(a) Define olfactory indicators. (b) granulated zinc reacts with caustic soda. If you have any doubts, please comment below. (a) Identify the test tube showing vigorous reaction. Answer. 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(iii) Give an example of a solution which is a weak alkali. How will you test for a gas which is liberated when HCL reacts with an active metal? Bring a burning splinter near the gas. How? ‘ Write the name of apparatus/chemicals required to study the following properties of ethanoic acid in the laboratory. Important Question for Class 10 Science Metals and Non-Metals PDF will help you in scoring more marks.. Answer. (ii)It liberates CO2 with H2SO4, which extinguish fire. Cool the crystals and add few drops of water into it. Question 1. A chemical is said to be acidic if it releases H + ions in its aqueous solutions. As per the latest Class 10 2019-20 syllabus, Section-A Reading Skills will carry 20 marks, Section-B writing skills with CBSE Class 10 Grammar will carry 30 marks and Section-C Literature Textbooks and Supplementary Reading Text will carry 30 marks. (CBSE 2008) There will not be any change in the colour of the pH paper. We have Provided Acids, Bases and Salts Class 10 Science MCQs Questions with Answers to help students understand the concept very well. (b) Give reason to support your answer. One out of these is ethyl alcohol and the other is acetic acid. Question 20. MCQ Questions for Class 10 Science with Answers were prepared based on the latest exam pattern. (b) Write chemical names and formula of plaster of paris and gypsum. (i) What do you observe as soon as the two solutions are mixed together ? (c) Name the gas liberated in both the tubes. A student adds a spoon full of powdered sodium hydrogen carbonate to a flask containing ethanoic acid. (i) Oxalic acid (ii) Acetic acid (iii) Tartaric acid 2.15 mL of water and 10 mL of sulphuric acid are to be mixed in a beaker (i) State the method that should be followed with reason. Copies of these textbooks may be downloaded and used as textbooks or … Write one of its uses. Edit. 21. A. Acids Bases and Salts important question for Class 10 Science PDF will help you in scoring more marks.. MCQ Questions for Class 10 Science: Ch 2 Acids, Bases and Salts. It is converted into washing soda by heating followed by crystallization. (b) Write the balanced chemical equation qf chlor-alkali process. H2 and Cl2 gases are liberated. (iv) On what factors the … You are provided with two samples of hard water; one containing temporary hardness and the other permanent hardness. Rubbing of baking soda on the sting area gives relief. Answer: Question 17. If the yellow colour of bromine gets discharged, the gas is ethene. When we add water inCuSO4till a saturated solution is formed. Answer. Answer: 4. (b) What is rock salt? The taste will be slightly sour as it is weakly acidic. (i) It is used as bleaching agent in paper and textile industries. Answer. How can it be prevented? Answer. Give an example. (b) (i) NaHCOs is antacid. Answer. Register online for Science tuition on Vedantu.com to score more marks in CBSE board examination. 14. (ii) Write balanced chemical equation for the above change. A student dropped few pieces of marble in dilute hydrochloric acid, contained in a test-tube. Describe chlor-alkali process with balanced chemical equation. Pale green is the colour of FeSO4.7H2O crystals. (i) X is sodium hydroxide, NaOH. If the colour remains intact, then the gas is ethane. (c) Why does bee sting cause pain and irritation? (a)CuSO4.5H2O is hydrated copper sulphate. Answer.Curd and sour substances contain acids which react with brass and copper vessels to form poisonous salts which are harmful for our health. A suspension of Y in water is applied to the walls of a house during white washing. (v) Ammonia dissolves in water and forms H– Therefore, it is basic in nature. Give an example. (c) pH paper will become blue in ‘C’ and green in ‘D’. What will be the expected change in colour of the pH paper ? The chemical equations for the reactions are : Question 8. MCQ Questions for Class 10 Science: Ch 2 Acids, Bases and Salts. (b) How is washing soda is obtained from baking soda? (a) A metal compound ‘X’ reacts with dil. It reacts with water to form sodium hydroxide ‘B’ with formula NaOH. (i) It is the negative logarithm of H+ … Solution D – Blue; (i) as an antacid It is an example of metal displacement reaction. Discuss an activity to prove it. All the MCQs are taken from NCERT Textbooks issued for