{"id":6886,"date":"2023-12-22T05:41:08","date_gmt":"2023-12-22T05:41:08","guid":{"rendered":"https:\/\/theexampillar.com\/ncert\/?p=6886"},"modified":"2023-12-22T05:41:51","modified_gmt":"2023-12-22T05:41:51","slug":"ncert-solutions-class-10-science-chapter-2-acids-bases-and-salts","status":"publish","type":"post","link":"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-10-science-chapter-2-acids-bases-and-salts\/","title":{"rendered":"NCERT Solutions Class 10 (Science) Chapter 2 (Acids Bases and Salts)"},"content":{"rendered":"

NCERT Solutions Class 10 Science\u00a0<\/span><\/strong><\/h2>\n

The NCERT Solutions in English Language for Class 10 Science Chapter – 2 (Acids Bases and Salts) <\/strong>has been provided here to help the students in solving the questions from this exercise.\u00a0<\/span><\/p>\n

Chapter – 2 (Acids Bases and Salts)\u00a0<\/span><\/strong><\/h2>\n

Questions<\/strong><\/span><\/p>\n

1. You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution respectively. If you are given only red litmus paper, how will you identify the contents of each test tube ?<\/strong><\/span>
\nAnswer – <\/strong>A few drops of red litmus solution is added to each test tube. Red colour will become light in the test tube containing water. Colour will turn blue in test tube containing basic solution. Red colour will become dark in the test tube containing acidic solution.
\n<\/span><\/p>\n

 <\/p>\n

Questions<\/strong><\/span><\/p>\n

1. Why should not curd and sour substances be kept in containers made up of brass or copper ?
\n<\/strong>Answer – <\/strong>Both curd and sour substances contain some acids in them. They react with copper or brass vessels to form certain salts which are of poisonous nature. Therefore, it is not advisable to keep them in these containers.<\/span><\/p>\n

2.Which gas is usually liberated when an acid reacts with a metal ? Illustrate with an example. How will you test the presence of this gas ?<\/strong><\/span>
\nAnswer – <\/strong>Metals are mostly reactive in nature. They react with dilute acids (HCl and H2<\/sub>SO4<\/sub>) to evolve hydrogen gas. For example,<\/span>
\n\"NCERT<\/span>
\nThe gas burns with a pop sound when a burning candle is brought near it.<\/span><\/p>\n

3.<\/strong> Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.
\n<\/strong>Answer<\/strong> –\u00a0<\/strong>Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.
\n<\/span>C<\/span>a<\/span>C<\/span>O<\/span><\/span><\/span>3<\/span><\/sub>(<\/span>s<\/span><\/em><\/span><\/span><\/span><\/span><\/span><\/span>) <\/span><\/span><\/span><\/span><\/span><\/span><\/span>+ <\/span>2<\/span>H<\/span>C<\/span>l<\/span><\/span><\/span>(<\/span>a<\/span>q<\/span><\/span><\/span><\/em>)\u00a0<\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u2192 <\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u00a0C<\/span>a<\/span>C<\/span>l<\/span><\/span><\/span>2<\/span><\/sub>(<\/span>a<\/span>q<\/span><\/span><\/span><\/em>)<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u00a0+ C<\/span>O<\/span><\/span><\/span>2<\/span><\/sub>(<\/span>g<\/span><\/em>) <\/span><\/span><\/span><\/span><\/span><\/span><\/span>+ H<\/span><\/span><\/span>2<\/span><\/span><\/span><\/sub><\/span>O<\/span><\/span><\/span>(<\/span>l<\/span><\/em>)<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

Questions<\/strong><\/span><\/p>\n

1.<\/strong> Why do HCl, HNO3\u00a0<\/sub>, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?
\n<\/b>Answer<\/strong> –\u00a0<\/strong>The dissociation of HCI or\u00a0 HNO3<\/sub>\u00a0to form hydrogen ions always occurs in the presence of water. Hydrogen ions (H+<\/sup>) combine with H2<\/sub>O to form hydronium ions 3O+<\/sup><\/span>
\nThe reaction is as follows:
\n<\/span>HCl(aq<\/em>) \u27f6 H+ <\/sup>+ Cl\u2212
\n<\/sup><\/span>H+ <\/sup>+ H2<\/sub>O \u27f6 H3<\/sub>O+<\/sup><\/span><\/span><\/p>\n

