Question 1 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: Acids + Metal → Salt + H2 Question 7. If the direction of the field and that of the current are mutually perpendicular to each other, then the force acting on the conductor will be perpendicular to both and will be given by Fleming’s left-hand rule. (d) dilute hydrochloric acid reacts with iron filing Question 2 If you are given only red litmus paper, how will you identify the contents of each test tube? The soap bubble bursts and hydrogen gas burns with a pop sound. Write an equation to show the reaction between plaster of Paris and water. Describe an activity to prove it. (vii) This means no ions or H+ ions are present in the solution. Which solution has more hydrogen ion concentration? (c) NH4Cl If, however, water is added to concentrated acid to dilute it, a large amount of heat is evolved at once. But, with help of technology, it can converted into Bio-gas, which is an efficient and pollution free fuel. (c) Antacid Answer: 11 < 9 < 7 < 4 < 1 So fizzing occurs more vigorously in test tube A . Answer: Question 16 The aqueous solutions of glucose and alcohol do not show acidic character because the hydrogen in them does not separate out as hydrogen ions [H+ (aq) ions] on dissolving in water. (ii) Put the blue litmus paper obtained above in the remaining two test-tubes, turn-by-turn. Sodium carbonate (washing soda) is used for softening hard water. (a) Antibiotic Answer: Question 26 (d) A Answer: (a) NaCl Dry HCl gas does not give H+ ions and therefore does not change the colour of dry litmus paper. (d) 16 mL give H+ ions in water while alcohol and glucose do not give H+ ion in water. Get NCERT Solutions and Notes for Class 10 Science - Physics, Chemistry and Biology. DC generator generates direct current as a cell. Question 2 The magnetic field may change due to a relative motion between the coil and a magnet placed near to the coil. (c) B Answer: Answer: The sign …………. Nuclear fusion reactions generate more energy than fission but are difficult to control. (a) X is a base and Y is an acid One of them contains distilled water and the other two contain an acidic solution and a basic solution respectively. The reaction between an acid and a base to form salt and water is called a neutralisation reaction. 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). Here we have given Karnataka SSLC Class 10 Science Solutions Chapter 5 Periodic Classification of Elements. Write word equations and then balanced equations for the reaction taking place when Question 3 (c) 5 (b) II Always add acid to water and not water to acid because this process is highly exothermic. (b) Why does this milk take a long time to set as curd ? NCERT Solutions for Chapter 1 Chemical reactions and Equations is the first chapter of Class 10 Science Textbook. Question 5. Equal pieces of zinc granules are dropped in four test tubes. Which of the following statements shows the property of an acid? Solution: (d) III Solution: Answer: The whole book is subdivided into four topics namely, Materials, The World of the Living, How Things Work, Natural Phenomena and Natural Resources or in the way of discipline we can state them in Chemistry, Biology, Physics and Environmental Science respectively. Four students I, II, III and IV were asked to examine the changes for blue and red litmus paper strips with dil. (c) Antacid, Question 5 Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. NCERT Solutions for Class 10 Computer Science Chapter 10 String Data Manipulation pdf download, up board solutions for Class 10 computer science. 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. A solution has pH value of 5. Question 18 Define the principal focus of a concave mirror. (d) KCl So, when water is added to plaster of Paris, it sets into a hard mass in about half an hour. Why does distilled water not conduct electricity, whereas rainwater does? (ii) It is used for removing permanent hardness of water. Why does dry HCl gas not change the colour of the dry litmus paper ? Answer: Mg(OH)2 + H2CO3 → MgCO3 + 2H2O. Also exists in the form of rock hence also known as rock salt. 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. Question 2. NCERT Solutions For Class 10 Science Chapter 10 Light Reflection and Refraction: In this article, you candidates can find light reflection and refraction class 10 NCERT solutions. Answer: NCERT Solutions for Class 10 Science Chapter 5- Periodic Classification Of Elements. (b) dilute hydrochloric acid reacts with magnesium ribbon The solution contains Name the sodium compound, which is used, for softening hard water. Lactic acid present in it reduces its pH value. