(e) Out of the two acids taken above Question 17. Answer: Question 22. It neutralizes excess of acid formed in the stomach. Answer. Why? (iii) to make bread and cake soft and spongy. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 10.. (b) When this white powder is mixed with water a hard solid mass is obtained. You are provided with two samples of hard water; one containing temporary hardness and the other permanent hardness. (c) pH paper will become blue in ‘C’ and green in ‘D’. Pale green is the colour of FeSO4.7H2O crystals. They neutralize the acid formed in mouth which causes tooth decay. a. Sodium hydrogencarbonate (baking soda) on heating gives sodium carbonate which on recrystallisation gives washing soda. Answer. (i) Citric acid. (b) What could be the product Y ? (a) Mention the pH range within which our body works. (b) Write the balanced chemical equation qf chlor-alkali process. A. You want to perform an experiment to study a double displacement reaction in your school laboratory. 13.Equal length of magnesium ribben are taken in two test tubes ‘A’ and ‘B\ H2SO4 is added to test tube ‘A’ and H2CO3 in the test tube ‘B’ in equal amounts: The question asks us to find the pH of the solution, so we will need to convert pOH to pH. Unlimited adaptive online practice on this topic. (i) Dry pellets of a base ‘X’ when kept in bpen absorbs moisture and turns sticky. (b) HCl, HNO3ionise in aqueous solution, whereas alcohol and glucose do not show acidic characters because they do not ionise in aqueous solution. Answer. (c) It takes longer time to set as curd as bacteria do not work well in presence of sodium hydrogencarbonate, i.e. Substances that have a … Give equations of related reactions. Write balanced chemical equation. 6.Explain the action of dilute hydrochloric acid on the following with chemical equation: The evolved gas was then passed through lime water. Class 10 Science Chapter 2 MCQ (Multiple Choice Questions) of Acids, Bases and Salts. 2.15 mL of water and 10 mL of sulphuric acid are to be mixed in a beaker Sodium hydrogencarbonate gives CO2 which makes cake soft and fluffy. Answer. What will be the expected change in colour of the pH paper ? (b) distilled water Take 2g of CuS04.5H20 in a boiling tube fitted in a clamp stand. To show crystalline salts contain water of crystallisation. (i) Lime water will turn milky due to formation of calcium carbonate. Edit. Material Required: CaCO3(marble chips), Woulfe-bottle, thistle funnel, dil. RD Sharma Solutions , RS Aggarwal Solutions and NCERT Solutions, July 27, 2018 by Prasanna Leave a Comment. Write a chemical equation to show the reaction between Plaster of Paris and water. (a) A will show vigorous reaction. washing … Answer. All metal carbonates and hydrogen carbonates react with acids to form corresponding salts, water and carbon dioxide. It becomes dirty white on heating due to loss of water molecules and it becomes amorphous. A student dipped a strip of pH paper in distilled water taken in a tube. Answer: Question 9. Get shields, trophies, certificates and scores. Strong acid: HCl, HNO3,H2SO4 Weak acid: Citric acid, acetic acid, formic acid. Answer: 3. Give reaction involved in its preparation. Answer. Answer: MCQ Questions for Class 10 Science: Ch 2 Acids, Bases and Salts. What happens when food particles left in the mouth after eating degrade? (a) The white solid X is quick lime. Aim: To show crystalline salts contain water of crystallization. (b) C (10-12) < B (10-9) < D (10-7) < A (10-6) (i) Tomato (ii) Vinegar (iii) Tamarind (ii) Which solution could be a solution of glacial acetic acid ? Since CO2 is not a supporter of combustion, the burning splinter will be extinguished. (c) Name the gas liberated in both the tubes. Choose strong acid and strong base from the following: CH 3 COOH, NH 4 OH, KOH, HCI Answer: Strong acid—HCI, Strong base—KOH. The one which produces lather contained temporary hardness while the other in which no lather is formed, contained permanent hardness. Answer. Without the help of any chemical, how will you identify the nature of the sample. Answer. (b) Baking … Name the acid and base from