NCERT Solutions for class 10 Science chapter 1:  Chemical Reactions and Equations

NCERT Solutions for class 10 Science chapter 1 Chemical Reactions and Equations  are provided in this article. Some of the important topics in Chemical reactions and equations chapter include:

  1. Balanced Chemical Equations
  2. Decomposition Reactions
  3. Displacement Reactions
  4. Oxidation and Reduction
  5. Corrosion
  6. Rancidity

Expected no of questions: 2 to 3 questions of total 5 marks

Download PDF: NCERT Solutions for Class 10 Science Chapter 1 pdf


NCERT Solutions for Class 10 Science Chapter 1

NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations is given below.

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NCERT Solutions for Class 10 Science

 A chemical reaction is in which the bonds are broken within reactant molecules, and new bonds are formed within product molecules in order to form a new substance. A chemical equation is nothing but a mathematical statement which symbolizes the product formation from reactants.

Types of Chemical Reaction are as follows.

Decomposition Reaction: A decomposition reaction is a reaction that takes place when one reactant breaks down into two or more simpler substances.

Displacement Reaction: A displacement reaction occurs where an atom or a group of atoms is replaced by another atom. 

Oxidation Reaction: Oxidation is defined as the loss of electrons or an increase in the oxidation state of an ion, atom, or certain atoms in a molecule. It is also described as a reaction where an element combines with oxygen.

Reduction Reaction: Reduction is defined as the gain of electrons or a decrease in the oxidation state of an ion, atom, or certain atoms in a molecule. 

Corrosion is the process by where when metals react with moisture, saltwater, acid or any other substance for a long period of time, oxidation reaction occurs and metals loses their strength and get corroded. A layer of oxide of the metal forms on the surface of the metal. This layer is called as rust.

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CBSE X Related Questions

  • 1.
    What is the function of diaphragm in human respiratory system ? Where is it present in human body ?


      • 2.
        How does the change in curvature of the eye lens help us in the process of seeing the nearby objects clearly?


          • 3.

            The reasons for excessive generation of wastes are:
             (i) Use and throw policy. 
            (ii) Increased availability of packaged food. 
            (iii) Increased construction wastes. 
            (iv) Non-sorting of dry and wet wastes

              • (i), (iii) and (iv)
              • (i), (ii) and (iii)
              • (i), (ii), (iii) and (iv)
              • (ii), (iii) and (iv)

            • 4.
              Draw a neat diagram to show germination of pollen on the female reproductive part of the flower. Name and label only the following parts:
              (a) The part that receives the pollen grain.
              (b) The structure that carries the male germ cell to reach the female germ cell.


                • 5.
                  When a human egg is fertilized by a sperm having ‘Y’ chromosome, the zygote has the following combination of chromosomes:

                    • 44 + XX
                    • 22 + XX
                    • 44 + XY
                    • 22 + XY

                  • 6.
                    Assertion (A): Reflex actions do not involve thinking.
                    Reason (R): Most reflex actions are controlled by the spinal cord.

                      • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
                      • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
                      • Assertion (A) is true, but Reason (R) is false.
                      • Assertion (A) is false, but Reason (R) is true.

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