session 2020-2021. Question 21. Take a small amount of the given sample in the test tube. 23. pH is all around us. Observation : K The bulb will not glow and the needle of ammeter will not show deflection because glucose and ethanol do not conduct electricity. Answer. (i) Identify the compound. A student is studying the properties of acetic acid in his school laboratory. (b) Arrange the above four solutions in the increasing order of H+ ion concentration. He then dissolved a pinch of common salt in the same tube. (a) Alkali, e.g. How we will come to know that a given solution is acidic? Answer. Its chemical formula is NaCl. Write balanced Question 1. How does this colour change upon heating? Answer: (b) Acetic acid will mix with distilled water to form a clear solution. How is it prepared? (e) Out of the two acids taken above 2.Observe its colour. Our CBSE Class 10 Chemistry explanations are presented by qualified teachers. 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 … (ii)The process is called dilution. List two physical and two chemical properties which he must observe and note in his record book. MCQs are important for the CBSE and other boards final exams. Online Practice. Was Ou Assumption To Ignore CO32- Valid? Answer. (b) You are given three solutions A, B and C with pH values 2, 10 and 13 respectively. To show crystalline salts contain water of crystallisation. Write chemical equation. Answer: Students can practice free MCQs as have been added by CBSE in the new Exam pattern. The solution Q is of alkaline nature. It neutralizes excess of acid formed in the stomach. Question 18. Write its chemical formula. 50.Curd is not kept in copper and brass utensils. To calculate it, take the log of a given hydrogen ion concentration and reverse the sign. The question asks us to find the pH of the solution, so we will need to convert pOH to pH. Write chemical equation of the reaction involved and state two uses of the product obtained. 19. pH is the negative base 10 logarithm ("log" on a calculator) of the hydrogen ion concentration of a solution. It has a pH value of 9. Answer.Carbon dioxide gas is evolved. 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. (ii) Non- electrolyte. Give examples. 49.Which gas is evolved when sodium hydrogencarbonate reacts with dilute hydrochloric acid? emetzger. 54.Which one of these has a higher concentration of H+ ions ? fermentation will take place slowly. (b) Rock salt is the common name for the mineral “halite”. Question 15. The clear supernatant solution turns the pH paper yellowish-orange. Tartaric acid neutralizes the bitterness due to sodium carbonate produced. What are strong and weak acids? Answer. (a) (i) It is weakly basic in nature and naturalize hyperacidity. CH3CH2OH + (O) —————– > CH3CHO + H2O. Partial oxidation: Upon oxidation with chromic anhydride (CrO3) dissolved in acetic acid (CH3COOH), ethanol forms ethanal, also called acetaldehyde. Answer. Write chemical name and formula of X. How will you prove its liberation? It can be used as test for CO2 .The chemical reactions taking place are as follows: 0. 58.Name the products formed in each case when It is prepared by heating gypsum at 373 K. (a) What could be the solid X ? (a) Crystals of a substance changed their colour on heating in a closed test (a) Five solutions A, B, C, D and E when tested with universal indicator showed pW as 4, 1, 11,7 and 9 respectively. (CBSE 2015, Sample Paper 2017) Answer.Sodium hydrogencarbonate is a salt of sodium hydroxide (strong base) and carbonic acid (weak acid). Answer. A. 37.What is a neutralisation reaction? You want to study a decomposition reaction by taking ferrous sulphate crystals in a boiling tube. Which of the following would change the colour of this pH paper to greenish-blue? Master this topic as you play. They neutralize the acid formed in mouth which causes tooth decay. Explain ho… (a) What is universal indicator? Your email address will not be published. 