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NCERT Solutions for Class 10th Science: Ch 2 Acids, Bases and Salts

Chapter 1 - Chemical Reactions and Equations. Chapter 2 - Acids, Bases and Salts. Chapter 3 - Metals and Non-metals. Chapter 4 - Carbon and Its Compounds. Chapter 5 - Periodic Classification of Elements.

Chapter 6 - Life Processes. Chapter 7 - Control and Coordination. Chapter 8 - How do Organisms Reproduce? Chapter 9 - Heredity and Evolution.

Chapter 10 - Light Reflection and Refraction. Chapter 11 - Human Eye and Colourful World. Chapter 12 - Electricity. Chapter 13 - Magnetic Effects of Electric Current. Chapter 14 - Sources of Energy. Chapter 15 - Our Environment.

Chapter 16 - Management of Natural Resources. Having legitimate information on the hypotheses, the adequate practice of the reactions, conditions, and equations, and question-solving ability from the NCERT Chemistry books are very significant for prospects and increase the possibility of bagging a good score. This helps students to gain a better understanding of ncert solutions class 10th english chapter 2 sci chapter's concepts through these easy and comprehensive solutions.

Class 10th science chapter 2 is part of unit 1, Chemical Substances - Nature and Behaviours. This chapter portrays acid and base reactions and depicts how acid and base generally cancel out each. Acid, base and salt class 10 includes topics such as How do Acids and Bases react with each other or ncert solutions class 10th english chapter 2 sci, Reaction of acid with Hydrogen carbonates and Metallic oxides, Reaction of bases with oxides.

In addition to this, the Class 10th Science Chapter 2 includes various interactive activities and interesting topics such as similarities between acid and base and acid or base in a water solution to make the learning process straightforward and easy to understand.

This chapter will also help students learn about salts, their nature, pH, the chemicals that are derived from salt, and the nature and characteristics of salt crystals. All the aforementioned information is thoroughly explained through step by step process in the Ch 2 Science Class 10 Solutions that are designed by India's expert Science teachers to help you in understanding the meaning of basic concepts of acids, bases, and salts class 10 towards performing well in examinations as well as their relation to interesting things that we observe in our daily life.

The Acid, base and salt class 10 is one of the most important chapters as it provides you maximum chances to score high marks in your exams. The unit consisting of the chapter comes for a weightage of 33 marks and the chapter itself for 5 marks in the examination.

Through the Class 10 Science Chapter 2 solutions, you will be able to solve questions based on this chapter easily and strengthen the basic concepts of the subject chemistry. Following are the main headings that are covered under Chapter 2 Science Class 10 acids bases and salts:.

Understanding the properties of bases and acids. How do acids and bases respond with metals? How metal carbonates and metal hydrogen carbonates respond with acids? How do acids and bases respond with one another? The response of metallic oxides with acids. The response of non � metallic oxide with base. What do all acids and bases share for all intents and purposes?

Significance of pH in regular day to day existence. More about Salts. Group of salts. Synthetic substances from regular salt.

NCERT solutions for class 10 science chapter 2 acids bases and salts help students to have a decent comprehension of the concepts of this ncert solutions class 10th english chapter 2 sci. The fundamental advantages of these solutions are:. The solutions are not at all muddled and clarify bit by bit ncert solutions class 10th english chapter 2 sci to assist you with having a solid comprehension of the important concepts of this chapter.

Acid bases and salts class 10 solutions are given by teachers who are pros in this field and have an astounding experience. The arrangements made by them are precise and will help you in ensuring that you secure great marks in the tests. These solutions are planned and made remembering one ncert solutions class 10th english chapter 2 sci the principal targets towards helping you in acquiring excellent grades.

The answers to different questions in this section are explained with graphs and practical diagrams concerning a simple comprehension of students.

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Space Travel D. Heroes of the Environment C. A Tale of Three Villages E. Land of All Seasons B. Question 8 Why do acids not show acidic behaviour in the absence of water? The acid produces hydrogen ions only in the presence of water. So in the absence of water, an acid will not form hydrogen ions and hence will not show its acidic behaviour.

Which solution is a Neutral b Strongly alkaline c Strongly acidic d Weakly acidic e Weakly alkaline Arrange the pH in increasing order of hydrogen ion concentration. Question 10 Equal lengths of magnesium ribbons are taken in test tubes A and B.

