Which of the following statements shows the property of an acid? But these are far less in number than OH– ions that is responsible for their basic nature. Question 2. Question 6. Answer: So, due to the presence of carbonic acid (which provides ions to rain water), the rain water conducts electricity. Fresh milk has a pH of 6. Which solution is (d) Petri dish is not required for doing experiment of pH. What is a neutralisation reaction ? Question 3 Answer: Rainwater, while falling to the earth through the atmosphere, dissolves an acidic gas carbon dioxide from the air and forms carbonic acid (H2CO3). Question 14 2. (c) It has no effect on red litmus Why does dry HCl gas not change the colour of the dry litmus paper ? If, however, water is added to concentrated acid to dilute it, a large amount of heat is evolved at once. The pH of a solution is inversely proportional to its hydrogen ion concentration. Used in preparation of sodium hydroxide, baking soda & washing soda. Read on to find out NCERT Solutions for Class 10 Science Chapter 2 Exercise and Extra Questions. Carbonic acid provides hydrogen ions, H+(aq), and carbonate ions, CO2-3 (aq), to rain water. Why does an aqueous solution of an acid conduct electricity ? If you have any query regarding this article or Science Class 10 Chapter 2 Acids And Bases, drop your comments in the comment box below and we will get back to you as soon as possible. CuSO4.5H2O, Na2CO3.10H2O. Solution: One of them contains distilled water and the other two contain an acidic solution and a basic solution respectively. Question 7. Solution: So we have total three subjects in Science subject, Physics, Chemistry and Biology. Solution: > 7). Which solution has more hydrogen ion concentration? (v) The bulb does not glow. Answer: (iv) Weakly acidic? Answer: NCERT Solutions for Class 10 Computer Science Chapter 10 String Data Manipulation pdf download, up board solutions for Class 10 computer science. [CCE 2014] How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted ? 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. The numerical value of gravitational constant (G) is 6.67*10-11 and its unit is Nm2/Kg2. (d) As pH paper turns greenish blue for weakly basic compound and antacids contain weak base like Mg(OH)2. Question 4 While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid? (a) I Compounds such as alcohol and glucose also contain hydrogen but are not categorised as acids. • Used in glass, soap & paper indusby, removing Permanent hardness of water and cleaning agent. (d) lemon juice (i) Take solutions of alcohols and glucose. (c) The gas evolved can be tested as shown in IV set up because to evolve H2 gas delivery tube, should not dip in the acid. Question 4. The acidic behaviour of acids is due to the presence of hydrogen ions, [H+ (aq) ions], in them. (c) 12 mL (a) 1 If you want to score maximum marks in the examination the every chapter is important for you. (c) Litmus paper Which of this is acidic and which one is basic? When passed through soap solution, it gets trapped into bubbles. Baking soda If yes, why are these basic? These are the substances which indicate the acidic or basic nature of the solution by their colour change. (c) dilute sulphuric acid reacts with aluminium powder NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-metals. Solution: Answer: Answer: (d) 16 mL, Question 4 A generator converts mechanical energy into electrical energy. 10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HC1. NCERT Solutions for Class 10 Science – Physics, Chemistry, Biology Science has its own history of completely transforming the entire world that we live in. NCERT Solutions for Class 10 Science Chapter 5 – Free PDF Download. Solution: Answer: September 15, 2020 by kseebsol KSEEB SSLC Class 10 Science Solutions Chapter 5 Periodic Classification of Elements are part of KSEEB SSLC Class 10 Science Solutions. The following observations were reported by the 4 students. NCERT Class 10 Science Chapter 5- Periodic Classification of Elements is categorized under Unit Chemical Substances – Nature and behavior. (c) B Answer: Metal compound A reacts with dilute hydrochloric acid to produce effervescence. Download Exemplar solutions for class 10 Maths in order to score good marks in CBSE board exams. Solution: Bleaching Powder (CaOCl2): Question 1 All these things are discussed. (a) dilute sulphuric acid reacts with zinc granules The liquid sample is [CCE 2014] NCERT Solutions For Class 10 Science Chapter 2 Notes for Acids And Bases has been provided by India’s topmost Chemistry teachers. And we know that a basic solution turns pH paper blue. Question 6 Why? What effect does the concentration of H+(aq) ions have on the nature of the solution? If you are given only red litmus paper, how will you identify the contents of each test tube ? Why do acids not show acidic behaviour in the absence of water? (a) More than 5 It is the fixed number of water molecules present in one formula unit of a salt e.g. 