Two drinks P and Q gave acidic and alkaline reactions respectively. Answers and explanation of MCQ tests are given just below each questions. Write the chemical equation. Answer: 2C2H5OH + 2Na ————> 2C2H5ONa + H2. Answer. Answer: NaOH (Sodium hydroxide). (d) A brisk effervescence will be noticed due to the evolution of CO2 gas. In the following list of acids, separate strong acids from weak acids. Observe its colour. Answer. Antacids neutralizes excess of acid in our body and gives relief from hyperacidity. 9. Master this topic as you play. (b) It is because H2SO4 is strong acid. Mention its colour and the reason due to which it has this colour. NCERT Solutions for Class 10 Chapter 2 Acids, bases and salts are prepared to help students in their exam preparation. 6.Explain the action of dilute hydrochloric acid on the following with chemical equation: 6.Pass the gas evolved through lime water and note down your observations. 56.What is meant by ‘water of crystallisation’ of a substance ? It is obtained from sea water. 42.Compounds like alcohols and glucose also contain hydrogen but are not categorised as acids. Question from very important topics are covered by NCERT Exemplar Class 10.You also get idea about the type of questions and method to answer in your Class 10th … Write the name of the powder. 5.Cool the crystals and add few drops of water into it. Write a chemical equation to show the reaction between Plaster of Paris and water. Online Test. (a) Explain the following chemical properties of acids with the help of balanced chemical equations only. We try to provide online math tutoring for you. It is called sodium carbonate decahydrate or washing soda. Answer: (a) Write the chemical name and chemical formula of washing soda. A. Neutral: Potassium sulphate, Sodium chloride Acidic: Ammonium chloride Basic: Sodium carbonate, 33.A student dropped few pieces of marble in dilute HC1 contained in a test tube. 21. (CBSE 2017) Cool the crystals and add few drops of water into it. 168 times. He then dissolved a pinch of common salt in the same tube. H2 and Cl2 gases are liberated. Hold it with a clamp and heat the tube over a burner. (i) Explain why is hydrochloric acid a strong acid and acetic acid, a weak acid. Answer. Toothpaste and tooth powder are basic and neutralise acid formed in mouth which prevents tooth decay. 44.Which bases are called alkalies? 20. H2SO4 to produce effervescence, The gas evolved extinguishes a burning candle. Since CO2 is not a supporter of combustion, the burning splinter will be extinguished. Answer. 3.Heat crystals in boiling tube. Answer. (c) What happens when electricity is passed through brine? Answer: emetzger. The nature can be tested by adding a few drops of red litmus to the mixture. Answer.Take a beaker of 250 ml and place two nails fixed with the help of cork. delivery tube, test tube, clamp stand. Answer: See Video Explanation of Acids Bases and Salts. Substances that have a pH level of less than 7 are acidic in nature. (b) pH will decrease as it turns to curd because curd is acidic due to the presence of lactic acid. Observe vapours being condensed in test tube. (i) It is used as bleaching agent in paper and textile industries. (ii) Explain why aqueous solution of an acid conducts electricity. (ii) What will happen in the above observation made by you after ten minutes ? (a) Write the name given to bases that are highly soluble in water. (ii) Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does. Which of the following would change the colour of this pH paper to greenish-blue? Question 16. (a) State the chemical properties on which the following uses of baking soda are based: 5.A white coloured powder is used by doctors for supporting fractured bones. Answer. (i) Lemon and orange. Question 10. MCQs are important for the CBSE and other boards final exams. The evolved gas was passed through lime water. (iii) Weak electrolyte. Solution A — Orange; MCQ Questions for Class 10 Science with Answers were prepared based on the latest exam pattern. Answer:(i) B (ii) B (iii) Ammonium hydroxide Question 2: (i) What is basicity of an acid. Answer. Pale green is the colour of FeSO4.7H2O crystals. (i) Which solution contains solute molecules in addition to water molecules. • Connect the nails to the two terminals of a 6 volt battery as shown in figure. However, when a dry piece of sodium pellet is added to the liquid, a gas is evolved with brisk effervescence. The one which gives a brisk effervescence contains acetic acid while the other in which no effervescence is noticed contains ethyl alcohol. One has a pH value of 9 and the other has pH value of 3. It consist of sodium hyrogencarbonate and tartaric acid. (i) It is the negative logarithm of H+ … Explain. Question: In Class, We Calculated The PH Of Acid Rain Before The Industrial Revolution (i.e., Pco2 = 275 Ppm) And During The Middle Of The Century (i.e., Pco2 = 600 Ppm) Ignoring The Contribution O CO32-. (iv) Adding water to acid is highly exothermic. (c) A universal indicator will impart orange colour to acetic acid. How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal? (b) H2SO4 and HNO3    are strong acids. (CBSE 2016) Answer. Question 21. The tube which turns blue litmus red contains acetic acid while the other which does not change its colour is that of ethyl alcohol. Give balanced chemical equation for the changes. Sodium hydrogencarbonate (baking soda) on heating gives sodium carbonate which on recrystallisation gives washing soda. 11.A student detected the pH of four unknown solution A, B, C and D as follows 11, 5, 7 and 2. Answer: Question 24. (ii) It is used to make casts and moulds. For e.g Acidic substances such as vinegar, tamarind, lemon, etc. A student is studying the properties of acetic acid in his school laboratory. 10H2O  . Tartaric acid neutralizes the bitterness due to sodium carbonate produced. Answer. Conclusion : Crystalline substances have water of crystallization which are lost on heating. 