7. The acidic & basic nature of salts depends on the acid and base combined in neutralization reaction. File Operation Long Answer Type Questions (8 Marks) Question 1. The reaction between an acid and a base to form salt and water is called a neutralisation reaction. (a) I Lactic acid present in it reduces its pH value. Solution: Answer: Zn (s) + H2SO4 (aq) → ZnSO4 (aq) + H2 (g), (b) Magnesium ribbon + dil. Answer: Why do acids not show acidic behaviour in the absence of water ? (b) HCl, Question 3 Solution: Why? (b) II (b) Strong adds like HCl react vigorously with active metals like Zn and form metal salt and evolve H2 gas. Question 5 (d) CH3COONa The reason of this is its tetravalency and catenation which has been discussed. (c) IV (a) I 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 … (b) II Question 5. (b) Dropper Generally speaking, Chemical Reactions and Equations, Carbon and its Compounds, Periodic Classification of Elements, Life Processes, Light, Electricity are some of the important chapters in this book. Answer: Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. What is a neutralization reaction? It is used to test garden soil for acidity. indicates no colour change. KOH + HCl → KCl + H20 water of Crystallization : Question 7. 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 1. (d) IV Question 2 It helps students in facing the exam more confidently. It is a basic solution. The solution which turns the blue litmus paper to red will be the acidic solution. What Do All Acids And All Bases Have In Common? Answer: Hence, it can be concluded that X is an acid (pH=4, i.e. (i) Hydrogen (H2) gas is liberated when an acid reacts with a metal. Give two important uses of washing soda and baking soda. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride. Name the substance which on treatment with chlorine yields bleaching powder. Which is the most appropriate set up? NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Answer: • Used in glass, soap & paper indusby, removing Permanent hardness of water and cleaning agent. Washing Soda (Na2CO3. (a) Red litmus solution Question 1 (a) I Chemical Properties Of Acids Download Exemplar solutions for class 10 Maths in order to score good marks in CBSE board exams. 1. Answer: All these things are discussed. 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). Used in preparation of sodium hydroxide, baking soda & washing soda. Working on the light chapter of class 10 NCERT solutions will help candidates to build a … Therefore, the reaction between calcium carbonate and hydrochloric acid is. Question 7 fresh milk has a pH of 6. (c) 5 The setting of plaster of Paris is due to the hydration crystals of gypsum, which set to form a hard, solid mass. … Question 12. 2NaOH + Zn → Na2ZnO2 + H2 (e) Weakly alkaline (d) An acid turns blue litmus red. 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. (a) Antibiotic Question 2. Question 2 Question 19 Why do acids not show acidic behaviour in the absence of water? 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). The acid must be added slowly to water by constant shirring on. String Data Manipulation Long Answer Type Questions (8 Marks) Question 1. The soap bubble bursts and hydrogen gas burns with a pop sound. Answer: ii. Solution: 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. Solution of sodium hydrogen carbonate on heating gives sodium carbonate and carbon dioxide gas is evolved. Download NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases and Salts PDF. Always add acid to water and not water to acid because this process is highly exothermic. AC generators generates Alternating Current whose direction keep on changing after a time period. Question 9 Question 6 Hence, due to the presence of carbonic acid which provides ions to rainwater, the rainwater conducts electricity. This NCERT Solutions has questions-related to an electric cell, electric bulb, electric circuits, switches, conductors and insulators, examples of conductors and insulators. Basic solutions have H+ (aq) ions. (c) B (c) III Answer: Answer: 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. (d) IV It is often used as an electrolyte. NCERT Solutions for Chapter 8 - How do Organisms Reproduce? Nuclear fusion reactions generate more energy than fission but are difficult to control. Answer: Uses of washing soda : (a) 1 Answer: 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). NCERT Solutions for Class 10th: Ch 4 Carbon and its Compounds Science In Text Questions Page No: 61 1. Carbon form bond by sharing its electrons with other elements. The pH of solution A is 6 and pH of solution B is 8. Answer: Arrange the pH in increasing order of hydrogen ion concentration. Also exists in the form of rock hence also known as rock salt. Do basic solutions also have H+ (aq) ions ? Soon the reaction between zinc and hydrochloric acid starts and hydrogen gas is evolved. Put the changed blue litmus paper in the solution which turns the blue to red will be the acidic solution. A sample of soil is mixed with water and allowed to settle. Give two examples. Hence, the pH of the solution will remain unaffected. Which of this is acidic and which one is basic ? If you want to score maximum marks in the examination the every chapter is important for you. Mg(OH)2 + H2CO3 → MgCO3 + 2H2O. Question 12 (c) The correct observation is taken by student III because HCl (solution A) is an acid which turns blue litmus red and dil. Question 26 Why does distilled water not conduct electricity, whereas rainwater does? Why does an aqueous solution of acid conduct electricity? 