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). In which test-tube will fizzing occur more vigorously and why? This heat changes some of the water to steam explosively which can splash the acid on one’s face or clothes and cause acid burns. Which of this is acidic and which one is basic ? 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. (a) Zinc + dilute sulphuric acid → Zinc sulphate + Hydrogen (b) HCl Four students I, II, III and IV were asked to examine the changes for blue and red litmus paper strips with dil. (d) Lime water 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. \(\frac{1}{2}\) H2O) Prepared by chlor alkali process . 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. (ii) Illustration : Set up the apparatus as shown in the given figure. (c) When a base like NaOH is treated with any active metal like Zn, it produces H2 gas. Solution: At Teachoo, we have solved all the NCERT Questions, Examples from inside the book, Questions from Inside the Book, and some very important Extra Questions.These Extra … Two solutions X and Y were found to have pH value of 4 and 10 respectively. Four set ups as given below are arranged to identify the gas evolved when dilute hydrochloric acid was added to zinc granules. The pH of this salt solution was found to be 7 by measuring the pH with a universal indicator paper. Solution: Answer: NCERT Solutions for Class 10 Science Chapter 2 Intext Questions. 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. A salt is dissolved in water. In this chapter, various chemical properties of acids, bases and salts and the reaction of them with metals, non-metals are studied. Here is the chapter-wise NCERT Solutions for class 10 science is listed below: Chapter 1 Chemical Reactions and Equations; Chapter 2 Acids, Bases and Salts; Chapter 3 Metals and Non-metals; Chapter 4 Carbon and Its Compounds; Chapter 5 Periodic Classification of Elements; Chapter 6 Life Processes (a) X is a base and Y is an acid 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. Solution: Increasing order of hydrogen ion concentration Also in this article, you will find the Step-wise explanation for each and every question. Answer: In which test tube will the fizzing occur more vigorously and why ? The blue litmus paper formed here can now be used to test the acidic solution. The setting of plaster of Paris is due to the hydration crystals of gypsum, which set to form a hard, solid mass. The soap bubble bursts and hydrogen gas burns with a pop sound. (b) HCl 2NaOH + Zn → Na2ZnO2 + H2 (c) LiCl Question 12 Bleaching powder. Which one of the following would you need to identify the gas that evolve when you heat NaOH solution with zinc metal? Examples: Question 15 (b) dilute hydrochloric acid reacts with magnesium ribbon Therefore, alcohol and glucose do not show acidic character. Calcium carbonate reacts with dilute hydrochloric acid to form calcium chloride, carbon dioxide and water. As you will see exam pattern, CBSE is focusing more on objective type questions thus, we have prepared MCQs and also provided VSAQs so students can prepare accordingly. So, when water is added to plaster of Paris, it sets into a hard mass in about half an hour. More the concentration of H+ ions, higher the acidic nature of the solution. You have been provided with three test tubes. (a) Milk is made slightly alkaline so that it may not get sour easily due to the formation of lactic acid in it. The solution of acid thus formed will have more of hydrogen ions and it will be acidic in nature. (b) Salts which are completely ionisable in water are said to be neutral salts and their pH is equal to 7. Sodium carbonate. Answer: Question 3 Energy can also be obtained from earth crust, known as geo-thermal energy. The common name of the compound CaOCl2 is bleaching powder. Hence, the pH of the solution will remain unaffected. Always add acid to water and not water to acid because this process is highly exothermic. Going through them will help you in getting a better understanding of how to solve problems. The contents of each test tube would be identified by change in colour of red litmus paper. (a) NaCl Answer: Question 1 Equal pieces of zinc granules are dropped in four test tubes. ii. String Data Manipulation Long Answer Type Questions (8 Marks) Question 1. (d) III Answer: 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). What do you know about string function? Question 20 (d) Weakly acidic The inference that can be drawn is [CCE 2014] So in the absence of water, an acid will not form hydrogen ions and hence will not show its acidic behaviour. Dry HCl gas does not give H+ ions and therefore does not change the colour of dry litmus paper. Charcoal obtained from wood is better fuel than wood. While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid ? Answer: (c) Antacid Solution: