Ncert Solutions For Class 10th Science Chapter 2 Table
13.02.2021
NCERT Exemplar Class 10 Science Solutions Chapter 2 - Download PDF for Free
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution Ncert Solutions For Class 10th Science Chapter 2 Table and a basic solution, respectively. If ncert solutions for class 10th science chapter 2 table are given only red litmus paper, how will you identify the contents of each test tube? If the colour of red litmus does not change then it is acid. If the colour of red litmus changes to blue then it is base.
If there is slight change in the colour of red litmus such as purple then it is distilled water. Curd and other sour substances contain acids. Therefore, when they are kept in brass and copper vessels, the metal reacts with the acid to liberate hydrogen gas and harmful products, thereby spoiling the food.
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? Take few pieces of zinc granules and add 5 ml of dilute H2SO4. Shake it and pass the gas produced into a soap solution. The bubbles of the soap solution are formed. These soap bubbles contain hydrogen gas. Metal compound Ncert Solutions For Class 10th Science Chapter 2 Table A reacts with dilute hydrochloric acid to produce effervescence.
The gas evolved extinguishes a burning candle. Write a balanced chemical ncert solutions for class 10th science chapter 2 table for the reaction if one of the compounds formed is calcium chloride. For example just see the following reactions. When alcohols and glucose are mixed with water then they do not dissolve to form ions. Hence ncert solutions for class 10th science chapter 2 table do not show acidic character.
While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid? Since the process of dissolving Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table an acid in water is exothermic, it is always recommended that acid should be added to water.
If it is done the other way, then it is possible that because of the large amount of heat Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table generated, the mixture splashes out and causes burns. This means that the strength of the acid decreases. You have two solutions, A and B. The pH of solution A is 6 and pH of solution Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table B is 8. Which solution has more hydrogen ion concentration?
Which of this is acidic and which one is basic? A pH value of less than 7 indicates an acidic solution, while greater than 7 Ncert Solutions For Class 10th Science Chapter 2 Table indicates a basic solution.
However, their concentration is less as compared to the concentration of OH � ions that makes the solution basic. Under what soil condition do you think a farmer ncert solutions for class 10th science chapter 2 table treat the soil of his fields with quick lime calcium oxide or slaked lime calcium hydroxide or chalk calcium carbonate?
If the ncert solutions for class 10th science chapter 2 table is acidic and improper for cultivation, then to increase the basicity of soil, the farmer would treat the soil with quick lime or slaked lime or chalk. Name the substance which on treatment with Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table chlorine yields bleaching powder? Name the sodium compound which is used for softening hard water.
What will happen if a solution of sodium hydrocarbonate is heated? Give the equation of the reaction involved. When sodium hydrogen Ncert Solutions For Class 10th Science Chapter 2 Table carbonate is heated then sodium carbonate and water is formed along with the evolution of carbon dioxide gas. A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains a NaCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution the same solution as before required to neutralise it will be a 4 mL.
Which one of the following types of medicines is used for treating indigestion? Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it. Two nails are fitted on Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table a cork and are kept it in a mL beaker.
The nails are then connected to the two terminals of a 6-volt battery through a bulb and a switch. Some dilute HCl is poured in Ncert Solutions For Class 10th Science Chapter 2 Table the beaker and the current is switched on. The same experiment is then performed with glucose solution and alcohol solution.
Observations: It will be observed that the bulb glows in the HCl solution and does Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table not glow in the glucose solution. These ions conduct electricity in the solution resulting in the glowing of the bulb. On the other hand, the glucose solution does not dissociate into ions. Therefore, it does not conduct electricity.
Conclusion: Ncert solutions for class 10th science chapter 2 table this activity, it can be concluded that all acids contain hydrogen but not all compounds containing hydrogen are acids. That is why, though alcohols and glucose contain hydrogen, they are not categorised as acids. Why does distilled water not conduct electricity, whereas rain water does?
Distilled water cannot conduct electricity because it does not contain ions while rain water conducts electricity as it contains ions due presence of dissolved salts in it.
Acids do not show acidic behaviour in the absence of water because the dissociation of hydrogen ions from an acid occurs in Ncert Solutions For Class 10th Science Chapter 2 Table the presence of water. Which solution is a neutral? Arrange the pH in increasing order of hydrogen-ion concentration.
Equal lengths of magnesium ribbons are taken in test tubes A and B. In which test tube Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table will the fizzing occur more vigorously and why? The fizzing will occur strongly in test tube A, in which hydrochloric acid HCl is added. Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd?
Explain your answer. The pH of milk is 6. As it changes to curd, the pH will reduce because curd is acidic in nature. The acids Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table present in it decrease the pH. A milkman adds a very small amount of baking soda to fresh milk.
Therefore, it takes a longer time for the curd to set. The Plaster of Paris should be Ncert Solutions For Class 10th Science Chapter 2 Table ncert solutions for class 10th science chapter 2 table in a moisture-proof container as it absorbs water from moisture and turn into hard substance Gypsum as shown in following chemical equation.
A reaction in which an acid and base react with each other to give a salt and water is termed as neutralization reaction. Baking powder is a mixture of baking soda and a mild acid known as tartaric acid.
When it is heated or mixed in water, it releases CO2 that makes bread or cake fluffy. Your email address will not be published. This site uses Akismet to reduce spam. Learn how your comment data Ncert Solutions For Class 10th Science Chapter 2 Table is processed. Add a Comment Cancel reply Your email address will not be published.
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Some important topics involved in this chapter are:. Important topics covered in this chapter are:. Carbon and its Compounds chapter describes various features of carbon element and different compounds Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table formed by it. Give below are the main topics covered in class 10 Science Chapter Here students get to learn the carious concepts related to the classification of elements.
Some major concepts discussed in this chapter are:. Life Processes chapter deals with the various biological processes and reaction taking place in organisms. Some major topics covered in this chapter are:. Control and Coordination chapter gives details of different ways in which Class Chapter 10th For Table Solutions 2 Science Ncert Ncert Solutions For Class 10th Science Chapter 2 Table organisms respond to the stimuli. Here you also get to know about the human nervous system, automatics and voluntary actions, exocrine and endocrine glands, etc.
How do Organisms Reproduce chapter students get to learn different Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table methods of reproduction in plants and animals and get aware of the various methods of birth control in humans. Some of the important topics discussed in this chapter are:. Heredity And Evolution chapter deals with Ncert Solutions For Class 10th Science Chapter 2 Table the details related to heredity and evolution of different species. Go through the major topics mentioned below:. Light Reflection and Refraction explains the concepts of reflection and refraction of light.
Some important topics to learn from this chapter are:. The Human Eye and Colorful World chapter students get to know each and every detail of the human eye from its structure to its working.
Various defects of vision are also discussed Ncert Solutions For Class 10th Science Chapter 2 Table here. It also explains atmospheric refraction and various phenomena related to it. Some major topics discussed in this chapter are:. Electricity chapter explains electric current, its applications and various effects related to it.
Answer: The Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table 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 once.
Answer: When a given amount Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table and pH of solution Ncert Solutions For Class 10th Science Chapter 12 Student 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, Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 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 Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table 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 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 Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table 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 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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 Ncert Solutions For Class 10th Science Chapter 2 Table 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.
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