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. After that, energy sources conventionally used, but improvised due to technology has been discussed. (c) Litmus paper Book : Science. (c) distilled water HCl (Solution A) and dil. The acid produces hydrogen ions only in the presence of water. Add about 5 mL dilute hydrochloric acid slowly. What effect does the concentration of H+ (aq) ions have on the nature of the solution ? Put the changed blue litmus paper in the solution which turns the blue to red will be the acidic solution. Why should curd and sour substances not be kept in brass and copper vessels ? Solution: The pH of this salt solution was found to be 7 by measuring the pH with a universal indicator paper. Though compounds like alcohol and glucose contain hydrogen but they do not ionise in the solution to produce H+ ions on passing current through them. Question 9 (b) HCl < 7) and Yis a base (pH =10, i.e. Question 8. Solution: The gas evolved extinguishes a burning candle. (c) Only seven Read on to find out NCERT Solutions for Class 10 Science Chapter 2 Exercise and Extra Questions. Answer: Examples: Question 15 Question 1 If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?Solution:Trait B appears to own arisen earlier because it is gift in larger fraction of the population. (b) Strongly alkaline What Do All Acids And All Bases Have In Common? The contents of each test tube would be identified by change in colour of red litmus paper. NCERT Solutions for Chapter 1 - Chemical Reactions and Equations, NCERT Solutions for Chapter 2 - Acids, Bases and Salts, NCERT Solutions for Chapter 3 - Metals and Non-metals, NCERT Solutions for Chapter 4 - Carbon and its Compounds, NCERT Solutions for Chapter 5 - Periodic Classification of Elements, NCERT Solutions for Chapter 6 - Life Processes, NCERT Solutions for Chapter 7 - Control and Coordination. Bleaching powder. This will make the plaster of Paris useless after some time. (iii) Strongly acidic? Nuclear energy can generated by controlled Nuclear fission reactions. Most often the soil in the fields is too acidic. Solution: Acids + Bases → Salt + water It is the fixed number of water molecules present in one formula unit of a salt e.g. Question 27 Fresh milk has a pH of 6. Solution: The solution which turns the blue litmus paper to red will be the acidic solution. Question 6 (a) 4 mL Sodium Hydroxide (NaOH) Rainwater, while falling to the earth through the atmosphere, dissolves an acidic gas carbon dioxide from the air and forms carbonic acid (H2CO3). (d) IV Now, since one of the compounds formed is calcium chloride, it shows that the metal compound is calcium carbonate. i. (d) As pH paper turns greenish blue for weakly basic compound and antacids contain weak base like Mg(OH)2. Answer: Electricity generation through magnet is discussed. Following substances are poured in all the four test tubes. NaOH + HCl → NaCl + H2O Answer: The different aspects is discussed. water of Crystallization : Answer: Energy can also be obtained from earth crust, known as geo-thermal energy. 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. 220V is maintained between live wire which is insulated red and neutral wire which is insulated black. You must well understood every single topic that will prove beneficial in higher classes. (v) The bulb does not glow. Thus, it will not affect the pH of the solution. Take some zinc granules in the test tube. Slaked lime Ca (OH)2. Question 1. (iv) Weakly acidic? What is a neutralization reaction? Among the given salts, only KCl is completely ionisable in the following manner: KCl (aq) → K+ + Cl A generator converts mechanical energy into electrical energy. When a given amount of an acid is added to water, there is a fixed number of hydronium ions per volume of the solution. Question 11 10H2O) : (b) Salts which are completely ionisable in water are said to be neutral salts and their pH is equal to 7. 2Fe (s) + 6HCl (aq) → 2FeCl3 (aq) + 3H2 (g). Distilled water does not conduct electricity because it does not contain any ionic compound (like acids, bases or salts) dissolved in it. (d) 10, Question 2 It works on the basis of electromagnetic induction. Answer: Question 1 Question 3 Thus, a farmer should add lime or slaked lime in his fields when the soil is too acidic. The inference that can be drawn is [CCE 2014] [CCE 2015 ]. Answer: (b) It is sour in taste Also in this article, you will find the Step-wise explanation for each and every question. The acid must be added slowly to water by constant shirring on. (a) It turns blue litmus to red Working on the light chapter of class 10 NCERT solutions will help candidates to build a … Since hydrochloric acid is a strong acid a large amount of hydrogen gas is liberated in the test tube A. The acidic behaviour of acids is due to the presence of hydrogen ions, [H+ (aq) ions], in them. (b) Both X and Y are acidic solutions Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test-tube A while acetic acid (CH3COOH) is added to test-tube B. Why do acids not show acidic behaviour in the absence of water ? Explain why? 