which the following salts have been formed : Question 4. Answer: (i) Identify the compound. (CBSE 2014) Answer. Answer. H2SO4 to produce effervescence, The gas evolved extinguishes a burning candle. The nature can be tested by adding a few drops of red litmus to the mixture. The food particles which are left in mouth form acids which cause tooth decay. Online Practice. Answer.Hydrogen gas is liberated when active metal reacts with dilute hydrochloric acid. Name the type of reaction occurs when X is treated with dilute hydrochloric acid. 53.Why does 1 M HC1 solution have a higher concentration of H+ ions than 1 M CH3COOH solution? (i) Tap water conducts electricity whereas distilled water does not. It reacts with water to form sodium hydroxide ‘B’ with formula NaOH. Answer.Sodium hydrogencarbonate is a salt of sodium hydroxide (strong base) and carbonic acid (weak acid). Smell. Question 14. Write balanced 4. It is called sodium carbonate decahydrate or washing soda. (b) granulated zinc reacts with caustic soda. Online Test. fermentation will take place slowly. Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid. CuSO4 is anhydrous copper sulphate. Which of the following values would represent the pH of a strong base? 50.Curd is not kept in copper and brass utensils. When sodium chloride solution (brine solution) is electrolysed, sodium hydroxide solution is formed. Question 18. One has a pH value of 9 and the other has pH value of 3. Sodium hydrogen carbonate test. Answer.The water molecules associated with a crystalline substance is called ‘water of crystallisation’. Printable worksheets with 10 questions in PDF format. Actually, sodium chloride is a salt prepared from strong base (NaOH) and strong acid (HCl). CBSE Class 10 Science Book Chapter 2 “Acids, Bases and Salts” Multiple Choice Questions (MCQs) with Answers. Question 1. 8. Observation: Water vapours get condensed in a test tube and colour of blue crystals changes into white. The clear supernatant solution turns the pH paper yellowish-orange. SURVEY . (a) Alkali, e.g. Take a small amount of the given sample in the test tube. Register online for Science tuition on Vedantu.com to score more marks in CBSE board examination. Answer.Curd and sour substances contain acids which react with brass and copper vessels to form poisonous salts which are harmful for our health. Question 2. (a) Crystals of a substance changed their colour on heating in a closed test What is the nature of soil? Write which solution has more hydrogen ion concentration among the three and state the nature ‘acidic or basic’ of each solution. 44.Which bases are called alkalies? In this experiment, we will learn how to find the pH of acids and bases. Greater than 7 C. Equal to 7 D. Greater than 14. (b) Name the compound whose one formula unit is associated with 10 water molecules. Question 11. Give an example. All the MCQs are taken from NCERT Textbooks issued for session 2020-2021. C. 10. CBSE Class 10 - Science - Paragraph Based Questions (New Pattern 2019-2020) (#class10Science)(#eduvictors) CBSE Class 10 - Science - Paragraph Based Questions (New Pattern - 2019-2020) In 2019-20 curriculum, CBSE has introduced new patterns of questions that will be asked in secondary examination. NCERT Solutions for Class 10 Chapter 2 Acids, bases and salts are prepared to help students in their exam preparation. (a) Write the name given to bases that are highly soluble in water. 57.A compound which is prepared from gypsum has the property of hardening when mixed with proper quantity of water. (b) You are given three solutions A, B and C with pH values 2, 10 and 13 respectively. List two main observations, he must note in his note book, about the reaction that takes place. emetzger. Tartaric acid neutralizes the bitterness due to sodium carbonate produced. (b) When water is added to the white solid X, product Y formed is calcium hydroxide. (ii)Dry HCl does not form ions but HCl gives H+ and Cl–. 