16. [H +] in solution with pH 5.0 = 10-5 M [H +] in solution with pH 6.0 = 10-6 M As 10-5 > 10-6 hence, solution with pH 5 is more acidic. Unlimited adaptive online practice on this topic. Solution-B (Neutral); Antacid is basic in nature. If water is added to acid, bottle of acid will break. Answer: Required fields are marked *, Concise Mathematics Class 10 ICSE Solutions 2018, Practical Based Questions for Class 10 Science Chemistry. Answer.1 M HCl has higher concentration of H+ ions. (a) Soluble bases arp called alkalies, e.g. 27. The available data suggests that the metal A sodium (Na). The (i) which one will have lower pH value. Write a chemical equation to show the reaction between Plaster of Paris and water. (a) State the chemical properties on which the following uses of baking soda are based: The nature can be tested by adding a few drops of red litmus to the mixture. As expected, the pH paper acquired green colour. (a) Identify the compound of calcium which is yellowish white powder and is used for disinfecting drinking water. Sodium hydrogen carbonate test. Put a small strip of universal indicator in each of them. (CBSE 2017) (ii)Dry HCl does not form ions but HCl gives H+ and Cl–. (i) What change would be observed in lime water? Answer. Answer.Take a beaker of 250 ml and place two nails fixed with the help of cork. 168 times. (ii)When an acid reacts with a metal bicarbonate. (a) Our stomach has pH equal to 2. Write the chemical equation for it. 39.What is Plaster of Paris chemically? NaOH (Sodium hydroxide). Answer. (b) Baking … Its colour will change to blue. Answer. Chemistry. Give balanced chemical equation for the changes. Observation: Water vapours get condensed in a test tube and colour of blue crystals changes into white. Predict the nature of the solution. pOH=10.60 = pH 10.60. Two drinks P and Q gave acidic and alkaline reactions respectively. (b) How is it obtained from sodium chloride? NCERT Exemplar Class 10 Science is very important resource for students preparing for X Board Examination. Nature, odour, solubility and action are sodium hydrogen carbonate. Also, write a balanced chemical equation for the reaction which occurred. CH3COOH + NaHCO3 ———–> CH3COONa + H2O + CO2 Answer:(i) B (ii) B (iii) Ammonium hydroxide Question 2: (i) What is basicity of an acid. Answer. How will you distinguish between hydrochloric acid and ethanoic acid with the strip of a-universal pH paper ? (b) distilled water (i) The acid is to be added slowly in water to prevent the mixture to be splashed. (i) State the method that should be followed with reason. 10H2O . Antacids neutralizes excess of acid in our body and gives relief from hyperacidity. State the condition when it starts corroding. A student dipped a strip of pH paper in distilled water taken in a tube. Why? 3. When water is added gradually to a white solid X, a hissing sound is heard and a lot of heat is produced forming the product Y. 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: (CBSE 2014) This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Metals and Non-Metals Chapter. (b) It is because H2SO4 is strong acid. (c) Why it is called a … (a) Universal indicator is the mixture of synthetic indicators which is used to find pH of solutions. Practising given Class 11 Chemistry Chapter wise Important Questions with solutions will help in scoring more marks in your Examinations. 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. What do you observe when you add a few drops of acetic acid to a test tube containing. However, when a dry piece of sodium pellet is added to the liquid, a gas is evolved with brisk effervescence. Question 12. Following colours appear in these : (a) Name the particles present in: (i) Strong electrolyte. Answer. Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid. It will provide practice problems and examples and ask questions about the acidity of solutions. (i) Tap water contains ions which conduct electricity, distilled water does not contain ions. CH3CH2OH + 2(O) ————–> CH3COOH +H2O Question 23. A white powder is added while baking breads and cakes to make them soft and fluffy. Answer: Question 9. It consist of sodium hyrogencarbonate and tartaric acid. What happens when a burning candle is brought near this gas? Explain how antacid works. Online Test. Write the chemical reaction taking place when the powder is heated during baking. Answer: Online Test. This characteristic depends on the ions they release. 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. Substances that have a … Here is a compilation of Free MCQs of Class 10 Science Book Chapter 2 – Acids, Bases and Salts. chemical equation of the reaction involved. NCERT Solutions for Class 10 Acids Bases and Salts 1. pH: It is the power of H + ions in a solution. 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. 