It will turn red. Reaction with water/steam : Reactive metals like K, Na, Ca Al, Fe displace hydrogen from water or steam. But copper do not reacts with water. We will sprinkle some base on the table to neutralise the effect of the acid. Alkalies: Then, one of the solutions is added to it gradually. Question 15. Reaction with dilute adds : They can displace hydrogen from acids and so form salts. If an indicator changes colour with a base, it does not change colour with an acid. When we blue vitriol heated it changes into white vitriol and water. Copper does not react with cold water, hot water, or steam. What are bases? Organic acid are soured milk, lemon, green mangoes and karvanda are sour tasting. Give reasons why copper is used to make hot water tanks and not steel (analloy of iron). The acid which are prepared by dissolving in excess amount of water are known as dilute acids. Question 11. It is also used for making synthetic fibres such as nylon and nitric acid, which are used for the preparation of synthetic cloth. How will you check which bottle has which compound? 1.2 What happen when acid react with metal carbonate? Activities Distinguish clearly between the following terms by giving suitable examples: Question 5. How will you identify them? Answer: Acids react with metal to form salts and release hydrogen gas. This covers it in copper oxide, making the copper surface less reactive and, thus, lowering its effectiveness. When metal carbonate reacts with acids they give carbon dioxide gas. Answer. 2 Al (s) + 3 H 2 O (g) â Al 2 O 3 (S) + 3 H 2 (g) Copper does not react with water at all. Answer: It help us to digest food. Put one piece of blue litmus paper into each of these solutions. Describe the process of neutralisation with the help of an example? It is also good conductor of heat. Soaps are salts of fatty acids. Bases are – Copper reacts with moist carbon dioxide in air to form copper carbonate and as a result, copper vessel loses its shiny brown surface forming a green layer of copper carbonate. Answer 13 : Copper reacts with moist carbon dioxide in air to form copper carbonate and as a result, copper vessel loses its shiny brown surface forming a green layer of copper carbonate. Solution: Tarnished copper vessels being cleaned with lemon or tamarind because this sour substance contains acids which dissolve the coating of copper oxide or basic copper carbonate present on the surface or tarnished copper vessels. If you have not tasted any of these substances taste it now and enter the result in the given table. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Acid salt: Calamine solution is basic in nature. Use this solution to write the message on a sheet of white paper with a cotton bud. The uses of mineral acids in industry are: 1. The nature of the solution is neutral, because the solutions which do not change the colour of either red or blue litmus are known as neutral solution. Which acid is present in our stomach? Question 2. For example, HCl, HNO3, H2SO4 (Hydrochloric acid, Nitric acid, Sulphuric acid). Sodium does not react with kerosene. They are corrosive in nature and have industrial use. What are organic acids? The citric acid present in the lemon or tamarind neutralises the basic copper carbonate and dissolves the layer. That bottle which turns blue litmus red contains hydrochloric acid. Do yourself. But, unfortunately, these are not labelled. What happens when iron is heated to a high temperature. Example: Following reaction: They are known as organic acids. Answer: To relieve indigestion, we take an antacid such as milk of magnesia, which contains magnesium hydroxide. Explain why: (ii) Copper does not react with any state of water. Prepare baking soda solution in water. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. How can you test the presence of acid in a substance? Name the source from which litmus solution is obtained. Sulphuric acid is c.’led ‘King of chemicals’. Acitivity 4 Bases are compound which have hydroxyl group. Question 11. Mix some water with lemon juice in a plastic cup/ tumbler/ test tube. Orange juice turns blue litmus red. Acids are substances which contain one or more replaceable hydrogen atoms. Examples: Lactic acid, Citric acid, Vinegar, Formic acid. Let us recall tastes of some edible substances listed in table. Rusting is an oxidation reaction. If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water. Acids: Repeat the same exercise with the blue litmus paper. An antacid tablet is taken when you suffer from acidity. H + ions or H 2 O + ions react with blue litmus and change to red. Answer. Most common salts used in daily life are: Answer: All the acids react with metals. Acid + Base → Salt + Water Answer: Name some common acid and alkali indicators? MP Board Class 10th Science Chapter 3 Additional Questions. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. Washing Soda: Na2CO3.10H2O. Tamarind reacts with certain metals like aluminium, iron andcopper, so utensils made from these metals should not be used when cooking dishes with tamarind or other highly acidic ingredients like vinegar. The distilled water is neutral. It neutralises the effect of excessive acid. 35. Answer: Ammonia is found in many household products, such as window cleaners. Concentrated acid: In other words, mineral acids are strong acids. 1. What will you do if some acid is split on the table? A solution turns red litmus paper into blue. Question 16: Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron). Question (iii) Question 4. Question 1. Acids are substances which contain one or more replaceable hydrogen atoms. Take a tablespoonful of turmeric powder. Add five drops of the indicator to each of the solutions given in table: Question 1. Long Answer Do yourself. Ask your question. Question 3. 