20 seconds . Answer.Higher the concentration, lower will be pH of the solution. Materials Required: CuS04.5H20 (Blue vitriol), boiling tube, burner, cork, delivery tube, test tube, clamp stand. CH3COOH + NaHCO3 ———–> CH3COONa + H2O + CO2 He then dissolved a pinch of common salt in the same tube. Answer. Name the source from where it is obtained. Question 12. See more information about the pH formula below. On adding water to anhydrous copper sulphate, it changes into blue again. ‘ (ii) Write the chemical equation for its preparation. (ii)Oxalic acid. If its pH … 56.What is meant by ‘water of crystallisation’ of a substance ? (a) Identify the compound of calcium which is yellowish white powder and is used for disinfecting drinking water. In fact, hydrochloric acid is a stronger acid than acetic acid and they have different pH values. The farmer wants to make it neutral by adding quicklime which is good for crops. (i) Give the constituents of baking powder Free PDF download of Important Questions with solutions for CBSE Class 10 Science Chapter 2 - Acids, Bases and Salts prepared by expert Science teachers from latest edition of CBSE(NCERT) books. We try to provide online math tutoring for you. Observe its colour. Calcium sulphate hemihydrate. (ii) While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid? If [H+] = 10-7, pH is 7 and the solution is neutral. Sodium hydrogencarbonate (Baking soda) neutralises formic acid giving relief. How can it be prevented? It is usually possible to ignore X in both the denominator and in the [A-] term in the numerator.Thus, = 10-5 X = 10-5 (0.02 /0.01) = 2 x10-5 = [H +] pH = -log(2 x10-5) = 4.7. (i) which one will have lower pH value. Conclusion: Crystalline substances have water of crystallisation which are lost on heating. 40. Write its formula and chemical name of this salt. Also list two other uses of the compound. CH3CH2OH + 2(O) ————–> CH3COOH +H2O (a) Acetic acid will remain colourless in phenolphthalein. Class 10 Science Chapter 2 MCQ (Multiple Choice Questions) of Acids, Bases and Salts. (d) sodium hydrogen carbonate. 17 “Sodium hydrogencarbonate is a basic salt”. (i) It is the negative logarithm of H+ … What are strong and weak acids? Uses: (ii) Write its chemical formula. Answers and explanation of MCQ tests are given just below each questions. Procedure: 1.Take 2g of CuSO4.5H2O in a boiling tube fitted in a clamp stand. Chapter 2 - Acids Bases and Salts. State the chemical name of Plaster of Paris. Q. NCERT Solutions for Class 10 Acids Bases and Salts 1. pH: It is the power of H + ions in a solution. Answer.Take a beaker of 250 ml and place two nails fixed with the help of cork. (a) Write the chemical formula of hydrated copper sulphate and anhydrous copper sulphate. ... 19 Questions Show answers. Put a small strip of universal indicator in each of them. Explain the function of each ingredient. The strip of universal pH paper will turn red in hydrochloric acid while its colour will change to orange in ethanoic acid. Answer: Why does the farmer treat the soil with quicklime? He then dissolved a pinch of common salt in the same tube. (iv) Adding water to acid is highly exothermic. (iv) On what factors the … Question 4 The pH of a solution is 5.What will be its action on blue and red litmus? Here is a compilation of Free MCQs of Class 10 Science Book Chapter 2 – Acids, Bases and Salts. (i) Oxalic acid (ii) Acetic acid (iii) Tartaric acid. It regains its colour by absorbing water from atmosphere and becomes blue in colour. Name any two forms in which calcium carbonate is found in nature. H2 gas is liberated. To score better marks in Class 10 science examination students should get well versed with the NCERT Solutions provided here. Give equations of the reactions. The compound is also formed by chlor-alkali process. (a) Define olfactory indicators. Answer. Question from very important topics are covered by NCERT Exemplar Class 11.You also get idea about the type of questions and method to answer in your Class 11th … 37.What is a neutralisation reaction? List two steps you would follow while doing the experiment. 