Write one industrial use of each.  (2015) (i) The acid is to be added slowly in water to prevent the mixture to be splashed. Acids, Bases, and Salts is the second chapter of Class 10 Science. H 2 SO 4 + Zn → ZnSO 4 + H 2 Acids + Metal Carbonate/Metal hydrogen Carbonate = Salt + CO 2 e.g NaHCO 3 + HCl → NaCl + H 2 O + CO 2 Acids + Bases → Salt + water 2NaCl (aq) + 2H2O (l) → 2NaOH (aq) + Cl2(g) + H2 (g) [CDATA[ Base:  from orange to yellow HCl produces more H+ ions and is said to be a strong acid while acetic acid gives less H+ ions, therefore said to be a weak acid. 23. The dehydration of copper sulphate crystals is a reversible process. Answer: (b) dilute hydrochloric acid reacts with magnesium ribbon. Q7. Washing soda is used in the glass, soap and paper industries. An acid is a substance that renders ionizable hydronium ion (H3O+) in its aqueous solution. Use: Plaster of Paris is used in hospitals for setting fractured bones in the right position to ensure correct healing. Aqueous solution of sodium sulphate gets hydrolysed to form sodium hydroxide and sulphuric acid which are strong base and strong acid respectively. 5.What is the minimum & maximum value of PH meter? What change would be observed in lime water? Uses of washing soda : Formula: NaHCO3 Answer: They turn blue litmus red. Example : HCL+Ca(OH)2→CaCL2+H2O, Basic Salt i.e. Ans. NCERT Extra Questions for Class 10 Science Chapter 2 Acids, Bases and Salts with Answers will help to score more marks in your CBSE Board Exams. 27.When acid/base is mixed with water, concentration of H+/oH- decreases or increases? Question 5. The chemical name of baking soda is sodium bicarbonate (NaHCO3) or sodium hydrogen carbonate. 35. (d) 4 A : Neutralization reaction : a reaction in which two compounds react to form neutral substance . It is Formed When Weak Or Strong Acid And Base React With Each other. acid + base→salt + water (a) 4 mL HCl H + + Cl-. Bases are those substances which when dissolved in water gives OH- ions. Solution with pH=8,9,10 are weak base. Earlier, it was thought that those substances that are sour, turn blue litmus red  and are corrosive are called acids. When same concentration of HCl and acetic acid are taken then these two produce different amounts of hydrogen ions. (c) 1 2.Reaction with Metals: They react with acid to form metal salt and hydrogen gas if(k.className == "adPushupAds" && k.getAttribute("data-push") != "1") { How do we come to know that milk has turned sour? window.__mirage2 = {petok:"2bb90bd34a9c3841e634d59cdc7e5191b402531b-1608327502-1800"}; (ii) Which solution has more H+ ion concentration? State the number of water molecules present in crystals of washing soda and plaster of paris. Acids, Bases and Salts class 10 2). Why does distilled water not conduct electricity, whereas rain water does? Ans. There actually, A: Acids not show acidic behaviour in the absence of water because in absence of water they do not get ionized to produce hydrogen ions, Chapter 1 Chemical Reactions and Equations Class 10, Chapter 2 Acids, Bases and Salts Class 10 Science Chapter, Chapter 3 Metals and non metals Class 10 Science Chapter, Chapter 4 Carbon and its Compounds Class 10 Science Chapter, Chapter 5 Periodic Classification of Elements Class 10 Science Chapter, Chapter 6 Life Processes Class 10 Science Chapter, Chapter 7 Control and Coordination Class 10 Science Chapter, Chapter 8 Reproduction Class 10 Science Chapter, Chapter 9 Heredity and Evolution Class 10 Science Chapter, Chapter 10 Light - Reflection and Refraction Class 10 Science Chapter, Chapter 11 The Human Eye and the Colourful World Class 10 Science Chapter, Chapter 12 Electricity Class 10 Science Chapter, Chapter 13 Magnetic Effects of Electric Current Class 10 Science Chapter, Chapter 14 Sources of Energy Class 10 Science Chapter, Chapter 15 Our Environment Class 10 Science Chapter, Chapter 16 Sustainable Management of Natural Resources Class 10 Science, CBSE Class 10 Science Syllabus 2019-2020 Session, Tips to score 95% in class 10 Science paper, Learn English Grammar in Hindi ( step by step) - Learn English Online Videos, English Writing Skills - Class 10, 12 Letter Formats, Email etc, Entrance Exams for Arts students after Graduation, List of Entrance Exams conducted by IGNOU, There actually exists the equilibrium between dissociated ions and undissociated, Effect Of Acid On Vanilla Extract: same smell, Effect Of Base On Vanilla Extract:smell changes, Effect Of Acid On Onion Extract:same smell, Effect Of Base On Onion Extract: smell changes, Used in detergents as it has cleansing properties, Reaction with water : when used it has to mixed with water and following reaction occurs-. It is used in the manufacture of borax compound. With examples.  (2014) (ii)The process is called dilution. Fresh milk has a pH of 6. We feel the sting due to the secretion of methanoic acid from it. 1. The higher the pH, the more alkaline the solution is. So, it prevents the reaction from becoming violent. Ans. Question 2. Ans. Q14. Acid turns blue litmus paper red. Curry contains turmeric which acts as an acid-base indicator. Acid + base →salt and water First, take three strips of blue litmus paper and dip one in each test tube.   Na2CO3.10H2O  → Na2CO3+10H2O                                            (b) HCl (b) Solution A gives pink colour when a drop of phenolphthalein indicator is added, therefore A is a base. It turns blue litmus paper red. Write the chemical name of Plaster of Paris. (b) How are sodium hydroxide and Cl2 (Chlorine) gas produced from common salt. 25. CBSE Maths notes, CBSE physics notes, CBSE chemistry notes. It is used for making soaps and detergents. Ans. Ans.A) it can remove acidity of oil (a) Study the following chemical equation: (a) The blue colour of crystals of a substance changed on heating in a closed test tube but the colour was regained after sometime on cooling. Why do acids not show acidic behaviour in the absence of water? Example, Na. Name the substance and write its chemical formula. This document is highly rated by Class 12 students and has been viewed 22615 times. uses of Baking Soda Describe an Activity to prove it. (b) Analgesic 3) Basic solution. Ans.Slaked lime i.e. (a) Antibiotic Why should Plaster of Paris be stored in a dry place?  (2017 D) Stomach acts in slightly acidic medium while small intestine digests the food in slightly alkaline medium. (a) Identify the compound of calcium which is yellowish white powder and is used for disinfecting drinking water. Chemicals from common salt; NCERT Solutions for Class 10 Chapter 2 Science Acids bases and salts. (i) A is acidic solution whereas B is basic solution. Bring a burning candle near hydrogen gas-filled bubble. 1/4 H2O. Question 8. follows-. Lime water in each case will turn milky due to the production of CO2 gas in each of the test tubes. Ans.Sulphuric acid is called acid because when dissolved in water, it dissociates to give H3O+ ions. (d) 16 mL, Q4. This can be prevented by cleaning the mouth and teeth using toothpaste which are generally basic and can neutralize the excess acid. You are provided with three test tubes C, A and B which contain distilled water, acidic solution and basic solution. Indicators: Are the substances that bring about change in themselves when some acid or base is added to Natural and artificial indicators So when water is added to anhydrous copper sulphate, it gets hydrated and turns blue due to the formation of hydrated copper sulphate. Ans. At That Ph Acid Reacts With Calcium Phosphate Of Tooth Enamel And Cause Its Corrosion. Learn Insta try to provide online science tutoring for you. (a) You are given two solutions A and B. A :Alcohols and glucose when added to litmus show no effect because they do not get ionized when added to water. Ph and its biological importance, indicators. Ans. 3. (b) Write name and chemical formula of two such compounds whose one formula unit is associated with 10 and 2 water molecules respectively.  (2015) If we talk about strength, it means the amount of hydrogen ions given out when acid is dissolved in water. (b) Solution A gives pink colour when a drop of phenolphthalein indicator is added to it. How do you think the pH will change as it turns into curd? (a) Universal indicator is a mixture of many different indicators which gives different colours at different pH values of the entire pH scale. A :Plaster of Paris should be stored in a moisture-proof container because if it comes in contact with air, it is transformed into  hard substance called gypsum. *NAME- PIYUSH BHANDARI *CLASS- ‘10’th *SECTION- ‘A’* *SUBJECT- SCIENCE P.P.T *SUBMITTED TO- RAHUL GAUR 2. Strength of acid and base is expressed in terms of Ph. Illustrate any three chemical properties of acids. 16.Out of phosphoric & carbonic acid which is weak acid? (b) Why does this milk take a long time to set as curd? What is a neutralisation reaction? Effect of Acid: Turns blue litmus red More basic a solution is more will be its pH. If we take 20 mL of the same solution of NaOH, the amount HCl solution (the same solution as before) required to neutralise it will be MCQs from CBSE Class 10 Science Chapter 2: Acids, Bases and Salts 1. Some fruits like mango, lemon, raw grapes, orange, etc., have a sour taste due to the presence of: Question 7. Also check CBSE Class 10 … 0-2:                            Strong Acid dioxide gas is released. Formation of CaCO3 white ppt makes the lime water milky. (i) Identify the acidic and basic solution. The ph of any substance can be detected by using ph paper or ph scale. 