2. Why does an aqueous solution of an acid conduct electricity?<\/b><\/span>
\nAnswer<\/strong> –\u00a0<\/strong>Acids dissociate in aqueous solutions to form ions. These ions are responsible for conduction of electricity.<\/span><\/p>\n

3. Why does dry HCl gas not change the colour of the dry litmus paper?<\/b><\/span>
\nAnswer<\/strong> –\u00a0<\/strong>Colour of the litmus paper is changed by the hydrogen ions. Dry HCI gas does not contain H+<\/sup> ions. It is only in the aqueous solution that an acid dissociates to give ions. Since in this case, neither HCI is in the aqueous form nor the litmus paper is wet, therefore, the colour of the litmus paper does not change.<\/span><\/p>\n

4. While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?<\/b><\/span>
\nAnswer<\/strong> –\u00a0<\/strong>Since the process of dissolving an acid in water is exothermic, it is always recommended that acid should be added to water. If it is done the other way, then it is possible that because of the large amount of heat generated, the mixture splashes out and causes burns.<\/span><\/p>\n

5. How is the concentration of hydronium ions H3<\/sub>O+<\/sup>\u00a0affected when a solution of an acid is diluted?<\/b><\/span>
\nAnswer<\/strong> –\u00a0<\/strong>When an acid is diluted, the concentration of hydronium ions H3<\/sub>O+<\/sup>\u00a0 per unit volume decreases. This means that the strength of the acid decreases.<\/span><\/p>\n

6. How is the concentration of hydroxide ions OH\u2212<\/sup>\u00a0 affected when excess base is dissolved in a solution of sodium hydroxide?
\n<\/b>Answer<\/strong> –\u00a0<\/strong>The concentration of hydroxide ions OH\u2212<\/sup>\u00a0would increase when excess base is dissolved in a solution of sodium hydroxide.<\/span><\/p>\n

Questions<\/strong><\/span><\/p>\n

1. You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?<\/b><\/span>
\nAnswer<\/strong> –\u00a0<\/strong>A pH value of less than 7 indicates an acidic solution, while greater than 7 indicates a basic solution. Therefore, the solution with pH = 6 is acidic and has more hydrogen ion concentration than the solution of pH = 8 which is basic.<\/span><\/p>\n

2. What effect does the concentration of H+<\/sup>\u00a0(aq) ions have on the nature of the solution?<\/b><\/span>
\nAnswer<\/strong> –\u00a0<\/strong>concentration of H+<\/sup>\u00a0(aq) can have a varied effect on the nature of the solution.With an increase in ion concentration, the solution becomes more acidic, while a decrease of H+<\/sup> ion causes an increase in the basicity of the solution.<\/span><\/p>\n

3. Do basic solutions also have H+<\/sup>(aq) ions? If yes, then why are these basic?<\/b><\/span>
\nAnswer<\/strong> –\u00a0<\/strong>Yes, basic solution also has H+<\/sup>(aq) ions. However, their concentration is less as compared to the concentration of OH\u2212<\/sup> ions that makes the solution basic.<\/span><\/p>\n

4. 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)?
\n<\/b>Answer<\/strong> –\u00a0<\/strong>If the soil is acidic and improper for cultivation, then to increase the basicity of soil, the farmer would treat the soil with quicklime or slaked lime or chalk <\/span>
\n2NaHCO3<\/sub>\u00a0\u27f6\u00a0 Na2CO3<\/sub>\u00a0+ H2<\/sub>O + CO2<\/sub><\/span><\/p>\n

Questions<\/strong><\/span><\/p>\n

1. What is the common name of the compound CaOCl2<\/sub>?<\/b><\/span>
\nAnswer<\/strong> –\u00a0<\/strong>Bleaching powder.<\/span><\/p>\n

2. Name the substance which on treatment with chlorine yields bleaching powder.<\/b><\/span>
\nAnswer<\/strong> –\u00a0<\/strong>Slaked lime or calcium hydroxide.<\/span><\/p>\n

3. Name the sodium compound which is used for softening hard water.<\/b><\/span>
\nAnswer<\/strong> –\u00a0<\/strong>Sodium carbonate is used for softening hard water.<\/span><\/p>\n

4. What will happen if a solution of sodium hydrocarbonate is heated? Give the equation of the reaction involved.
\n<\/b>Answer<\/strong> –\u00a0<\/strong>When a solution of sodium hydrocarbonate (sodium hydrogen carbonate) is heated, sodium carbonate and water are formed with the evolution of carbon dioxide gas.<\/span><\/p>\n

