Answer: An acid is a substance, which dissociates on dissolving in water to produce hydrogen ions [H+(aq) ions]. This can be written as: Question 5 The gas will burn with a pop sound confirming the presence of hydrogen gas. 2. Solution: NCERT Solutions For Class 10 Science Chapter 2 Acids And Bases: In this article, we will provide you with NCERT Solutions For Class 10 Science Chapter 2 Acids And Bases. Question 27 (a) Lemon juice Question 15 (d) III Acetic acid (CH3COOH) is a weak acid whereas hydrochloric acid (HCl) is a strong acid. A drop of a liquid sample was put on the pH paper. Question 9 A salt is dissolved in water. If you are given only red litmus paper, how will you identify the contents of each test tube? String Data Manipulation Long Answer Type Questions (8 Marks) Question 1. This will make the plaster of Paris useless after sometime. Lower pH of sour & sweet food can cause tooth decay. Ca(OH)2 + Cl2 → CaOCl2 + H2O Answer: Other options (a) and (b) contain acids and option (c) is a neutral salt. Give the equation of the reaction involved ? Solution: Ans: A coin and feather when dropped in vacuum falls simultaneously due to free fall as there is no external resistance in vacuum. Which of the following would change the colour of this pH paper to greenish blue? What do you know about string function? NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. (a) I The numerical value of gravitational constant (G) is 6.67*10-11 and its unit is Nm2/Kg2. (c) dilute sulphuric acid reacts with aluminium powder Soon the reaction between zinc and hydrochloric acid starts and hydrogen gas is evolved. The solution of acid thus formed will have more of hydrogen ions and it will be acidic in nature. Fizzing occurs in the test tube due to the evolution of hydrogen gas by the action of acid on magnesium ribbon. The acidic behaviour of acid is due to the presence of hydrogen ions. (c) Common salt A generator converts mechanical energy into electrical energy. (d) Lime water Question 1 Write about the different components of the computer. Since ancient times, it’s been proved several times that Science has the capacity to revolutionize the phases of Mankind. Question 14 Answer: (c) distilled water Solution: (a) lemon juice (b) Salts which are completely ionisable in water are said to be neutral salts and their pH is equal to 7. NCERT Exemplar Problems Class 10 Science Solutions in PDF format are available to download for new academic session 2020-2021 and Download NCERT books -2020-21 or download NCERT Solutions along with the answers of book. Question 12 Which is the most appropriate set up? Before getting into the details of NCERT Solutions For Class 10 Science Chapter 2 Acids And Bases, let’s have an overview of topics & subtopics under NCERT Solutions for Class 10 Science Chapter 2 Activities: Free download NCERT Solutions for Class 10 Science Chapter 2 Acids And Bases PDF in Hindi Medium as well as in English Medium for CBSE, Uttarakhand, Bihar, MP Board, Gujarat Board, and UP Board students, who are using NCERT Books based on updated CBSE Syllabus for the session 2019-20. Carbonic acid provides hydrogen ions, H+ (aq) and carbonate ions, CO(aq)32to rainwater. Which of this is acidic and which one is basic ? Question 5 2NaOH + CO2 → Na2CO3 + H2O, Salt is formed by combination of acid and base through neutralization reaction. The reaction between an acid and a base to form salt and water is called a neutralisation reaction. A pH value of less than 7 indicates an acidic solution, while greater than 7 indicates a basic solution. Question 4 The bulb does not glow in this case also. 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. i.e. (i) Take solutions of alcohols and glucose. Book : Science. 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 (H2CO3). 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) ? (d) Both X and Y are bases Now, since one of the compounds formed is calcium chloride, it shows that the metal compound is calcium carbonate. NCERT Solutions For Class 10 Science Chapter … < 7) and Yis a base (pH =10, i.e. Question 10 While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid? 1. Complete NCERT Book Page wise Solution Class 10th as per Latest CBSE Syllabus SCIENCE Chapter-11, The Human Eye and the Colourful World The following page provides you NCERT book solutions for Class 10 SCIENCE, SCIENCE Class 10 notes in pdf are also available in the related links between the texts. Solution: (b) HCl (a) Milk is made slightly alkaline so that it may not get sour easily due to the formation of lactic acid in it. Answer: Question 21 Even after revising all the chapters, students need to solve sample papers to score high marks. Question 19 The solution contains e.g NaHCO3 + HCl → NaCl + H2O + CO2 (ii) Baking soda is used for making baking powder (used in making cakes, bread, etc.). Question 3. Do basic solutions also have H+ (aq) ions ? No, the basic solution doesn’t have H+ ions as the solution has excess of hydroxide ions. Nuclear fusion reactions generate more energy than fission but are difficult to control. So, when an acid is added to water, the concentration of hydrogen ions in water increases. The gas evolved extinguishes a burning candle. (i) Baking soda is used as an antacid in medicines to remove acidity of the stomach. 220V is maintained between live wire which is insulated red and neutral wire which is insulated black. Author : Government Of Nepal (a) More than 5 The inner lining of stomach protects vital cells from the acidic pH which is developed by HCl secreted by stomach. Why does dry HCl gas not change the colour of the dry litmus paper ? The following observations were reported by the 4 students. Calcium hydroxide is the substance that on treatment with chlorine yields bleaching powder. … The solution which turns red litmus to blue will be a basic solution. Washing soda Question 1 Download Exemplar solutions for class 10 Maths in order to score good marks in CBSE board exams. What is a neutralisation reaction ? The contents of each test tube would be identified by change in colour of red litmus paper. If you want to score maximum marks in the examination the every chapter is important for you. Acids + Bases → Salt + water Question 13 (c) III ii. Question 12. Which one of the following would you need to identify the gas that evolve when you heat NaOH solution with zinc metal? Question 16 (vi) Repeat the experiment with glucose. The compounds such as glucose and alcohol also contain hydrogen but they do not show acidic character. Question 8 On the other hand, rain water conducts electricity. Answer: 11 < 9 < 7 < 4 < 1 Answer: (b) II And we know that a basic solution turns pH paper blue. 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. as an oxidising agent in chemical industry. > 7). What are the data files? (c) 12 mL 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 once. Answer: Plaster of Paris has a very remarkable property of setting into a hard mass on wetting with water. Uses of baking soda : Sodium carbonate (washing soda) is used for softening hard water. How do you think the pH will change as it turns into curd? (a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline ? (d) 16 mL, Question 4 NCERT Solutions for Class 10 Computer Science Chapter 10 String Data Manipulation pdf download, up board solutions for Class 10 computer science. NaOH + HCl → NaCl + H2O (d) dilute hydrochloric acid reacts with iron filing This is the basis of an electric motor. Write an equation to show the reaction between plaster of Paris and water. Which gas is usually liberated when an acid reacts with a metal? 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