In which test tube will the fizzing occur more vigorously and why? Answer: Fizzing will occur more vigorously in test tube A. Being strong acid, the hydrochloric acid solution contains a much greater amount of hydrogen ions in it due to which the fizzing will occur more vigorously in test tube A containing hydrochloric acid. The fizzing is due to the evolution of hydrogen gas which is formed by the action of acid on the magnesium metal of magnesium ribbon.

Question 11 fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer. Answer: pH of milk falls below 6 as it turns into curd due to the formation of lactic acid during this process. Lactic acid present in it reduces its pH value.

Question 12 A milkman adds a very small amount of baking soda to fresh milk. Answer: a Milk is made slightly alkaline so that it may not get sour easily due to the formation of lactic acid in it. Question 13 Plaster of Paris should be stored in a moisture proof container.

Explain why? Answer: Plaster of Paris should be stored in a moisture proof container because the presence of moisture can cause slow setting of plaster of Paris by bringing about its hydration. This will make the plaster of Paris useless after sometime. Question 14 What is a neutralisation reaction?

Give two examples. Answer: The reaction between an acid and a base to form salt and water is called a neutralisation reaction. Question 15 Give two important uses of washing soda and baking soda. Answer: Uses of washing soda : i Washing soda is used in glass, soap and paper industries.

Uses of baking soda : i Baking soda is used as an antacid in medicines to remove acidity of the stomach. One of them contains distilled water and the other two contain an acidic solution and a basic solution respectively. Solution: The contents of each test tube would be identified by change in colour of red litmus paper. For example, when we wet the red litmus paper with the basic solution, it changes into blue colour.

Put the changed blue litmus paper in the solution which turns the blue to red will be the acidic solution. The solution, which has no effect on any litmus paper, will be neutral and hence it will be distilled water.

Question 2 Why should curd and sour substances not be kept in brass and copper vessels? Solution: Curd and other sour foodstuffs contain acids, which can react with the metal of the vessel to form poisonous metal compounds which can cause food poisoning and damage our health. Question 3 Which gas is usually liberated when an acid reacts with a metal? Solution: When an acid reacts with metal, a salt and hydrogen gas is formed.

Question 4 Metal compound A reacts with dilute hydrochloric acid to produce effervescence. Solution: The gas that extinguishes a burning candle is carbon dioxide, which is formed by the action of dilute hydrochloric acid on a metal carbonate and produces effervescence. Now, since one of the compounds formed is calcium chloride, it shows that the metal compound is calcium carbonate.

Thus, the metal compound Ncert Solutions For Class 10th Science Chapter 12 Full A is calcium carbonate CaCO 3. Calcium carbonate reacts with dilute hydrochloric acid to form calcium chloride, carbon dioxide and water. This can be written as:. The compounds such as glucose and alcohol also contain hydrogen but they do not show acidic character. Question 6 Why does an aqueous solution of acid conduct electricity? Solution: The aqueous solution of an acid conducts electricity due to the presence of charged particles called ions in it.

Question 7 Why does dry HCl gas not change the colour of the dry litmus paper? Solution: Dry HCl gas does not contain any hydrogen ions in it, so it does not show acidic behaviour. Question 8 While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid? Solution: Diluting an acid should be done by adding concentrated acid to water gradually with stirring and not by adding water to concentrated acid.

The heat is evolved gradually when a concentrated acid is added to water for diluting an acid and the large amount of water is easily absorbed. If, however, water is added to concentrated acid to dilute it, a large amount of heat is evolved at once. The heat generated may cause the mixture to splash the acid on our face or clothes and cause acid burns.

Question 10 How is the concentration of hydroxide ions OH- affected when excess base is dissolved in water? Solution: When the solution of a base is diluted by mixing more water in it, the concentration of hydroxide ions OH � ions per unit volume decreases. Question 11 You have two solutions A and B. Solution: The pH of a solution is inversely proportional to its hydrogen ion concentration.

This means that the solution having lower pH will have more hydrogen ion concentration. In this case, solution A having a lower pH of 6 will have more hydrogen ion concentration. Solution A is acidic and solution B is basic.

