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


      • 2.
        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

        • 3.
          Sex is determined by different factors in various species. However, in human beings, it is determined genetically. Which amongst the following option(s) is/are correct for human beings ?
          Gamete carrying X chromosome from female parent.
          Gamete carrying X chromosome from male parent.
          Gamete carrying Y chromosome from male parent.

            • (ii) and (iii)
            • (i) only
            • (i) and (iii)
            • (iii) only

          • 4.

            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)

            • 5.
              Which of the plant hormones are responsible for the following processes? Promote cell division Inhibition of growth Detection of light Wilting of leaves


                • 6.
                  Which structure in a leaf is mainly responsible for gaseous exchange?

                    • Xylem
                    • Stomata
                    • Phloem
                    • Cuticle

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