5. Write an equation to show the reaction between Plaster of Paris and water.<\/b><\/span>
\nAnswer – <\/strong>The chemical equation for the reaction of Plaster of Paris and water is<\/span>
\nCaSO4<\/sub>.1\/2H2<\/sub>O + 3\/2H2<\/sub>O\u00a0\u2192\u00a0CaSO4<\/sub>.2H2<\/sub>O<\/span><\/p>\n

Exercise<\/span><\/strong><\/span><\/p>\n

1. A solution turns red litmus blue, its pH is likely to be<\/b><\/span>
\n(a) 1<\/span>
\n(b) 4<\/span>
\n(c) 5<\/span>
\n(d) 10<\/span>
\nAnswer – <\/strong>(d) <\/span><\/p>\n

2. A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains<\/b><\/span>
\n(a) NaCl<\/span>
\n(b) HCl<\/span>
\n(c) LiCl<\/span>
\n(d) KCl<\/span>
\nAnswer – <\/strong>(b)<\/span><\/p>\n

3. 10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. 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<\/b><\/span>
\n(a) 4 mL<\/span>
\n(b) 8 mL<\/span>
\n(c) 12 mL<\/span>
\n(d) 16 mL<\/span>
\nAnswer – <\/strong>(d) <\/span><\/p>\n

4. Which one of the following types of medicines is used for treating indigestion?<\/b><\/span>
\n(a) Antibiotic<\/span>
\n(b) Analgesic<\/span>
\n(c) Antacid<\/span>
\n(d) Antiseptic
\n<\/span>Answer – <\/strong>(c) Antacid is used for treating indigestion.<\/span><\/span><\/p>\n

5. Write word equations and then balanced equations for the reaction taking place when –<\/b><\/span>
\n(a)<\/strong> dilute sulphuric acid reacts with zinc granules.<\/span>
\nAnswer –\u00a0<\/strong>Zinc + Sulphuric acid\u00a0 Zinc sulphate + Hydrogen
\nH2<\/sub>SO4(aq) + Zn(s)\u00a0 \u27f6 ZnSO4<\/sub>(aq) + H2<\/sub>\u00a0(g)<\/span><\/p>\n

(b)<\/strong> dilute hydrochloric acid reacts with magnesium ribbon.<\/span>
\nAnswer –\u00a0<\/strong>Magnesium +\u00a0 Sulphuric acid\u00a0 magnesium chloride +Hydrogen gas
\nMg (s)<\/em> + 2HCl (aq)<\/em> \u2192 MgCl2 <\/sub>(aq)<\/em> + H2 <\/sub>(g)<\/em><\/span><\/p>\n

(c)<\/strong> dilute sulphuric acid reacts with aluminium powder.<\/span>
\nAnswer –\u00a0<\/strong>Aluminum + Sulphuric acid\u00a0 Aluminum sulphate +Hydrogen gas
\n3H2<\/sub>SO4<\/sub>\u00a0+ 2Al \u2192 Al2 <\/sub>(SO4<\/sub>)3<\/sub>\u00a0+ 3H2<\/span><\/p>\n

(d)<\/strong> dilute hydrochloric acid reacts with iron filings.<\/span>
\nAnswer – <\/strong><\/span>Iron + Hydrochloric acid\u00a0 Iron chloride + Hydrogen<\/span><\/span>
\n6HCl (aq)<\/em> + 3Fe(s)<\/em> \u2192 3FeCl2 <\/sub>(aq)<\/em> + 3H2 <\/sub>(g)<\/em><\/span><\/p>\n

6. Compounds such as alcohols and glucose also contain hydrogen but are not categorised as acids. Describe an Activity to prove it.<\/b><\/span>
\nAnswer – <\/strong>A<\/span>lcohol and glucose both contain hydrogen but not categorized as acids. This can be proved by following activity.<\/span><\/span>
\n\"NCERT<\/span>
\nMaterial required :-<\/strong>\u00a0Beaker, nails, battery, connecting wires, bulb, switch and alcohols.<\/span>
\nProcedure :<\/strong><\/span>
\n1. Set up the experiment as follows<\/span>
\n2. Take ethyl alcohol in the beaker in the beaker.<\/span>
\n3. When the switch is turned on, the bulb does not glow.<\/span>
\n4. Take glucose solution in place of alcohols but bulb does not glow.<\/span><\/p>\n

