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NCERT Solutions for Class 10 Science Chapter 2 Acid Bases Salt CBSE

Going through the step-wise solutions for every question too is highly important to bag a good score. Also in this article, you will find the Step-wise explanation for each and every question. Going through them will help you in getting a better understanding of how to solve problems. Question 1 You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively.

If you are given only red litmus paper, how will you identify the contents of each test tube? Answer: ncert solutions for class 10th science chapter 2 time Put the red litmus paper in all the test tubes, turn by turn. The solution which turns red litmus to blue will be a basic solution.

The blue litmus paper formed here can now be used to test the acidic solution. The solution which turns the blue litmus paper to red will be the acidic solution. Question 1 Why should curd and sour substances not be kept in brass and copper vessels? Answer: Curd and sour substances should not be kept in brass and copper vessels because these and other sour food-stuffs contain acids which can react with the metal of the vessel to form poisonous metal compounds which can cause food poisoning and affect our health adversely.

Question 2 Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas? Answer: i Hydrogen H 2 gas is liberated when an acid reacts with a metal. Take some zinc granules in the test tube. Add about 5 mL dilute hydrochloric acid slowly. Soon the reaction between zinc and hydrochloric acid starts and hydrogen gas is evolved. When passed through soap solution, ncert solutions for class 10th science chapter 2 time gets trapped into bubbles.

Bring a burning candle near the soap bubble filled with gas. The soap bubble bursts and hydrogen gas burns with a pop sound.

Question 3 Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.

Answer: As the end product is calcium chloride and the gas formed is carbon dioxide, the ncert solutions for class 10th science chapter 2 time compound A must be calcium carbonate. Therefore, the reaction between calcium carbonate and hydrochloric acid is.

Question 1 Why do HCl, HNO 3etc show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character? HCl, HNO 3. Therefore, alcohol and glucose do not show acidic character. Question 2 Why does an aqueous solution of an acid conduct electricity? Answer: The aqueous solution of an acid conducts electricity due to the presence of charged particles called ions in it.

Question 3 Why does dry HCl gas not change the colour of the dry litmus paper? Question 4 While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid? Answer: While diluting an acid it is recommended that the acid should be added to water and not water to the acid because if water is added to concentrated acid to dilute it, then a large amount of heat is evolved at.

Answer: When a given amount of an acid is added to water, there is a fixed number of hydronium ions per volume of the solution. On dilution, the number of hydronium ions per volume decreases and concentration decreases.

Question 6 How is the concentration of hydroxide ions OH � affected when excess base is dissolved in a solution of sodium hydroxide? Answer: The concentration of hydroxide ions will increase when excess base is dissolved in a solution of sodium hydroxide, but it happens to a limited extent only after which the concentration becomes almost constant.

Question 1 You have two solutions A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic? Answer: A pH value of less than 7 indicates an acidic solution, while greater than 7 indicates a basic solution. Since solution A has more hydrogen ion concentration, solution A is acidic and solution B is basic.

If yes, then why are these basic? But these are far less in number than OH � ions that is responsible for their basic nature. Question 4 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?

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 ncert solutions for class 10th science chapter 2 time name of the compound CaOCl 2? Answer: Bleaching powder.

Question 2 Name the substance which on treatment with ncert solutions for class 10th science chapter 2 time 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 Ncert Solutions For Class 10th Science Chapter 1 Time 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 in this case. 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 ncert solutions for class 10th science chapter 2 time 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 ncert solutions for class 10th science chapter 2 time below 6 as it turns into curd due to the formation of ncert solutions for class 10th science chapter 2 time 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. 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 ncert solutions for class 10th science chapter 2 time 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.

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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, Ncert Solutions For Class 10th Science Chapter 7 Inst and much more.

Also, students will know about the different effects of heating on electrical power and current. Not to mention that students will get to understand the different symbols used in a circuit diagram. Also, there are some details about the current flow that occurs in a particular circuit and much more.

The 13th chapter of Class 10 science deals with important topics such as magnetic fields and different field lines. Also, students can learn about hard rules, the force on a particular type of current conductor, magnetic fields, and circuits. The chapter is meant to provide an insight into topics such as generators, motors, electromagnetic inductions, and much more.

There are 18 questions in the chapter along with a few objective types as well. In the exercises for this chapter, students will also find several numerical solutions. Students will know about different energy forms that are available to mankind such as non-conventional and conventional forms of energy. There are comparisons between different energy forms and the explanations are provided in the chapter. Also, students will get to know the importance of using several non-conventional types of energy rather than the conventional options.

There are 10 questions in this chapter and some of them are objective types. There are several ecosystems working in the environment and students will get to know about keeping it stable and balanced. There is also information about ozone layer depletion, food chains, and management of waste. The chapter has a total of 9 questions and 3 are objective ones. The chapter goes through important topics such as management and preservation of different resources that include petroleum, coal, wildlife, forests, and much more.

The chapter consists of 7 questions and students can find all the answers to these questions in our PDF files for the solutions. Unit Name. World of living. Natural Phenomena. Effects of Current. Natural Resources. Total Marks. Type of Questions. Objective Type. Short Answer Type. Long Answer Type. These solutions will help you prior to your exams as you can know more about the marking scheme, question pattern, difficulty level and nature of questions, section-wise marking and so much more.

Here are some benefits of referring to these solutions. By knowing the pattern of different questions that come in the examination, students can easily make sure that their preparation is on point. This way they are more confident and sure about taking the board exam and hence they get to score more marks. It cannot be denied that time management gets better and better with more practice as it helps in boosting the speed of answering the questions during your exams.

So, with total awareness of the answers with the solutions provided by us, you can efficiently manage time. One of the best things about the NCERT solutions that we have for class is that these answers are prepared by teachers and masters who have enough experience in teaching the subject.

Hence, the details and the accuracy of the chapters are undeniable for sure. While students might get anxious during their board exams, with the help of these NCERT solutions, they can easily practice more and more which will further reduce their stress and make sure that they are able to perform well in the exams.

The paper consists of questions with a total of 80 marks and includes different questions of varying length and marking. There are some practical questions too. The paper is divided into three sections A, B, and C.

The 1st section has one mark questions while the second section has a few short answer type questions that are of 3 marks and the third section will have long-answer questions which Ncert Solutions For Class 10th Science Chapter 2 Iso are mostly of 5 marks each. The NCERT Solutions for the Class 10 science questions will provide more understanding and knowledge to the students about the chapters.

With a clear concept, they will get to understand all the important topics and hence will be able to answer the questions asked in the exams in a better way. Not to mention that it also assists a lot when it comes to increasing the aggregate marks in board exams. It is not a surprise that science is considered to be one of the subjects where students can score the most. Hence, students need to make sure that they are able to have knowledge and details about all the chapters provided in the book of Class 10 Science.

All these solutions and answers are created very carefully under the expertise of masters and professors. With these answers, students will get to have all the details for their preparation for class 10 board exams. Students get to understand how they are going to solve the different questions present in the exams and also they will get to know about the marking scheme and the question difficulty level.

Objective Type 1 mark each. Short Answer Type 3 marks each. Long Answer Type 5 marks each. Our scientifically designed learning resources are geared to help you pack more punch into your study time. Install the Meritnation App Get a link to download the app on your phone.

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