Xam Idea Class 10 Science Chapter 1 Solutions: Chemical Reactions And Educations

Xam Idea Class 10 Science Solutions for Chapter 1 ‘Chemical Reactions and Equations’ is going to discuss a lot of topics with you that relate to your day to day life happenings. The topics discussed in this chapter are chemical equations, how to balance a chemical equation, types of chemical reactions, oxidation, reduction and rancidity.

Xam Idea Class 10 Science Solutions Chapter 1 consists of 20 questions. The questions are of different types like very short questions, short answer questions, long answer questions, value-based questions as well as Higher Order Thinking Skill type questions. These questions are mainly designed as per the basic to advance level like HOTS. It is essential to practice all the questions given in Xam Idea Class 10 Science Chapter 1 as then you will be able to make a strong base of the chapter. The strong base will eventually help you in scoring excellent marks in the exams.

The team of Instasolv has the professional experts who make dedicated efforts to render you the stepwise solutions to all the questions mentioned in Xam Idea Class 10 Chapter 1. The solutions will help you in studying from anywhere and at any time as Instasolv believes in making the study part easy for you. The answers given are very easy to understand and will help you in grasping new tricks and tips to effectively solve all the questions easily.

Important topics for Xam Idea Solutions Class 10 Science Chapter 1: Chemical Reactions and Equations

A chemical reaction occurs when a chemical change happens. This can be understood by the example:

You take a magnesium ribbon and rub it with sandpaper. Then holding it with a pair of tongs, you bring it close to a burner. You see that it burns with a dazzling white flame and changes into white coloured powder. This white coloured powder is magnesium oxide. Hence a chemical change has occurred therefore its a chemical reaction. Hence there are other examples of chemical reactions like when you react lead nitrate with potassium iodide, hydrogen gas is produced.

Therefore we come to the conclusion that when following changes occur, it’s a chemical reaction

1-Change in state

2-Change in colour

3-Evolution of a gas

4-Change in temperature

Chemical Equations

The simplest way to write a chemical equation is in the word form. As for the above magnesium ribbon reaction, we can write the equation as

Magnesium + OxygenMagnesium oxide

(Reactants)                    (Product)

The substances that undergo chemical change are the “REACTANTS”

The substance that is formed as the result of the reaction is the ”PRODUCT”

The reactants are written on the left-hand side with a (+) sign between them. The products are written on the right-hand side with a (+) sign between them. There is an arrowhead between them that points towards the products in the direction where the reaction is taking place.

Writing a Chemical Equation

A chemical equation can be written briefly if we write chemical formulas instead of words. For example:


Balancing a chemical equation

As we know about the law of mass that “mass can neither be destroyed nor be created” Therefore mass of the reactants should be equal to the mass of the products.

Take the following reaction and see if it’s balanced. If not then let’s learn to balance the following reaction:

Zinc+Sulphuric acid→Zinc Sulphate + Hydrogen

The above word equation may be represented by the following chemical equation:

Zn+H2SO4→ZnSO4 + H2

Let’s check the number of atoms on both sides:

Elements Number of atoms in reactants Number of atoms in products
Zn 1 1
H 2 2
S 1 1
O 4 4

As the number of atoms of elements is equal on both sides. Henceforth it is a balanced equation.

Now, let’s take one more example-:



Make a table

Elements Number of atoms in reactants No of atoms in products
Fe 1 3
H 2 2
O 1 4


Now to balance we take the compound that has a maximum number of atoms in it. It can be a reactant or a product. According to these criteria well take Fe3O4. Oxygen has the maximum number of atoms that is 4.

To balance the oxygen atom:

Atoms of oxygen

In reactants In products


1(in H2O)

4(in Fe3O4)

To balance 1×4


To balance the equation, you must remember that you cannot alter the chemical compound. You can only add a coefficient, just as 4 was multiplied

Fe+4(H2O) →Fe3O4+H2


Now to balance Fe and H .You can pick any one of them. Let’s start with H

Atoms of Hydrogen In reactants In products
Initial 8(in 4H2O) 2(in H2)
To balance 8 2×4



Now lets balance Fe

Atoms of Fe In reactants In products
Initial 1(in Fe) 3(in Fe3)
To balance 1×3 3



Finally, to check if the equation is balanced, we count the number of atoms on both sides.


Write symbols of their physical states. Their states are written like solid, aqueous, liquid or gaseous.


Sometimes the reaction conditions such as temperature, pressure, catalyst are also written. For example:


CO+H2(g) →CH3OH(l)

Other Topics Covered in the Chapter are:

  • Types of chemical reaction

1-Combination reaction

2-Decomposition Reaction

3-Displacement Reaction

4-Double displacement Reaction

You will study about these reactions in the chapter.

  • Oxidation and reduction
  • Rancidity

Exercise Discussion of Xam Idea Class 10 Science Solutions Chapter 1: Chemical Reactions and Equations

Very Short Answer Type Questions

This section will include 7 questions in total. It will include questions regarding chemical reactions. You may have to balance or write a chemical equation. Each question will be of one mark.

Short Answer Type Questions -1

This section will contain 4 questions. It will include questions like you have to tell whether it is a chemical change or a physical change. Each question will carry 2 marks.

Short Answer Type Questions 2

This section will contain 2 questions. Conditions will be given and you will have to write the chemical equation and you will also have to determine the type of reaction in each case. Each question will score you 3 marks.

Long Answer Type Questions

This section will contain 2 questions, each carrying 5 marks. There will be a chemical equation given and you will have to write which substance is getting oxidized and which substance is getting reduced. In addition to this, you will also have to tell the oxidising and reducing agent. Then there will be few gases given and you will have to tell the test for each one of them.

Higher Order Thinking Skills (HOTS)

In this section, in total 4 questions would be there. These will be some higher-order thinking skills questions. There will be some justification questions like prove something related to chemical equations. It will also contain questions like identify a compound in a certain chemical reaction. This will require more concentration because the questions could be a little tricky but answers will be easy. The main thing here will be of understanding the question.

Value-based Questions

This section contains a single question. The question is based on things used in our day to day lives. The last part of the question is answering what values you’ve learned. And each part will hold a different answer for it.

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