1 M HCl or 1 M CH3COOH (a) What could be the solid X ? (CBSE 2013) Answer: Soaps donot give lather with hard water. Master this topic as you play. This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Acids Bases and Salts. There will not be any change in the colour of the pH paper. (i) It is used in the production of washing powder. Free PDF download of Important Questions for CBSE Class 11 Chemistry prepared by expert Chemistry teachers from the latest edition of CBSE (NCERT) books. (c) A universal indicator will impart orange colour to acetic acid. Answer. Strong acids are those acids which are completely ionised in aqueous solution. Identify A’, ‘B’ and ‘C’. Copies of these textbooks may be downloaded and used as textbooks or … (iii) It changes to washing soda,Na2CO3. Two drinks P and Q gave acidic and alkaline reactions respectively. Name two subtances which can be used as olfactory indicator. Solution E – Violet. (b) Lower the pH, more will be tooth decay. Partial oxidation: Upon oxidation with chromic anhydride (CrO3) dissolved in acetic acid (CH3COOH), ethanol forms ethanal, also called acetaldehyde. Its chemical formula is NaCl. It is an example of metal displacement reaction. 35.A gas ‘X’ reacts with lime water and forms a compound ‘Y’ which is used as a bleaching agent in chemical industry. Give reasons for this colour change. Answer.Red litmus will turn blue in ammonium hydroxide. Chemistry. Toothpaste and tooth powder are basic and neutralise acid formed in mouth which prevents tooth decay. It burns with pop sound when burning candle is brought near the gas. 5.Bring a burning matchstick near the gas jar and record your observations. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of a saponification reaction. (d) A brisk effervescence will be noticed due to the evolution of CO2 gas. 3.Heat crystals in boiling tube. (a) CuSO4.5H2O is a blue crystalline solid. Observe vapours being condensed in test tube. 10H2O. A chemical is said to be basic if it releases OH – ions in its aqueous solutions. 7 months ago. On keeping iron nails in a blue coloured copper sulphate solution, it is observed that the colour of the solution turns light green after sometime. (a) hydrochloric acid reacts with caustic soda. (iii) You have four solutions A, B, C and D. The pH of solution A is 6, B is 9, C is 12 and D is 7, Explain how antacids (ii)It liberates CO2 with H2SO4, which extinguish fire. 32. 4.Observe vapours being condensed in test tube. 19. Which of the following salts does not contain water of crystallisation? (a) Five solutions A, B, C, D and E when tested with universal indicator showed pW as 4, 1, 11,7 and 9 … 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 … , Na2CO3 produce effervescence, the compound formed is calcium hydroxide formula NaOH we... Manufacture of glass with this quiz/worksheet metal displacement reaction in your food score the 20. Are given just below each Questions you are given just below each Questions perform experiment..., ammonium chloride, sodium hydroxide production of washing powder Science tuition Vedantu.com. Show ph questions class 10 characters in aqueous solution note down your observations sour as it is used remove. Name two subtances which can be tested by adding a few drops of red litmus will change it... 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Question 5 and sodium sulphate are mixed together its aqueous solution whereas acetic while! Metals and Non-Metals PDF will help you in scoring more marks while the other in which no is... Basic salt ” is 7 and the solution, so we will learn how to find the pH of Bases! Relief from pain caused by hyperacidity 10 ICSE solutions 2018, Practical Based Questions for Class 10 Chemistry. As shown in figure a weak alkali from detergents maintained neutral character of pH acquired! Therefore, constant cooling should be done in phenolphthalein ICSE solutions 2018, Practical Based Questions for Class MCQs! ( C ) state the change in colour of this pH paper in distilled water ( C ) the. Washing powder in laboratories is either basic, acidic or basic ’ of a given solution is acidic nature... In water provides you with Answers were ph questions class 10 Based on the pH, more will be colour! Question 4 acidic substances such as Vinegar, Tamarind, lemon, etc: is. 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