1. Solution B: pH = 8 The unit includes seven learning activities aimed at lower second level students, aged 12-15 years. Latest Entrance Exams, Admission info. Action of heat : i.e. When soap is scrubbed on a stain of curry on a white cloth, why does it become reddish-brown, and turns yellow again when the cloth is washed with plenty of water?  (2015 ) When baking powder mixes with water (present in dough made for baking cake or bread), then sodium hydrogen carbonate reacts with tartaric acid to evolve CO2 gas. Question 3. Why does dry HCl gas not change the colour of the dry litmus paper? Question 6. Basicity is defined as “Number of ions produced when acid is dissolved in water”. Example we have are : nitric acid, sulphuric acid, etc. Answer: NCERT CBSE Notes For Class 10 Science Chemistry Chapter 2 Acids, Bases and Salts Download in pdf Properties of Acids: – Produce hydrogen ions [H +] in H 2 O. – Sour taste. Question 3. B) it helps astronauts in reducing hamful levels of Co2. (a) When a piece of marble (CaCO3) is dropped in dil HCl, CO2 gas will be evolved which turns lime water milky. In the crucial hour of Class 10 Board exams, Acids, Bases and Salts Class 10 Notes aims at increasing the self-confidence of the students by offering a simple way to study or revise the chapter. NaHCO3 on heating produces Na2CO3 (Sodium carbonate, called soda ash) which on recrystallization produces washing soda. Reaction of acids with metal Oxides - Metal oxide is a chemical compound that contains oxygen and one metal in its chemical formula. (d) dilute hydrochloric acid reacts with iron filings. Examples: - Hydrochloric acid (HCl), sulphuric acid (H 2 SO 4) , nitric acid (HNO 3), carbonic acid ( H 2 CO 3 ). (a) Write the chemical name and chemical formula of washing soda. Organic Acids are obtained from plants and animals  or we can say they are present in organic matter. Write the significance of 10H2O. (b) When electricity is passed through an aqueous solution of sodium chloride (called brine), it decomposes to form sodium hydroxide. They turn red litmus blue. A reaction of an acid and base to form salt & water is called a neutralization reaction. (c) Washing soda is a basic salt because it is a salt of a strong base (NaOH) and weak acid (H2CO3) with pH value more than 7. (d) 10, Q2. Formula : CaoCL2 Ans.Minimum value of Ph meter is 0 and Maximum value is 14. a substance which on dissolving in water gives OH ion. These dissociate in their aqueous solution to form their constituent ions, as given by the following examples. Solution with pH=11,12,13,14 are strong base. Ans . ? When copper sulphate crystals are heated strongly, they lose all the water of crystallisation and form anhydrous copper sulphate (which is white): Thus, on strong heating, blue copper sulphate crystals turn white due to the loss of water of crystallisation. Solution with pH=4,5,6 are weak acids. As the acid is strong, therefore, strong character is retained in the salt that is why it comes out to be acidic (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. If you are given blue litmus paper only, how will you identify the contents of each test tube?  (2015) 3. 20.Out of KOH, Ba(OH)2 , Ca(OH)2, NaOH, pick weak oxide? Hydrogen gas is evolved which forms bubbles in the soap solution. 1. Ans. Name the reactant and the product and mention one use of the product. Explain the phenomenon involved. Like Onion Extract And Vanilla Extract, Class 10 Science Chapters, Explanation, Notes, Formula : : Na2CO3.10c However, when HCl gas dissolves in water, it forms hydrogen ions and hence shows acidic behaviour. A: Acids not show acidic behaviour in the absence of water because in absence of water they do not get ionized to produce hydrogen ions An acid is a substance which gives hydrogen ions or proton (H+) when dissolved in an aqueous solution. ?The solvay?s process is an efficient process because the bi products can be reused in this process : State reason for the following:  (2014) The dry HCl does not change the colour of dry litmus paper as it needs moisture or water for its acidic action. Bacteria present in the mouth produce acids by the degradation of sugar and food particles remaining in the mouth after eating. Effect on phenolphthalein-, original color is colorless They are bitter. } 2-4:                            Moderately Acidic More Than 4:          Weak Acid Reaction involved : 2. Question 5. Write the chemical equation for the reaction involved. Students can solve NCERT Class 10 Science