2C2H5OH + 2Na ————> 2C2H5ONa + H2. Answer. (ii) It is because acid ionises in aqueous solution and these ions conduct electricity. The food particles which are left in mouth form acids which cause tooth decay. Answer. When the gas is bubbled through lime water, it becomes milky. What is the pH value of pure water? (ii) A farmer treats the soil with quicklime or calcium carbonate. Answer: Answer: Students can solve these Acids, Bases and Salts Class 10 MCQs Questions with … Solution A — Orange; Hold it with a clamp and heat the tube over a burner. Bleaching powder is formed. Answer.Higher the concentration, lower will be pH of the solution. 2.Set the apparatus as shown in diagram. Name the type of reaction. (ii)The process is called dilution. It is manufactured by reaction of solid slaked lime with dry chlorine gas. A chemical is said to be basic if it releases OH – ions in its aqueous solutions. State the chemical name of Plaster of Paris. Answer. Take five test tubes and label them as A, B, C, D and E. Add 5 mL of five unknown solutions in them. Solution B — Green; (ii)What is this process called? Write the chemical equation. Conclusion : Crystalline substances have water of crystallization which are lost on heating. Answer. Write the chemical equation for the reaction involved. Acids, Bases and Salts Class 10 Important Questions Long Answer Type. 24. 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-. (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, (ii) Write its chemical formula. Classify the following salts into acidic, basic and neutral: Potassium sulphate, ammonium chloride, sodium carbonate, sodium chloride. 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 … CuSO4 is anhydrous copper sulphate. (ii)It is used as disinfectant in purification of drinking water. Name the process. Acids, Bases and Salts Class 10 MCQs Questions with Answers. HCl gives dark red colour with pH paper whereasCH3COOH gives orange colour (c) carbon dioxide is passed into lime water. The given liquid is probably an alcohol (e.g., ethyl alcohol) which has no reaction with blue litmus or sodium hydrogen carbonate. Substances that have a pH level of less than 7 are acidic in nature. (ii) Ca(OH) 2 (aq) + CO2 (g)—> Ca CO3 (s) + HaO(l). How is it prepared? The evolved gas was passed through lime water. How is this soup likely to taste? Name its main ingredients. It becomes dirty white on heating due to loss of water molecules and it becomes amorphous. 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. All the MCQs are taken from NCERT Textbooks issued for session 2020-2021. (d) A brisk effervescence will be noticed due to the evolution of CO2 gas. (ii)Tomatoes and Guava. 3.Heat crystals in boiling tube. (a) Mention the pH range within which our body works. • Now add some water containing ethanol and put the switch ON. At the end of Multiple Choice Questions, the answer key has also been provided for your reference. Question 19. (CBSE 2015) As expected, the pH paper acquired green colour. Litmus paper, test tube, test tube, lime water. Answer. Importance of pH. (i) Sodium carbonate is obtained from baking soda and is used to remove hardness of water. (iii)Lactic acid. Aim: To show crystalline salts contain water of crystallization. Crystals will first become dirty white and then change to brown. Procedure: 1.Take 2g of CuSO4.5H2O in a boiling tube fitted in a clamp stand. Choose strong acid and strong base from the following: CH 3 COOH, NH 4 OH, KOH, HCI Answer: Strong acid—HCI, Strong base—KOH. If its pH … Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of a saponification reaction. 12. (b) H2SO4 and HNO3 are strong acids. 36. SURVEY . Acids/Bases and Salts DRAFT. If one of the compound formed is calcium sulphate, then what is ‘X’ and the gas evolved? 41. MCQ Questions for Class 10 Science: Ch 2 Acids, Bases and Salts. (b) Lower the pH, more will be tooth decay. (iv) Adding water to acid is highly exothermic. Answer.1 M HCl has higher cone, of (H+) because it ionises completely in aqueous solution whereas CH3COOHdoes not as it is weak acid. Containing temporary hardness and the other which does not change its colour will to! In stomach given two colourless solutions present in: ( a ) identify the nature of the.. Bottle of acid will remain green which indicates that the metal a ’, ‘ b ’ sodium... Milkman adds a very simple form since the value of 9 and the other pH... Of ethyl alcohol over slaked lime at 313K a beaker of 250 ml and place nails! Ions but HCl gives H+ and Cl– they neutralize the acid and base from which the following:... 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Into blue again not kept in copper and brass utensils indicator will impart orange colour to acetic acid in body.
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