chapter of class 10th science syllabus. Chemical reactions, how to write chemical equations, how to perform combination and decomposition reactions, how to balance a chemical reaction and more are covered in the first chapter of NCERT Class 10 Science Chapter 1 Chemical Reactions and Equations. We learned the physical and chemical variations of matter in previous courses. A chemical reaction happens if a chemical transition occurs. The reactants, products, and their physical states are all symbolically represented in a full chemical reaction. You’ll also learn how to write a chemical equation, which is a description of a chemical reaction in symbols. The chapter also describes how to balance various chemical equations in various states.

Note – To Attempt test scroll down to this page

CLASS 10 SCIENCE CHAPTER 1 – CHEMICAL REACTIONS AND EQUATIONS DETAILED ANALYSIS
QUERIES	ANSWER TO QUERIES
DIFFICULTY LEVEL	Easiest chapter of class 10 science syllabus
EASIEST TOPIC	Types of chemical reactions
HARDEST TOPIC	Learning & writing chemical equations
WEIGHTAGE	8 marks as per latest sample paper of CBSE NOTE – It may vary between 5-8 marks
TYPE OF QUESTIONS ASKED	4 questions of 1 marks 1 assertion & reason question 1 question of 3 marks NOTE – This data is as per CBSE latest sample paper of 2023
NUMBER OF QUESTIONS IN EXAM	Approx 4-6 every year
IMPORTANCE OF CHAPTER	Will help in writing and understanding chemical reactions used in other chapters.
HANDWRITTEN NOTES OF THIS CHAPTER	Class 10 science handwritten notes pdf download
IMPORTANT TOPIC FOR EXAM	Decomposition Reaction and its types, Redox Reaction, Double decomposition reaction

How to revise for chemical reactions and equations mcq online test

Memorise class 10 science handwritten notes pdf of the chapter carefully.
Create Flowcharts to remember concepts in a concise manner for revision in less time.
In Chemistry, practice chemical reactions.
Thoroughly focus on the lines of NCERT textbook with a subjective approach in understanding fundamentals.
Practice chapter-wise Solved Examples and back exercises from NCERT texts.
Solve science sample papers class 10 with solutions in a timed manner.

Chemical reactions and equations Revision Notes

Chemical reactions – During
chemical reactions, chemical composition of substances changes or new
substances are formed. Chemical reactions
can be written in chemical
equation form which should be always balanced.

Types of Chemical Reactions

TYPES OF CHEMICAL REACTIONS
REACTIONS	EXAMPLES
Combination reaction – A single product is formed from two or more reactants.	2Mg +O₂→2MgO
Decomposition reaction – A single reactant breaks down to yield two or more products. Thermal decomposition Electrolysis Photo chemical reaction	2Pb(NO₃)₂ → 2PbO + 4NO₂ +O₂ 2H₂O →2H₂ +O₂ 2AgBr →2Ag +Br₂
Displacement reaction – One element is displaced by another element.	Zn + CuSO₄→ ZnSO₄ + Cu
Double displacement reaction – Exchange of ions between reactants.	AgNO₃ +NaCl →AgCl +NaNO₃
Redox reaction – Both oxidation and reduction take place simultaneously.	CuO + H₂ → Cu + H₂O
Exothermic reaction: A chemical reaction in which heat energy is evolved.	C + O₂ →CO₂ (g) + heat
Endothermic reaction: A chemical reaction in which heat energy is absorbed.	ZnCO₃ + Heat →ZnO + CO₂
Redox reaction: Chemical reaction in which both oxidation and reduction take place simultaneously. Oxidation: Reaction that involves the gain of oxygen or loss of hydrogen. Reduction: Reaction that shows the loss of oxygen or gain of hydrogen.	ZnO + C→Zn + CO ZnO is reduced to Zn – reduction C is oxidized to CO– oxidation

Effects of oxidation reactions in our daily life:

1. Corrosion : It is an undesirable change that occurs in metals,
when they are attacked by moisture, air, acids and bases.

Examples –

Corrosion (rusting) of iron: Fe₂O₃. xH₂O (Hydrated iron
oxide)
Corrosion of copper: CuCO3.Cu (OH) ₂
(Basic copper carbonate)
Corrosion of silver: Ag2S (Silver sulphide)
Corrosion of Aluminum: Al₂O₃ (Aluminum oxide)

2. Rancidity: Undesirable
change that takes place in oil containing food items due to the oxidation of
fatty acids.

Preventive methods

Adding antioxidants to the food materials.
Storing food in air tight container
Flushing out air with nitrogen gas.
Refrigeration

Chemical reactions and equations TEST

General Instructions

Your
test contains multiple choice questions with only one answer. There are total 30 questions.
This
is a 25 min test. Each question is of 50 second .
You need to select 1 options out of 4.
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Each question is of 20 points .
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Chemical reaction and equations Test

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