7. Why does distilled water not conduct electricity, whereas rain water does?<\/b><\/span>
\nAnswer – <\/strong>Distilled water is a pure form of water and is devoid of any ionic species. Therefore, it does not conduct electricity. Rain water, being an impure form of water, contains many ionic species such as acids and therefore it conducts electricity.<\/span><\/p>\n

8. Why do acids not show acidic behaviour in the absence of water?<\/b><\/span>
\nAnswer – <\/strong>Acids do not show acidic behaviour in the absence of water because the dissociation of hydrogen ions from an acid occurs in the presence of water only. It is the hydrogen ions that are responsible for the acidic behaviour.<\/span><\/p>\n

9. Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is<\/b><\/span>
\n(a) neutral?<\/span>
\n(b) strongly alkaline?<\/span>
\n(c) strongly acidic?<\/span>
\n(d) weakly acidic?<\/span>
\n(e) weakly alkaline?<\/span>
\nArrange the pH in increasing order of hydrogen-ion concentration<\/span>
\nAnswer –
\n<\/strong><\/span>(a) D<\/span><\/span>
\n(b) C<\/span>
\n(c) B<\/span>
\n(d) A<\/span>
\n(e) E<\/span><\/p>\n

10. 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 (CH3<\/sub>COOH) is added to test tube B. Amount and concentration taken for both the acids are same. In which test tube will the fizzing occur more vigorously and why?<\/b><\/span>
\nAnswer – <\/strong>HCl is stronger acid than CH3<\/sub>COOH. Therefore, H+ ions concentration in test tube A will be more than that in test tube B. hence, reaction will take place faster in test tube A than in test tube B. so, fizzing will occur more vigorously in test tube B.<\/span><\/p>\n

11. Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer.
\n<\/b><\/span>Answer – <\/strong>The pH of milk is 6. As it changes to curd, the pH will reduce because curd is acidic in nature. The acids present in it decrease the PH.<\/span><\/span><\/p>\n

12. A milkman adds a very small amount of baking soda to fresh milk.<\/b><\/span>
\n(a)<\/strong> Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
\nAnswer – <\/strong>The milkman shifts the pH of the fresh milk from 6 to slightly alkaline because in alkaline condition, milk does not set as curd easily.<\/span><\/p>\n

(b)<\/strong> Why does this milk take a long time to set as curd?
\n<\/span>Answer – <\/strong>Since this milk is slightly basic than usual milk, acids produced to set the curd are neutralized by the base. Therefore, it takes a longer time for the curd to set.<\/span><\/span><\/p>\n

13. Plaster of Paris should be stored in a moisture-proof container. Explain why?<\/b><\/span>
\nAnswer – <\/strong>Plaster of Paris reacts with moisture to form gypsum and sets to a hard mass. Therefore, it should be stored in moisture-proof container.<\/span><\/p>\n

14. What is a neutralisation reaction? Give two examples.<\/b><\/span>
\nAnswer –
\n(i)<\/strong> A reaction in which an acid and base react with each other to give a salt and water is termed as neutralization reaction. In this reaction, energy is evolved in the form of heat.
\n<\/span>For example :-<\/strong> NaOH + HCl \u27f6 NaCl+H2<\/sub>O
\n<\/span>(ii)<\/strong> During indigestion (caused due to the production of excess of hydrochloric acid in the stomach), we administer an antacid (generally milk of magnesia, Mg(OH)2 which is basic in nature). The antacid neutralizes the excess of acids and thus gives relief from indigestion.<\/span><\/span>
\nMg(OH)2<\/sub>\u00a0+ 2HCl \u2192 MgCl2<\/sub>+2H2<\/sub>O<\/span><\/p>\n

15. Give two important uses of washing soda and baking soda.<\/b><\/span>
\nAnswer – Uses of washing soda :<\/strong><\/span>
\n(i) As cleansing agent.<\/span>
\n(ii) Removing permanent hardness of water.<\/span>
\n(iii) Used in glass, soap and paper industries.<\/span>
\nUses of baking soda :<\/strong><\/span>
\n(i) For making baking powder
\n<\/span>(ii) As ingredient of antacid.<\/span><\/span><\/p>\n

Go Back To Chapters<\/i><\/b><\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

NCERT Solutions Class 10 Science\u00a0 The NCERT Solutions in English Language for Class 10 Science Chapter – 2 (Acids Bases and Salts) has been provided here to help the students in solving the questions from this exercise.\u00a0 Chapter – 2 (Acids Bases and Salts)\u00a0 Questions 1. You have been provided with three test tubes. 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