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.
    Identify the correct statement for spirogyra, leishmania and hydra

      • they reproduce sexually.
      • they are unicellular.
      • they are multicellular.
      • they reproduce asexually.

    • 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.
        Plants use variety of techniques to get rid of their waste materials. Some are mentioned below. Identify the incorrect one:

          • Excess water is given out by transpiration.
          • Gums and Resins are wastes that are stored.
          • Roots secrete some wastes into the soil.
          • Flowers can store some waste products.

        • 4.
          State two differences between the act of chewing food and salivation on sight of food.


            • 5.
              In human beings, the implantation of fertilised egg takes place in which part of female reproductive system?

                • Oviduct
                • Cervix
                • Uterus
                • Vagina

              • 6.
                The natural sources of oxalic acid, lactic acid and methanoic acid respectively are:

                  • tomato, curd, ant-sting
                  • tomato, orange, nettle-sting
                  • orange, milk, ant-sting
                  • orange, sour milk, nettle-sting

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