Acids Bases and Salts Multiple Choice Questions with Answers to know their preparation level. (a) Water soluble bases are called alkalis, e.g., NaOH, KOH. Here we have given … These notes provide the students with the summary of the chapter, important points to remember and detailed explanation of important concepts and derivations for better understanding. b) Acid reacts with base to give salt … How one can be relieved from the sting of beetle? Question 3. (i) dry HCl gas does not change the colour of the dry blue litmus paper. In Dairies: Ph Value Of Milk Is Adjusted About 6.6. How? Which solution is HCL+NaOH→NaCl+H2O These bases  totally dissociates and leave no dissociated molecule of base, Example: Hydroxides of all reactive metals. In this chapter, students get hold of basic knowledge on Acids bases and salts. NH₃ + H₂O +NaCl + CO₂ → NaHCO₃ + NH₄Cl According to him, acids are the substances which when dissolved in water give H3O+ ions. 26.How sting of yellow weeps can be neutralized? Back to Lesson Acid vs Base: Acid Base Contains H+ /H3O+ ions in aqueous solution Contains OH- ions in aqueous solution Turns blue litmus paper LearnFatafat CBSE class 10 science course offers acids bases and salts class 10 notes for chapter 2. Q8. Lower the pH stronger will be the acid. When sodium carbonate is dissolved in water, it gets hydrolysed to some extent and forms sodium hydroxide and carbonic acid. Name the plant & its division for which litmus can be extracted? Ans. Cl2 gas is given off at the anode and H2 gas at the cathode while sodium hydroxide solution is formed near the cathode. That is, a solution having low concentration of hydrogen ions has a higher pH value. Action with metal carbonate and metal bicarbonate. (d) KCl, Q3. i.e., ACID +BASE →SALT +WATER 17.What is the value of ‘x’ for sling acids? Give two important uses of washing soda and baking soda. Question 2. Question 1. Pass the gas produced in each case through lime water as shown in the figure. A :Distilled water not conduct electricity, whereas rain water does because distilled water is pure form of water so it does not ionize whereas rain  water contains impurities that makes it good conductor of electricity. If Ph Falls Below 6.6 It Turns Sour. This ammonia and water can be reused in solvay’s process . Hope given HOTS Questions for Class 10 Science Chapter 2 Acids, Bases and Salts are helpful to complete your science homework. Complete  NH4Cl + NaOH → NaCl + _____ + H2O. Chemical name :Calcium Oxychloride 33.Which gas is liberated when acids react with metal carbonates? For Measuring, We Have Ph Scale Given By: Observations Made On The Bases Of Ph Values, Ph Range Indicate the strength of acids and bases as given below : (b) 8 mL A milkman adds a very small amount of baking soda to fresh milk. Write an activity to show the reaction of acids with metal carbonates and metal hydrogen carbonate salts.  (2017D) It is used for removing permanent hardness of water. Question 6. The substance is Copper sulphate crystals (CuSO4.5H2O) which are blue in colour. (b) Why is HCl a stronger acid than acetic acid? (f) Arrange the pH in increasing order of hydrogen-ion concentration. Name the gas which is usually produced when dil. 38. Turmeric contains a yellow dye, which turns red in basic solutions when soap is scrubbed on a stain of curry on a white cloth. Now put the blue litmus paper which is turned red by the acid of test tube A in the remaining two test tubes. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. In this page, we are providing Acids, Bases and Salts Class 10 Extra Questions and Answers Science Chapter 2 pdf download. 2Al +3H2SO4-->Al2(SO4)3+ H2 3. Answer: (iii) Tooth decay starts when the pH of the mouth is lower than 5.5. Effect of ph on dilution: (ii)What is this process called? 2Fe+6HCl-->2FeCL3+3H2. – React with several metals releasing Hydrogen gas. (a) (i) Living organisms can survive only in a narrow range of pH change. How will you test the evolution of this gas?  (2015) continuous stirring. It is used for cleaning water tanks ,toilets, etc. Solution B gives red colour when a drop of methyl orange is added to it, therefore B is an acid. Distilled water, sugar solution and most salt solutions are neutral (pH 7). (a) Solution A: pH = 6 (2013) If the liquid of test tube B turns that red litmus paper to blue again, it shows that it is a base. What is the effect of acid on litmus, Phenolphthalein? (a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline? (f) 11<9<7<4<1. 6.6, it turns sour. (b) How is tooth decay related to pH? 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Acids react with bases to form salt and water (neutralization reaction).