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)? Thus, the metal compound A is calcium carbonate (CaCO3). Which solution has more hydrogen ion concentration? Question 5 Answer: (b) The alkaline milk takes a longer time to set into curd because the lactic acid being formed has to first neutralise the alkali present in it. The solution of acid thus formed will have more of hydrogen ions and it will be acidic in nature. (c) III 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). Give two important uses of washing soda and baking soda. It is often used as an electrolyte. The direction of the induced current is given by the Fleming’s right-hand rule. When an acid reacts with metal, a salt and hydrogen gas is formed. NaOH + HCl → NaCl + H2O While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid ? (a) More than 5 Fizzing occurs in the test tube due to the evolution of hydrogen gas by the action of acid on magnesium ribbon. e.g NaHCO3 + HCl → NaCl + H2O + CO2 How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted? Which is the most appropriate set up? NCERT Solutions for Chapter 9 - Heredity and Evolution, NCERT Solutions for Chapter 10 - Light – Reflection and Refraction, NCERT Solutions for Chapter 11 - Human Eye and Colourful World, NCERT Solutions for Chapter 12 - Electricity, NCERT Solutions for Chapter 13 - Magnetic Effects of Electric Current, NCERT Solutions for Chapter 14 - Sources of Energy, NCERT Solutions for Chapter 15 - Our Environment, NCERT Solutions for Chapter 16 - Sustainable Management of Natural Resources. Solving CBSE Sample Papers for Class 10 Science gives a brief idea on question paper pattern, marking scheme and types of questions asked in the exam. While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid? If yes, then why are these basic ? This shows that alcohols and glucose are not acids. Base + Non-metallic oxide → Salt + water Dry HCl gas does not contain any hydrogen ions in it, so it does not show acidic behaviour. Domestically it is used as a water softener during laundry. Question 11 Why is diffusion insufficient to meet the oxygen requirements of … The heat generated may cause the mixture to splash the acid on our face or clothes and cause acid burns. Answer: When passed through soap solution, it gets trapped into bubbles. HCl, HNO3, etc. Since ancient times, it’s been proved several times that Science has the capacity to revolutionize the phases of Mankind. If you want to score maximum marks in the examination the every chapter is important for you. Theses chapters are divided into 5 units. (ii) Strongly alkaline? Now that you are provided all the necessary information regarding NCERT Solutions for Class 10 Science Chapter 2 Activities and we hope this detailed article on NCERT Solutions For Class 10 Science Chapter 2 Acids And Bases is helpful. H2SO4 + CuO → CuSO4 + H2O, Bases + Metals → Salt + H2 Give the equation of the reaction involved ? The numerical value of gravitational constant (G) is 6.67*10-11 and its unit is Nm2/Kg2. In fact, dry HCl gas does not change the colour of dry litmus paper as it has no hydrogen ions [H+(aq) ions] in it. Explain your answer. Question 7 Download – NCERT Solutions for Class 10 Science Chapter 1: Chemical Reactions and Equations This chapter covers balancing of a chemical reaction, types of chemical reactions like Combination reactions, Decomposition reactions, Displacement reactions, Double displacement reactions and Redox reactions (Oxidation and Reduction reactions). Increasing order of hydrogen ion concentration Answer A pH value of less than 7 indicates an acidic solution, while greater than 7 indicates a basic solution. Carbonic acid provides hydrogen ions, H+(aq), and carbonate ions, CO2-3 (aq), to rain water. indicates no colour change. Answer: Solution: (ii) Baking soda is used for making baking powder (used in making cakes, bread, etc.). Answer: Uses of baking soda : NCERT Solutions for Chapter 8 - How do Organisms Reproduce? 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. Question 8 Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid (CH3COOH) is added to test tube B. (i) Take solutions of alcohols and glucose. So, an antacid would change the colour of this pH paper to greenish blue. A drop of a liquid sample was put on the pH paper. Plaster of Paris has a very remarkable property of setting into a hard mass on wetting with water. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The aqueous solution of an acid conducts electricity due to the presence of charged particles called ions in it. 10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HC1. Answer: Going through them will help you in getting a better understanding of how to solve problems. The acidic behaviour of acid is due to the presence of hydrogen ions. Diluting an acid should be done by adding concentrated acid to water gradually with stirring and not by adding water to concentrated acid. Answer: Question 1 Calcium carbonate reacts with dilute hydrochloric acid to form calcium chloride, carbon dioxide and water. (a) Na2CO3 In our houses we receive AC electric power of 220 V with a frequency of 50 Hz. What is the common name of the compound CaOCl2? (d) Antiseptic Solution: 1. Calcium hydroxide is the substance that on treatment with chlorine yields bleaching powder. This is the basis of an electric motor. Computer Hardware: The electronic and mechanical components that make up a computer are called hardware. The phenomenon of electromagnetic induction is the production of induced current in a coil placed in a region where the magnetic field changes with time. Write about their different types. Having proper knowledge of the theories, sufficient practice of the reactions, equations and formulas, and solving questions from the NCERT Chemistry books are very important if you want to score well in Science for Class 10 board exams as well as JEE and NEET. You have two solutions A and B. (iv) Now pour alcohol in the beaker and switch on the current. (UP 2007, 15) Or If it develops bubbles, the soil is too acidic. Ans: A coin and feather when dropped in vacuum falls simultaneously due to free fall as there is no external resistance in vacuum. NaOH (solution B) is a base which turns red litmus blue. Question 4 The acids like HCl, H2SO4, HNO3 and CH3COOH, etc., show acidic character because they dissociate in aqueous solutions to produce hydrogen ions, H+(aq) ions. • Used in glass, soap & paper indusby, removing Permanent hardness of water and cleaning agent. (v) Weakly alkaline? The compounds such as glucose and alcohol also contain hydrogen but they do not show acidic character. Question 13 Question 24 An acid is a substance, which dissociates on dissolving in water to produce hydrogen ions [H+(aq) ions]. In this category, we have energy sources like solar energy, in which energy is generated through solar cell and solar panel, or by solar cooker. What effect does the concentration of H+(aq) ions have on the nature of the solution? (i) Neutral? One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. Zn (s) + H2SO4 (aq) → ZnSO4 (aq) + H2 (g), (b) Magnesium ribbon + dil. 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. Sulphuric acid > Aluminium sulphate + Hydrogen Question 6 (c) Any solution having pH > 7 will be a base while the solution having pH < 7 will surely be an acid. Other options (a) and (b) contain acids and option (c) is a neutral salt. Question 10 Compounds such as alcohol and glucose also contain hydrogen but are not categorised as acids. Name the sodium compound which is used for softening hard water. (a) Red litmus solution Uses of washing soda : Therefore, alcohol and glucose do not show acidic character. How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted ? > 7). Answer: Answer: NCERT Solutions for Class 10 Science – Physics, Chemistry, Biology Science has its own history of completely transforming the entire world that we live in. The gas evolved extinguishes a burning candle. The third category is Non-conventional sources of energy. (b) 8 mL NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. The pH of solution A is 6 and pH of solution B is 8. Plaster of Paris (CaSO4. Identify the article which he is not supposed to pick. 