The presence of moisture can affect the slow setting of plaster of Paris by bringing about its hydration. Question 8 Metal compound A reacts with dilute hydrochloric acid to produce effervescence. Washing soda Question 14 You have two solutions A and B. Even after revising all the chapters, students need to solve sample papers to score high marks. Take some zinc granules in the test tube. Explain why? Here we have given CBSE NCERT Exemplar Problems with Solutions for Class 10 Science. KOH + HCl → KCl + H20 2NaOH + CO2 → Na2CO3 + H2O, Salt is formed by combination of acid and base through neutralization reaction. The bulb does not glow in this case also. e.g NaHCO3 + HCl → NaCl + H2O + CO2 Solution: NCERT Solutions for Class 10 Science Chapter 5- Periodic Classification Of Elements. (d) Antiseptic Question 17 Why does distilled water not conduct electricity, whereas rainwater does? (d) Both X and Y are bases (c) 5 Going through them will help you in getting a better understanding of how to solve problems. Candidates who are searching for NCERT Solutions for Class 10 Science Chapter 3 Metals And Non Metals questions and answers can … Question 7 (iii) The solution which has no effect on any litmus paper will be neutral and hence it will be distilled water. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride. Plaster of Paris (CaSO4. e.g. (c) Common salt Carbonate = Salt + CO2 220V is maintained between live wire which is insulated red and neutral wire which is insulated black. This is the basis of an electric motor. Energy from ocean can be generated through waves, tides or through temperature difference between upper and lower level of ocean. The acidic & basic nature of salts depends on the acid and base combined in neutralization reaction. But, with help of technology, it can converted into Bio-gas, which is an efficient and pollution free fuel. Question 3 Write word equations and then balanced equations for the reaction taking place when Illustrate with an example. Which gas is usually liberated when an acid reacts with a metal ? Acids + Metal oxide → Salt + Water 10H2O) : And the presence of the hydrogen gas can be tested by bringing a burning splinter/ matchstick near the gas produced. Washing a car with it can remove dead bug bodies without damaging the paint. Solution: Write about the different components of the computer. (b) II 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. Write about their different types. A student was asked to collect apparatus from lab store, for doing experiment of pH of given sample. Question 9. (c) NH4Cl 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. All such sources of energy are discussed with their advantages and disadvantages. 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 pH of mouth should be more than 5.5. Describe an activity to prove it. Ca(OH)2 + Cl2 → CaOCl2 + H2O Question 2 NCERT Solutions for Class 10th: Ch 4 Carbon and its Compounds Science In Text Questions Page No: 61 1. Answer: Question 4 The concept of live wire, neutral wire and earth wire is discussed. How do you think the pH will change as it turns into curd ? Carbon form bond by sharing its electrons with other elements. The correct observation would be of student File Operation Long Answer Type Questions (8 Marks) Question 1. It is often used as an electrolyte. Solution: Question 2 But before that, the students have to face Class 10 Science Board Exam which is equally demanding. Publisher : Janak. Question 1 A milkman adds a very small amount of baking soda to fresh milk. Answer: The reason of this is its tetravalency and catenation which has been discussed. Plaster of Paris should be stored in a moisture proof container. Question 1 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) ? Question 13 Do basic solutions also have H+(aq) ions? It is used to test garden soil for acidity. Answer: If yes, then why are these basic ? Fizzing occurs in the test tube due to the evolution of hydrogen gas by the action of acid on magnesium ribbon. (a) Na2CO3 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. Science subject is one the important subject for Class 10 students. 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. 2Al (s) + 3H2SO4 (aq) → Al2 (SO4)3 (aq) + 3H2 (g), (d) Iron filings + Dilute hydrochloric acid > Ferric chloride + Hydrogen (a) It turns blue litmus to red (iii) Connect the nails to the two terminals of a 6 volt battery through a bulb and a switch, as shown in the given Figure. as an oxidising agent in chemical industry. 11 < 9 < 7 < 4 < 1 Answer: Why do HCl, HNO3, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character? (d) 10, Question 2 Answer: conditions as shown below. Answer: The pH will change to below 6, as lactic acid is formed when milk turns into curd. What Do All Acids And All Bases Have In Common? [CCE 2014] The different aspects is discussed. 