32. Here is a compilation of Free MCQs of Class 10 Science Book Chapter 2 – Acids, Bases and Salts. pH is all around us. Material Required: CaCO3(marble chips), Woulfe-bottle, thistle funnel, dil. Answer. Question 7. There will not be any change in the colour of the pH paper. Solution E – Violet. Answer. Sodium hydrogencarbonate gives CO2 which makes cake soft and fluffy. Its chemical name is calcium oxychloride. Acids Bases and Salts Class 10, Summary, Explanation and Notes of Acids Bases and Salts Science Chapter 2 . (b) When water is added to the white solid X, product Y formed is calcium hydroxide. 34. Check the below NCERT MCQ Questions for Class 10 Science Chapter 2 Acids, Bases and Salts with Answers Pdf free download. Conclusion: Metal carbonates react with dilute acids to liberate carbon dioxide. How will you prove its liberation? Register online for Science tuition on Vedantu.com to score more marks in CBSE board examination. 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. State the colour change you are likly to observe on mixing the two solutions. Also give the reactions involved. As expected, the pH paper acquired green colour. Complete oxidation: When ethanol is warmed with dilute alkaline solution of potassium permanganate (5% solution) called Baeyer’s reagent, ethanoic acid or acetic acid is formed as the product. (i) When an acid reacts with a metal carbonate. Acids/Bases and Salts DRAFT. • Now add some water containing ethanol and put the switch ON. Hyperacidity is caused by excess of hydrochloric acid in stomach. 1.Name the acid present in the following: (i) Tomato (ii) Vinegar (iii) Tamarind Answer. Answer. A suspension of Y in water is applied to the walls of a house during white washing. (ii) Write its chemical formula. You are given two colourless solutions present in two test tubes. (ii)The process is called dilution. (ii) Why cake or bread swells on adding baking powder? Answer. (b) Give reason to support your answer. Procedure: A chemical is said to be acidic if it releases H + ions in its aqueous solutions. Smell. (b) How is it obtained from sodium chloride? Which of the following salts does not contain water of crystallisation? Name the process. (a) Soluble bases arp called alkalies, e.g. It reacts with water to form sodium hydroxide ‘B’ with formula NaOH. (a) Mention the pH range within which our body works. 49.Which gas is evolved when sodium hydrogencarbonate reacts with dilute hydrochloric acid? It can be used as test for CO2 .The chemical reactions taking place are as follows: Conclusion: The experiment shows glucose and ethanol do not ionise in aqueous solution, that is, they do not give H+ ions, therefore cannot conduct electricity. of blue crystals changes into white. 53.Why does 1 M HC1 solution have a higher concentration of H+ ions than 1 M CH3COOH solution? Write balanced Explain how antacid works. Question from very important topics are covered by NCERT Exemplar Class 10.You also get idea about the type of questions and method to answer in your Class 10th … Acids, Bases and Salts Notes of CBSE Class 10 Science Chapter with detailed explanation of the chapter ‘Acids, bases and salts' along with meanings of difficult words. You want to study a decomposition reaction by taking ferrous sulphate crystals in a boiling tube. Give reaction involved in its preparation. How is it prepared? (a) Five solutions A, B, C, D and E when tested with universal indicator showed pW as 4, 1, 11,7 and 9 … With the help of balanced chemical equations for all the changes explain the observations. What change would be observed in lime water? How? Name two aqueous solutions required for the experiment. (ii) Write the chemical equation for its preparation. CH3CH2OH +  (O)  —————– > CH3CHO + H2O. Online Practice. Printable worksheets with 10 questions in PDF format. Answer: Acids Bases and Salts important question for Class 10 Science PDF will help you in scoring more marks.. State the condition when it starts corroding. Give two examples. Identify ‘X’ and ‘Y\ Give the chemical equation of the reactions involved. Answer. This is chlor-alkali process. He then dissolved a pinch of common salt in the same tube. 51.Name the gas usually liberated when a dilute acid reacts with a metal. Question 3 Three solutions A,B and C have pH values of 6,4 and 10.Which of the solution is highly acidic? Compound ‘B’ gives a soluble compound ‘C’ on treatment with aluminium oxide. Iron has displaced copper from copper sulphate solution and has changed to iron sulphate which is light green in colour. 2.Observe its colour. Soluble bases are called alkalies, e.g. C. 10. (CBSE 2015) 27. 14. Given below are the Class 10 Science Solved Numerical Questions for electricity a. Concepts questions b. Calculation/Numerical problems c. Multiple choice questions d. Long answer questions e. Fill in the blanks Question 1 A wire of length 3 m and area of cross-section 1.7 × 10-6 m 2 has a resistance 3 × 10-2 ohm. What is the nature of soil? Answer. (a) HCl is acid and NaOH is base whose combination forms the common salt. Importance of pH. Also, write a balanced chemical equation for the reaction which occurred. 4.Observe vapours being condensed in test tube. It is used to determine the strength of aci d/base. Online Practice. A. • Repeat the experiment with glucose solution. Chemical Reaction : It is converted into washing soda by heating followed by crystallization. Practical Based Questions for Class 10 Science Chemistry. Copies of these textbooks may be downloaded and used as textbooks or … Take five test tubes and label them as A, B, C, D and E. Add 5 mL of five unknown solutions in them. Therefore, constant cooling should be done book Chapter 2 mcq ( Multiple Choice Questions ) acids! 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