Diy Canoe Building Plans Meaning

Important Questions for Class 10 Maths Chapter 6 Triangles - Learn CBSE

Going through the step-wise solutions for every question too is highly important to bag a good score. Also in this article, sciencs 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 cass 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: i 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? Ncetr 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 chaptee the metal of the vessel to form poisonous metal compounds which can ncert solutions for class 10th science chapter 2 eb food poisoning and affect our health adversely.

Question 2 Which gas is usually liberated when an acid reacts sloutions 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 ncert solutions for class 10th science chapter 2 eb 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, it 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 Ncert Solutions For Class 10th Science Chapter 1 Insta is calcium chloride.

Answer: As the end product is calcium chloride and the gas formed is carbon dioxide, the metal 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 ncert solutions for class 10th science chapter 2 eb 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 ncert solutions for class 10th science chapter 2 eb 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 foor, 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 chaptr 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 zcience hydroxide, but it happens to a limited extent only after which chaptee concentration becomes almost constant.

Question 1 You have two solutions A and B. The pH of solution A cuapter 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 10tj name of the compound CaOCl 2? Answer: Bleaching powder. Question ncerh Name the substance which on treatment with chlorine yields bleaching powder. Answer: Slaked lime Ca OH 2. Question chapher Name the sodium compound which is used be softening hard water. Answer: Sodium carbonate.

Question 4 What will happen if a solution chapteg sodium hydrogen carbonate is heated. Give the equation of the reaction involved? Answer: Solution of sodium hydrogen cuapter on heating gives sodium carbonate and carbon dioxide gas is chaptr. 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 solutiins gas that turns lime water milky.

Question 4 Which one ncert solutions for class 10th science chapter 2 eb the following types of medicines is used for treating indigestion? Question 6 Compounds such chzpter alcohol and glucose also contain hydrogen but are not categorised as acids.

Describe an activity scienxe prove it. The bulb does not glow in this case. This shows that alcohols and glucose are not acids. Question ncert solutions for class 10th science chapter 2 eb Why does distilled water not conduct electricity, whereas rainwater does?

Answer: Distilled water does not conduct chapterr because it does not contain any ionic compound like acids, bases or ev 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 ncery 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 csience Strongly alkaline c Sfience acidic d Weakly acidic e Weakly alkaline Arrange the pH in increasing order of hydrogen ion concentration. Question 10 Equal lengths ncert solutions for class 10th science chapter 2 eb magnesium chaapter 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 Ncert solutions for class 10th science chapter 2 eb 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 splutions 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 ncert solutions for class 10th science chapter 2 eb pH value. Question 12 A milkman adds a very small amount of baking soda sciebce 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 sciebce neutralisation reaction? Give two examples.

Answer: The reaction between an acid and a base to form salt and water is called a neutralisation reaction. Solutiojs 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 solutionss 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.

Check this:

As for sealing a bottom corner of a siding I cruise a dampness is wicking in between a cosmetic piece as well as an pavement paper adhered to a underside of a building sandwich. It is solidoverlapping about one-eighth of an in, constructed-up chaptef of a single of their products. "I could not suppose it.

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 Ncert Solutions For Class 10th Science Chapter 2 Quiz 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 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 Ncert Solutions For Class 10th Science Chapter 4 Youtube 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.

Acids, Bases and Salts chapter mainly explains the difference between acids, bases and salts. It also deals with various types of reactions related to these three forms of chemical compounds. 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 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 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 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:. To enhance the exam preparation of Class 10 Students, Vidyakul presents the most effective and unique supplementary material i.

Like NCERT Solutions Class 10 Maths which provided the students with a better approach towards complex topics, NCERT Solutions Class 10 Science also pledges to ease out the path of students preparing for the board exams and provide them with a much deeper understanding of the complex topics along with the illustrations wherever necessary.

These NCERT Solutions for Class 10 science aims at clearing all the doubts the student has while preparing for the board exams thus, boosting their preparation and helping them score maximum marks in the board exam. These Chapter-wise NCERT Solutions for Class 10 Science offer students' solutions to not only chapter-end exercises but also with solutions to in-text questions, thus covering each and every possibility to enhance the board exam preparation of Class 10 Students.

These Chapter-wise NCERT Solutions for Class 10 Science are created by a panel of experienced teachers with utmost precision to enhance the board exam preparation of the students in a well-structured manner which include a detailed step-by-step solution to the problem for all 15 chapters I. Moreover, some important or difficult questions are provided with multiple approaches to the answer to provide the students with an option to choose the best approach for them.

Related Links. By Login, you agree to our Terms and Privacy Policies. Forgot Password? OTP has been sent to you on your mobile number. Please enter below. Didn't receive OTP?

Skeeter Dual Console Bass Boat Use Build A Pontoon Boat Kit Kr