Chemical reactions and equations class 10 mcq online test

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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.

  1.  Thermal decomposition
  2. Electrolysis
  3. Photo chemical reaction
  1. 2Pb(NO3)2 → 2PbO + 4NO2 +O2
  2. 2H2O →2H2 +O2
  3. 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

  1. Your
    test contains multiple choice questions with only one answer. There are total 30 questions.
  2. This
    is a 25 min test. Each question is of 50 second .
  3. You need to select 1 options out of 4.
  4. you can’t leave the test in between once it is started.
  5. You can attempt the test unlimited time.
  6. Each question is of 20  points .
  7. No Negative Marking.
  8. You can view your Score after finishing the test.

Fill your Name in 1st box and Roll no. in 2nd box and Click on START THE QUIZ  

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Chemical reaction and equations Test

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7 thoughts on “Chemical reactions and equations class 10 mcq online test”

  2. Bhai there is some errors in the quiz.
    2-3 wrong answer is given check it carefully once again this is just a request 😇.
    According to this quiz i scored 26 there there is error plz solve this as soon as possible.
    Thanks

    Reply

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