Solution: Acids produce hydrogen ions in water. So, when an acid is added to water, the concentration of hydrogen ions in water increases. The solution of acid thus formed will have more of hydrogen ions and it will be acidic in nature. If yes, why are these basic? Question 14 Under what soil condition do you think a farmer would treat the soil of his fields with quick lime calcium oxide or slaked lime calcium hydroxide or chalk calcium carbonate?

Solution: Most often the soil in the fields is too acidic. If the soil is too acidic having low pH , it is treated with materials like quicklime calcium oxide or slaked lime calcium hydroxide or chalk calcium carbonate. Thus, a farmer should add lime or slaked lime in his fields when the soil is too acidic.

Question 15 What is the common name of the compound CaOCl 2? Solution: The common name of the compound CaOCl 2 is bleaching powder. Question 16 Name the substance that on treatment with chlorine yields bleaching powder. Solution: Calcium hydroxide is the substance that on treatment with chlorine yields bleaching powder.

Question 17 Name the sodium compound, which is used, for softening hard water. Solution: Sodium carbonate washing soda is used for softening hard water. Question 18 What will happen if a solution of sodium hydro carbonate is heated? Give the equation of the reaction involved. Sodium carbonate and carbon dioxide are evolved when sodium hydro carbonate is heated.

Question 19 Write an equation to show the reaction between plaster of Paris and water. Solution: Plaster of Paris has a very remarkable property of setting into a hard mass on wetting with water. So, when water is added to plaster of Paris, it sets into a hard mass in about half an hour.

The setting of plaster of Paris is due to the hydration crystals of gypsum, which set to form a hard, solid mass. Question 20 Why does distilled water not conduct electricity, whereas rainwater does? Solution: Distilled water does not conduct electricity because it does not contain any ionic compound like acids, bases or salts dissolved in it.

On the other hand, rain water conducts electricity. This can be explained as follows: Rain water, while falling to the earth through the atmosphere, dissolves an acidic gas carbon dioxide from the air and forms carbonic acid H 2 CO 3. So, due to the presence of carbonic acid which provides ions to rain water , the rain water conducts electricity. Question 21 Why do acids not show acidic behaviour in the absence of water?

Solution: The acidic behaviour of acid is due to the presence of hydrogen ions. The acids will not show its acidic behaviour in the absence of water, this is because the acids produce hydrogen ions only in the presence of water. Which solution is? Arrange the pH in increasing order of hydrogen-ion concentration. Question 23 Equal lengths of magnesium ribbons are taken in test tubes A and B.

In which test-tube will fizzing occur more vigorously and why? Fizzing occurs in the test tube due to the evolution of hydrogen gas by the action of acid on magnesium ribbon. Since hydrochloric acid is a strong acid a large amount of hydrogen gas is liberated in the test tube A. So fizzing occurs more vigorously in test tube A. Question 24 Fresh milk has a pH of 6. Solution: The pH will change to below 6, as lactic acid is formed when milk turns into curd.

Question 25 Plaster of Paris should be stored in a moisture-proof container. Solution: The presence of moisture can affect the slow setting of plaster of Paris by bringing about its hydration. This will make the plaster of Paris useless after some time. Question 26 What is a neutralization reaction? Solution: The reaction of an acid and a base, giving rise to the corresponding salt and water is called neutralization reaction. Question 27 Give two important uses of washing soda and baking soda.

Solution: Washing soda 1. It is often used as an electrolyte. Domestically it is used as a water softener during laundry. Baking soda 1. It is used to test garden soil for acidity. If it develops bubbles, the soil is too acidic. Washing Class 10th Science Chapter 2 Ncert Solutions English a car with it can remove dead bug bodies without damaging the paint. Question 1. Equal pieces of zinc granules are dropped in four test tubes.

Following substances are poured in all the four test tubes. Question 2. Which of the following statements shows the property of an acid? Thus, it has no effect on red litmus and acids are sour in taste. Question 3. A drop of a liquid sample was put on the pH paper.

It was observed that the colour of the pH paper turned blue. The liquid sample is [CCE ] a lemon juice b sodium bicarbonate solution c distilled water d hydrochloric acid Answer: b The liquid sample is of sodium bicarbonate NaHC 3 solution.

It is a basic solution. And we know that a basic solution turns pH paper blue. Question 4. Two solutions X and Y were found to have pH value of 4 and 10 respectively.

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