1. DC generator generates direct current as a cell. (d) 16 mL, Question 4 (ii) Illustration : Set up the apparatus as shown in the given figure. This can be written as: Question 5 NCERT Solutions Class 10 Science is very helpful for students in covering full syllabus. It was observed that the colour of the pH paper turned blue. (a) dilute sulphuric acid reacts with zinc granules Also in this article, you will find the Step-wise explanation for each and every question. Question 4 Here we have given Karnataka SSLC Class 10 Science Solutions Chapter 5 Periodic Classification of Elements. If you are given only red litmus paper, how will you identify the contents of each test tube? How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted ? 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. Solution: Question 11 Working and construction of electric motor is discussed. Solution: NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-metals. Why does dry HCl gas not change the colour of the dry litmus paper? Why should curd and sour substances not be kept in brass and copper vessels ? (b) 8 mL These are the substances which indicate the acidic or basic nature of the solution by their colour change. 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. NCERT Solutions for Class 10th: Ch 6 Life Processes Science In Text Questions Page No: 95 1. The salt is most likely to be The solution contains (a) Na2CO3 Question 3 Which gas is usually liberated when an acid reacts with a metal? Other options (a) and (b) contain acids and option (c) is a neutral salt. Acids produce hydrogen ions in water. Answer: Answer: Here we have given Class 10 Science NCERT Solutions Chapter 2. 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. Plaster of Paris should be stored in a moisture-proof container. (b) Both X and Y are acidic solutions You have two solutions A and B. (b) Strongly alkaline The inference that can be drawn is [CCE 2014] Question 14 Calcium hydroxide is the substance that on treatment with chlorine yields bleaching powder. Four set ups as given below are arranged to identify the gas evolved when dilute hydrochloric acid was added to zinc granules. Here we have given CBSE NCERT Exemplar Problems with Solutions for Class 10 Science. Explain why? Most often the soil in the fields is too acidic. thus, we have prepared. The pH of solution A is 6 and pH of solution B is 8. A student was asked to collect apparatus from lab store, for doing experiment of pH of given sample. So, when an acid is added to water, the concentration of hydrogen ions in water increases. Why does dry HCl gas not change the colour of the dry litmus paper ? Distilled water does not conduct electricity because it does not contain any ionic compound (like acids, bases or salts) dissolved in it. The inner lining of stomach protects vital cells from the acidic pH which is developed by HCl secreted by stomach. When passed through soap solution, it gets trapped into bubbles. Write an equation to show the reaction between plaster of Paris and water. (b) Why does this milk take a long time to set as curd ? (c) 12 mL So, when water is added to plaster of Paris, it sets into a hard mass in about half an hour. (i) Baking soda is used as an antacid in medicines to remove acidity of the stomach. Following substances are poured in all the four test tubes. Since solution A has more hydrogen ion concentration, solution A is acidic and solution B is basic. Answer: (a) D Lower pH of sour & sweet food can cause tooth decay. Answer: Distilled water does not conduct electricity because it does not contain any ionic compound (like acids, bases or salts) dissolved in it. The solution which turns red litmus to blue will be a basic solution. How will you test for the presence of this gas ? How do you think the pH will change as it turns into curd ? (ii) It is used for removing permanent hardness of water. Question 15 Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride. (b) dilute hydrochloric acid reacts with magnesium ribbon Name the sodium compound, which is used, for softening hard water. This will make the plaster of Paris useless after some time. Bleaching powder. Solution: Solution: (b) Vinegar Diluting an acid should be done by adding concentrated acid to water gradually with stirring and not by adding water to concentrated acid. 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) ? Energy can also be obtained from earth crust, known as geo-thermal energy. The direction of the induced current is given by the Fleming’s right-hand rule. 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