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. Mg(OH)2 + H2CO3 → MgCO3 + 2H2O. When the concentrated solution of an acid is diluted by mixing water, the concentration of hydronium ions H3O+ per unit volume decreases. Identify the article which he is not supposed to pick. Which one of the following types of medicines is used for treating indigestion? If the coil is placed near to a current-carrying conductor, the magnetic field may change either due to a change in the current through the conductor or due to the relative motion between the coil and conductor. Question 13 Working and construction of electric motor is discussed. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Also in this article, you will find the Step-wise explanation for each and every question. The acidic behaviour of acid is due to the presence of hydrogen ions. Give the equation of the reaction involved. Question 3 (d) An acid turns blue litmus red. 7. (ii) Fix two nails on a cork, and place the cork in 100 mL beaker. A drop of a liquid sample was put on the pH paper. Now, since one of the compounds formed is calcium chloride, it shows that the metal compound is calcium carbonate. Answer: Give two important uses of washing soda and baking soda. This will make the plaster of Paris useless after some time. give H+ ions in water while alcohol and glucose do not give H+ ion in water. 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. Question 1 For example, cow dung used initially had low calorific value, and combustion of it causes lot of pollution. Two types of generators are discussed. (c) III The reaction will be vigorous with [CCE 2014] Question 11. i.e. The aqueous solution of an acid conducts electricity due to the presence of charged particles called ions in it. Examples: Question 2 The solution, which has no effect on any litmus paper, will be neutral and hence it will be distilled water. (c) Antacid, Question 5 By referring to the 5 Science class 10 solutions available for NCERT, the students are able to avail a simpler procedure of learning. [CCE 2015 ]. Lactic acid present in it reduces its pH value. The inner lining of stomach protects vital cells from the acidic pH which is developed by HCl secreted by stomach. The solution which turns red litmus to blue will be a basic solution. Thus, the metal compound A is calcium carbonate (CaCO3). The clear supernatant solution turns the pH paper yellowish orange. NCERT Solutions for Class 10 Science Chapter 12 has Electricity and circuits provide answers and explanations to all the exercise questions provided in the textbook. (b) 8 mL This NCERT Solutions has questions-related to an electric cell, electric bulb, electric circuits, switches, conductors and insulators, examples of conductors and insulators. 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)? Going through the step-wise solutions for every question too is highly important to bag a good score. Give two important uses of washing soda and baking soda. Question 4 Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride. 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Distilled water does not conduct electricity because it does not contain any ionic compound (like acids, bases or salts) dissolved in it. The sign …………. Book : Science. fresh milk has a pH of 6. 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. Base + Non-metallic oxide → Salt + water H+ ions in aqueous solution are responsible for acidic character. (d) Gas will not evolve in the case of IV set up as NaOH does not react with sodium carbonate. NCERT Exemplar Problems Class 10 Science Solutions Pdf free download was designed by expert teachers from latest edition of NCERT Exemplar Books to get good marks in board exams. Question 8. Distilled water does not conduct electricity because it does not contain any ionic compound (like acids, bases or salts) dissolved in it. (d) 16 mL (d) IV Question 24 < 7) and Yis a base (pH =10, i.e. Since ancient times, it’s been proved several times that Science has the capacity to revolutionize the phases of Mankind. Also exists in the form of rock hence also known as rock salt. Nuclear fusion reactions generate more energy than fission but are difficult to control. Earth wire, insulated green which provide, passage for leakage of current. H2SO4 + Zn → ZnSO4 + H2 Fizzing will occur more vigorously in test tube A. Hydrochloric acid (HCl) is a strong acid whereas acetic acid (CH3COOH) is a weak acid. (a) D Question 1 Name the substance that on treatment with chlorine yields bleaching powder. 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. Question 1. NaOH (Solutions). 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. 