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. Chemical Properties Of Acids Question 12. Domestic circuiting is discussed. Do basic solutions also have H+ (aq) ions ? (d) Petri dish A solution reacts with crushed-egg shells to give a gas that turns lime water milky. Examples: Answer: There are total 16 chapters in the Science Class 10 textbook that will help you in developing concepts about the various topics. The topics which are covered in this chapter are Chemical equation, Balanced chemical equation, implication of a balanced chemical equation, types of chemical reactions: Combination, decomposition, displacement, double … You can download the Class 10 Science NCERT Solutions PDF from studyrankers for free which will help you in looking into the specific question at your own ease. (a) Neutral The pH of mouth should be more than 5.5. Which of the following would change the colour of this pH paper to greenish blue? Going through the step-wise solutions for every question too is highly important to bag a good score. (ii) Illustration : Set up the apparatus as shown in the given figure. NCERT Solutions for Class 10 Science (Chemistry) Chapter 2 Acids, bases, and salts are part of NCERT Solutions for Class 10 Science. Used for making toys, material for decor action, smooth surfaces. (c) Strongly acidic Question 9 The pH will change to below 6, as lactic acid is formed when milk turns into curd. NCERT Solutions for Class 10 Chapter 2 Science Acids bases and salts In this chapter, students get hold of basic knowledge on Acids bases and salts. Question 1 2NaOH + Zn → Na2ZnO2 + H2 (d) As NaCl is a neutral solution due to its complete ionization in H2O and has pH = 7. If you are given only red litmus paper, how will you identify the contents of each test tube ? H2 gas is not soluble in water. Question 12 Two types of generators are discussed. (a) lemon juice Plaster of Paris should be stored in a moisture-proof container. (b) Dropper Illustrate with an example. (iii) Test for H2 gas : Publisher : Janak. Answer: (ii) Fix two nails on a cork, and place the cork in 100 mL beaker. Plaster of Paris should be stored in a moisture proof container. Sodium carbonate and carbon dioxide are evolved when sodium hydro carbonate is heated. It helps students in facing the exam more confidently. … Similarly, with the help of technology, wind energy can be harnessed by placing many wind mills in a large field creating a wind farm. (d) Lime water Answer: [NCERT Exemplar] (d) An acid turns blue litmus red. CuSO4.5H2O, Na2CO3.10H2O. fresh milk has a pH of 6. Question 14 Answer: (b) Vinegar Answer: (b) HCl (vi) Repeat the experiment with glucose. Adding water to a concentrated acid, the heat generated may cause the mixture to splash out and cause burns. Why do acids not show acidic behaviour in the absence of water? The salt is most likely to be (a) pH paper Solution: Bring a burning candle near the soap bubble filled with gas. Name the substance which on treatment with chlorine yields bleaching powder. Question 14 Here we have given Rajasthan Board Books RBSE Class 10th Solutions … (b) Strong adds like HCl react vigorously with active metals like Zn and form metal salt and evolve H2 gas. The inner lining of stomach protects vital cells from the acidic pH which is developed by HCl secreted by stomach. . You have two solutions A and B. You have been provided with three test tubes. NCERT Solutions for Class 10 Science. Which solution is? Question 6. Acetic acid (CH3COOH) is a weak acid whereas hydrochloric acid (HCl) is a strong acid. A solution turns red litmus blue, its pH is likely to be But these are far less in number than OH– ions that is responsible for their basic nature. So, when an acid is added to water, the concentration of hydrogen ions in water increases. 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This NCERT Solutions has questions-related to an electric cell, electric bulb, electric circuits, switches, conductors and insulators, examples of conductors and insulators. The correct observation would be of student Answer: It is used to test garden soil for acidity. As the answers are prepared by Studyrankers experienced experts, you can trust the answer and use it for improving your marks in the examinations. New solution and salts pdf should curd and sour substances not be kept in brass and copper?... That is responsible for their basic nature 20 Why does an aqueous solution of sodium hydro carbonate is.. Found to have pH value of 4 and 10 respectively cakes, bread etc! As glucose and alcohol also contain hydrogen but are not acids acid will not affect the slow setting of of... And earth wire is discussed compound is calcium chloride does this milk Take a Long time to as. H2 gas: H2 gas is evolved were asked to examine the changes for blue and litmus. 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If a solution of an acid and base combined in neutralization reaction Solutions for Class 10th: Ch 6 Processes! Is categorized under unit chemical substances – nature and behavior when excess base is dissolved a. In many organic and inorganic compounds formation of lactic acid during this process is highly important to bag a score. Have to face Class 10 Maths in order to score high marks, non-metals are studied more vigorously and?...

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