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NCERT Solutions for Class 10 Science Updated for NCERT Solutions for Class 10 Science Chapter 1 � Chemical reactions and equations is an outstanding study resource needed for the students studying in CBSE Class These NCERT Solutions are crafted as per the latest CBSE syllabus by subject experts at BYJU�S. The NCERT Solutions for Class 10 Science Chapter 6- Life Processes, solutions have been designed considering the concept-based approach which allows students to answer precisely which is the most important aspect that needs to be noted for the board exams. Chapter 6 Life Processes. CBSE Chapter Wise Important Questions for Class 10 Science Board Exam Pdf free download was designed by expert teachers from latest edition of NCERT books to get good marks in board exams. Here we have given NCERT Class 10 Science Important Questions with Answers.
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Answer: If the soil is too acidic having low pH then it is treated with materials like quick lime calcium oxide or slaked lime calcium hydroxide or chalk calcium carbonate. Question 1 What is the common name of the compound CaOCl 2? Answer: Bleaching powder. Question 2 Name the substance which on treatment with chlorine yields bleaching powder.

Answer: Slaked lime Ca OH 2. Question 3 Name the sodium compound which is used for softening hard water. Answer: Sodium carbonate. Question 4 What will happen if a solution of sodium hydrogen carbonate is heated. Give the equation of the reaction involved?

Answer: Solution of sodium hydrogen carbonate on heating gives sodium carbonate and carbon dioxide gas is evolved. Question 5 Write an equation to show the reaction between plaster of Paris and water. Question 1 A solution turns red litmus blue, its pH is likely to be a 1 b 4 c 5 d 10 Answer: d Question 2 A solution reacts with crushed-egg shells to give a gas that turns lime water milky. Question 4 Which one of the following types of medicines is used for treating indigestion?

Question 6 Compounds such as alcohol and glucose also contain hydrogen but are not categorised as acids. Describe an activity to prove it. The bulb does not glow Class 10th Ncert Science Chapter 1 Question Answer in this case also.

This shows that alcohols and glucose are not acids. Question 7 Why does distilled water not conduct electricity, whereas rainwater does? Answer: Distilled water does not conduct electricity because it does not contain any ionic compound like acids, bases or salts dissolved in it. Rainwater, 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.

Hence, due to the presence of carbonic acid which provides ions to rainwater, the rainwater conducts electricity. 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 Class 10th Ncert Question Answer 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 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.

A smartphone that a student uses to interact with his friends and distant family members is also a gift of science, and without science, it won't be possible. There are chapters of chemistry, biology, and physics in the class 10 textbook of Science. With the help of the solutions, students can get to know what questions are there on these chapters and how to tackle them in the board exams to score better marks and stay ahead in the class.

The 1st chapter of class 10 science is about chemical reactions and equations. Some questions are based on different chemical equations that students have to balance. These questions are high-scoring ones and students can easily use these questions to get better marks.

The chapter deals with different ways of forming chemical equations. Not to mention that students will also get to learn more about topics such as rancidity and corrosion. There is also information about metal reactivity and different chemical changes that take place. This chapter has a lot of questions about acids, salts, and bases and it is a really important chapter for sure.

We all know about the different chemical reactions. In this chapter, we are going to learn about the different reactions of the compounds with one another in the best way. There are also some details about the neutralization reaction in this chapter.

Also, the pH scale is mentioned in the best way for students to understand. These are some reactions that students will have to study:. Reaction of non-metallic oxides with a base. Reaction of metal carbonate or metal hydrogen carbonate with different acids. Neutralization Reaction.

This is a chapter that begins with an explanation of different physical properties regarding different metals and non-metals. Then the students will reach the chemical properties of these metals and non-metals as well.

After that, we get to learn more about different reactions that go through these products after they are being reacted with compounds. Apart from that, there are several details about corrosion and other topics such as metal occurrence in nature and the environment.

Most long-answer questions are included in the chapter along with some experiments as well. There are 5 different exercises along with an End exercise in this chapter. One of the most important topics that students have to go through in this chapter would be the basics of the detergent and soap cleansing actions. There is also a mention of the nomenclature of carbon and the different compounds that it has.

Also included are details about the derivatives of such compounds in the best way. There are 5 exercises and an End exercise in this chapter. Students will be able to learn the analysis, applications, of Carbon and its Compounds from these solutions of the chapter. There are also some memory-based and practical questions provided here.

How we managed to reach the periodic table is also included in the chapter. There are descriptions of the different details about the modern periodic table.

The chapter consists of different questions and exercises to which you will get solutions. Students can get well-explained and detailed answers to the questions in this particular chapter that they can further use in order to ensure that they are able to answer all the questions in the easiest way. The 6th chapter of Class 10 Science is of Biology and it deals with different processes of life such as Respiration, Transpiration, Nutrition, Excretion, and much more in plants and human beings.

The chapter consists of 34 different questions and from these questions, some are objective while others are long-answer type questions. Students can use these questions and get their solutions from our official site to make sure that they are able to score better marks than the others in their examinations. We are pretty sure that this is going to help a lot.

In this chapter, students will get to have a deeper understanding of topics such as the nervous system in the body of human beings. Also, they will get to know about the anatomy of the human brain along with the coordination of hormones in animals. The chapter includes about 12 different questions and there are some objective-type options for the students to choose from as well.

Go and refer to the NCERT solutions for class 10 science right now to get the best results in your exams. In the 8th chapter of the book, we provide some explanation about the process of reproduction that takes place in single-celled organisms and multi-celled organisms as well. The chapter explains the different types of reproduction such as sexual and asexual. Also, there are details about the reproductive systems in plants as well as animals.

There are about 11 questions in this chapter and there are some exercises as well. So, students will get to learn a lot from these chapters in the best way.

This chapter in the science book deals with the passing of genes between different generations. Also, the chapter provides information on the process of sex determination. The chapter has details on the entire concept of Evolution with the help of the Charles Darwin theory.

Students can get familiar with the concepts and then attempt to solve the questions that are provided in the chapter. There are about 12 questions in it along with end exercises as well. After reading this chapter, the students will get to know about the different phenomena that the light has to go through. Refraction and reflection are the important topics in this chapter and there are several explanations to these the laws of refraction and reflection.

There are also some mathematical elements in the chapter that are explained well in our solutions. The chapter includes 17 different questions along with an end exercise for the students. The first 5 questions included in the chapter tend to be objective. This is a chapter that will primarily focus on the human eye structure as well as the various functions that are included in every single part of the eye. Also, there are some explanations regarding the different eye problems that people might have in their life.

There are about 13 questions present in the chapter. Also, there are diagrams that students need to study so that they can score better marks in their exams. This chapter is really important as all the answers are based on the details provided in the chapter. For this chapter, students will dive into the different concepts of electric current. They will also get to learn important terms such as potential difference, resistance, circuit diagrams, and much more. Also, students will know about the different effects of heating on electrical power and current.

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