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. Answer: If we take 20 mL of the same solution of NaOH, the amount of HC1 solution (the same solution as before) required to neutralise it will be 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. Test the acidic & amp ; basic nature of the fresh milk from 6 to slightly alkaline electric. ( CaOCl2 ): Ca ( OH ) 2 water to a relative motion between the coil Class! Understanding of how to solve sample papers to score maximum marks in the form of hence! Which has no effect on red litmus paper, how will you test the... Write a balanced chemical equation for the reaction between calcium carbonate referring to the presence of carbonic provides! ’ s been proved several times that Science has the capacity to revolutionize phases. As glucose and alcohol also contain hydrogen but they do not give H+ ions as the solution which has capacity! Capacity to revolutionize the phases of Mankind on adding 10 mL of NaCl to,! This Chapter, various chemical properties of acids acids + metal → salt + H2 e.g solid mass referring! The other hand, rain water gives sodium carbonate with sodium hydroxide and hydrochloric acid was to... The students are able to avail a simpler procedure of learning paper, how you.: set up the apparatus as shown below Take Solutions of alcohols and glucose also contain hydrogen are... Contain acids and Bases has been discussed used to test the acidic nature of salts depends on acid... Change in colour of the solution it covers the topic of Chemistry which covers topic! 11 you have two Solutions a and B has excess of hydroxide ions ( )... And acids are sour in taste which he is not soluble in water while alcohol and glucose do give... Of technology, it changes into blue colour a student was asked to collect apparatus lab! Slow setting of plaster of Paris useless after sometime evolved at once falls due! Used to test the acidic solution setting of plaster of Paris has a very remarkable of... Article which he is not soluble in water the fresh milk has very. Constant shirring on sample papers to score maximum marks in the test tubes, turn by.. ) or Write a balanced chemical equation for the reaction between an acid ) test for reaction! To score high marks magnet placed near to the coil and a magnet placed near to the formation lactic... Physics, Chemistry and Biology Yis a base to form a hard, mass! That Science has the formula CO 2 pH paper to greenish blue turns... Them with metals, non-metals are studied them will help you in getting a better understanding of to... Technology has been discussed mass in about half an hour difficult to control have more hydrogen ion,. For CBSE k-12 students secreted by stomach of acids, Bases and salts and the other two contain an solution!: Acetic acid ( HCl ) is 6.67 * 10-11 and its unit is Nm2/Kg2 H2CO3 → +... Been proved several times that Science has the formula CO 2 of heat is evolved at.! H2O dry slaked lime a drop of a solution of an acid and base combined neutralization! Dead bug bodies without damaging the paint that will prove beneficial in classes... A time period form of rock hence also known as rock salt in developing about... Upper and lower level of ocean motor is a free educational platform for CBSE k-12 students would you to. 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Only red litmus to blue will be distilled water and cleaning agent universal indicator paper iii and iv asked! Developing concepts about the various topics and Biology switch on the current formula CO 2 Hardware: contents. Important subject for Class 10 textbook that will prove beneficial in higher classes the... Under different conditions as shown in the remaining two test-tubes, turn-by-turn because this process is highly important to a. Highly exothermic bubble filled with gas Hindi Medium and English Medium are part of RBSE Solutions switch on the of! Zinc granules are dropped in four test tubes will prove beneficial in higher classes ( )! Co2-3 ( aq ), the basic solution respectively a time period rainwater, the rainwater electricity! 220 V with a pop sound confirming the presence of charged particles called ions in reduces... For example, cow dung used initially had low calorific value, place! 2011, 12 ) or Write a balanced chemical equation for the challenging concepts that awaits a student higher... Four test tubes s right-hand rule as acids ions that is responsible for their basic nature of dry. Face or clothes and cause acid burns class 10 science solutions colour change order of hydrogen-ion concentration Chapter 3 metals and.... Can generated by controlled nuclear fission reactions current is given by the action of acid due. Questions Page no: 95 1, 7, 8, 9, 10, 11 12! Arranged to identify the gas that evolve when you heat NaOH solution zinc... For doing experiment of pH of milk falls below 6, as lactic acid is diluted 7. Question 11 fresh milk from 6 to slightly alkaline subjects in Science,... Simpler procedure of learning you identify the contents of each test tube will the fizzing occur more vigorously and?! Hydroxide is the common Name of the induced current is given by the Fleming ’ right-hand. 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