Xam Idea Class 10 Science Chapter 2 Solutions: Acids, Bases And Salts

Xam Idea Class Science Solutions for 10 Chapter Chapter 2 ‘Acids, Bases and Salts’ is the best study resource for you. All these solutions are based on the latest exam pattern proposed by CBSE. They will surely help you in a speedy and swift preparation for Class 10 board exams. We have created exercise-wise solutions for Xam Idea in a systematic way for your easy understanding. The chapter covers concepts like acid, bases and their use in daily life, the reaction of different acids and bases with metals and non-metals, many salts, their formation and their uses in daily life.

The Xam Idea Solutions for Class 10 Science include 57 questions. The exercise section is divided into 6 parts where you will find a mixture of questions such as very short answer type questions, long answer type questions, value-based, high order thinking questions etc. In this chapter, three important concepts are given namely acids, bases and salts. The whole chapter revolves around these terms. You will be solving reasoning-based questions on compounds and chemical equations in this chapter.

Instasolv acts as a perfect aid in your exam days because it provides all the crucial questions and answers for Xam Idea chapters in an organised form. All our Xam Idea Class 10 Science solutions are designed in error-free and simple language so that you can revise the whole chapter in minutes. Our easy explanations will certainly reduce your burden and tension of the exams. Our solutions are based on CBSE and NCERT syllabus. Every answer is provided in a stepwise manner for your convenience.

Important Topics Of Xam Idea Solutions Class 10 Chapter 2: Acids, Bases And Salts

The chapter elaborates with the proper and accurate definition of acids, bases and salts. It also covers the topics such as how acids, bases and salts are important in daily use, why we need them, and which kind of acid, base or salt present in our body.

The chapter moves ahead with the properties of acids and bases, different types of indicators, reaction of acids and bases with metals/non-metals/ hydrogen carbonates.

In addition, it also includes how acid and bases react with each other, the reaction of metallic oxides with acids and reaction of non- metallic oxides with bases.

Further, we have similarities between acids and bases, acid or base in water solution, the strength of acid and base solution. The chapter does not end here we also have a family of salts where we study various types of salts such as baking soda, sodium hydroxide etc.

Introduction And Properties Of Acids/Bases

  • Acids are sour in taste and change the colour of blue litmus to red for example, HCL, H2SO4 whereas bases are bitter in taste and change the colour of red litmus to blue, for example, NaOH, KOH.
  • Litmus solution is a purple dye extracted from lichen and helps in testing the presence of acid and base. All the substances which help in testing the presence of an acid or base are called indicators, Example- turmeric, cabbage leaves, petunia etc.
  • All the acids give H+ ions in aqueous solution.
  • There are different types of acids such as strong acids, weak acids, diluted acids, concentrated acids etc.
  • All the bases are soapy to touch and gives OH ions in aqueous solution
  • All the water-soluble bases are called alkalis.
  • Other classification of bases includes a strong base, weak base.

Reaction Of Acids And Bases With Metals/ Non-Metals/ Hydrogen Carbonates

Reaction Of Acids With metals

The acid reacts with metals to form metal salt and releases hydrogen gas. Example – Zinc granules react with dilute hydrochloric acid and forms zinc chloride with the evolution of hydrogen gas.

2HCl + Zn = ZnCl2 + H2

Reaction Of Bases With Metals

Bases react with metals to evolve hydrogen gas and all the metals do not react with bases. Example Zinc granules react with sodium hydroxide to form sodium Zincate and evolve hydrogen gas.

2NaOH + Zn = Na2ZnO2 + H2

The reaction of Acids With Metal Carbonates and Hydrogen Carbonates

Acids react with metal carbonates and hydrogen carbonates to form a salt, carbon dioxide and water. CO2 can be tested by passing it through lime water as it turns lime water milky.

2HCl + NaHCO3 = NaCl + CO2 + H2O

Bases do not react with carbonates and hydrogen carbonates.

Neutralization Reaction

When acid and base react with each other to form salt and water, this kind of reaction is called a neutralization reaction. For example,

HCl + NaOH = NaCl + H2O

The reaction of Metallic Oxides With Acids

Metallic oxides are basic in nature and when they react with acids they form salt and water. For example,  CaO + 2HCl = CaCl2 + H2O

Reaction Of Non – metallic Oxides With Bases

Non-metallic oxides are acidic in nature and when they react with bases they form salt and water. For example,

CO2 + Ca(OH2) = CaCO3 + H2O

Strength Of Acid and Base

All the acids are classified as per their acid or basic content with the help of universal indicators. It is also called the ph level of solution. In the scale of ph, we rank acid and bases as per the hydrogen ion concentration.

For neutral Solution : ph = 7

For acidic solutions : ph <7

For basic solution : ph > 7

Ph is also used in our daily life like we have a fixed value of ph for our stomach or for tooth decay.


Salt is an ionic compound which is formed in a neutralization reaction. In this chapter, we mainly study 5 salts which are:

  • Sodium Hydroxide (when electricity is passed through NaCl it decomposes to form Sodium hydroxide. It is used in degreasing metals, soaps, paper making),
  • Bleaching Powder (it is produced by the action of chlorine on dry slaked lime and uses in bleaching industries),
  • Baking Soda ( it is formed when CO2 passes through aqueous sodium chloride and used for making crispy and crunchy food items),
  • Washing Soda (it is formed by recrystallization of sodium carbonate and uses in glass, soap, paper industries),
  • Plaster of Paris (it is formed on heating the gypsum and uses for supporting the fractured bones)

Exercise Discussion Of Xam Idea Class 10 Science Solutions Chapter 2: Acids, Bases And Salts

Very Short Answer Type Questions

There are a total of 18 questions in this section where you have to answer in limited words because each question carries only 1 mark. In this section, you have questions like how can we test whether the solution is acidic or basic in nature with the help of clues given in the statement, how acids and bases react with each other etc.

Short Answer Type Questions

The section contains 28 questions in all and each question carries 3 marks. All the questions are important from the exam point of view. In this section, you will face questions on salts and their formation. The other questions include properties of acids and bases and you have to tell which type of reaction is there in the question. It also includes questions which are based on the strength of acids and their ph values.

Long Answer Type Questions

This section includes 4 questions which are for 5 marks. How metal carbonates react with acids, what happens when zinc dust is used in place of zinc granules, what are different families of salts are some of the examples of questions that are discussed in this section.


This section includes 5 Questions where you have to think practically like they can have a question that why acetic acid is a weak acid though there are 4 hydrogen atoms in the molecule, why plaster of Paris is stored in moisture-proof containers etc.

Value-Based Questions

This section contains only 2 questions. The questions are based on the acids or bases that we use in daily life and you also have to tell which values they have learned from the question. The Xam Idea book for Class 10 Science also includes NCERT in-text questions as well as NCERT back exercise questions.

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