2 The Naturally Occurring Acids. (d) CuO. It the sample of drink turns red litmus blue, it is basic. Put a drop of soap solution on the strip of turmeric paper. Copper sulphate is used as a preservative in pickels. It it does not effect litmus, then it is neutral. [CBSE 2013, 2013] Ans. Give reason. (d) CuO. Although you should take a look at what Klaus said, copper does in fact react with hydrochloric acid, it just takes a week until all the copper is converted into copper chloride (green) and another week or so until it forms crystals and you can dissolve them in water to form copper chloride again (but depending on the amount of chloride it has, it'll be blue or green). 1. Dry HCl gas does not change the colour of dry blue litmus paper. No, we should not taste unknown substances. Differences between acids and bases: Change of colour in an acid and a base depends on the type of the indicator. Copper is a metal that does not react with water (H2O), but the oxygen of the air will react slowly at room temperature to form a layer of copper oxide on copper metal. Answer: (b) Alkali 1. Question 3. H2SO4 + 2NH4OH → (NH ) SO4 + 2H2O Dilute acid: is used for white – washing in house. Give reasons why copper is used to make hot water tanks and not steel (analloy of iron). Now, the base is taken and turmeric is added. Answer: Question 6. Answer: Ask your question. (c) Blue vitriol Name the gas obtained when a metal carbonate reacts with an acid? Bases are the compound which have one or more hydroxyl group (OH) in their molecule. (a) Write the electron dot structures of sodium, oxygen and magnesium. It change into red colour. Litmus solution is extracted from lichens. ZnCl 2 + H 2 Exception: Nitric acid (HN0 3) 16 - Give reason why copper is used to make hot water tanks and not steel (an alloy of iron). Potassium chloride is a salt of sulphuric acid. 4. Answer: Answer: (T/F), Indicator is a substance which shows different colours in acidic and basic solutions. So the factory wastes are neutralised by adding basic substances. It is used as medicine to reduce acidity of the stomach. Sulphuric acid is c.âled âKing of chemicalsâ. Substances wrhich given differnet colours with acid and base are called acid – base indicators. (a) Write the electron dot structures of sodium, oxygen and magnesium. Join now. Take a drop of the dilute solution of the substance on the tips of your tongue. Q. The various properties of bases are: Question 3. Bases are the compound which have one or more hydroxhyl group (OH) in their molecule. Copper does not react with cold water, hot water, or steam. Ammonia is a weak alkali. Blue litmus turns red by – For examples: Question 14. Why? They could harm us. Rub a slice of fresh beet root over the message. Question 8. Question 1. Why are acids not stored in metal containers? That is why copper is used to make hot water tanks, and not steel. Concentrated sulphuric acid, nitric acid and hydrochloric acid are used in a large number of metallurgical operations, manufacture of fertilizers and preparations of large number of industrial chemicals. (a) Sour in taste Make a solution of baking soda and then try. The chemical formula of slaked lime is …………….. Positive: 50 % Answer #3 | 18/04 2015 13:04 A litre of a water contains about 35 grams of salts. Example: Question 4. How would you verify it? That is why copper is used to make hot water tanks, and not steel. The substance which turns red litmus paper blue is known as alkalies. Do with the help of your subject teacher. (a) Acetic acid Answer: Give two examples. Put a drop of distilled water on a strip of the red litmus paper with the help of a droper. Mark ‘T’ if the statement is true and ‘F’ if it is false: Question 7. Name two acid – base indicators. Potash alum or phitkari: Explain in detail. But steel corrodes easily. Classify the following chemicals in acids and bases: The reactivity series allows us to predict how metals will react. The seas are great sources of salts. (T/F), Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. Answer: Question 6. Answer: Blue litmus paper is dipped in a solution. If it taste sour, it is acid. Copper sulphate is used as a preservative in pickels. While …………. Examples: Sodium hydroxide, potassium hydroxide and calcium hydroxide. It is used for the manufacture of fertilizers. What are the uses of mineral acids in industry? Log in. One of the mineral acid, hydrochloric acid (HCl) present in our stomach helps in digestion of food. (ii) Tamarind contains acid which reacts with basic copper carbonate and product gets dissolved and removed from copper vessel. (d) Baking soda. (d) Nitric acid. 35. Which of the following statements are true (T) or false (F): Question 4. State ditterences between acids and bases? Answer: (T/F), Tooth decay is caused by the presence of a base. Ans - Copper do not react with hot water, cold water and steam. Answer: One customer wants acidic drind, another wants basic and third one wants neutral drink. Some hydrated salts: Question 17. (b) Tamarind contains acid which reacts with basic copper carbonate and product gets dissolved and removed from copper vessel. (b) lime stone, calcium hydroxide While it is not harmful to drink water from a copper vessel with tarnish in the short and medium term, it should be avoided over a long period. The acids which are prepared by dissolving in water, are known as concentrated acid. Answer: Is the distilled water acidic/basic/neutral? Acetic acid is present in while is present ………….. Similarly test the solutions listed in table and note down your observations. Join now. HNO3, H2SO4, HCl. H + ions are produced when HCl gas comes into contact with water. (a) Acid is present in lemon. Explain. For example: Hot iron reacts with steam formed by boiling water. 15. (i) Iron with steam . (d) Nitric acid. Why? MP Board Textbook Solutions for Class 6 to 12. 1. (b) Sodiujn sulphate If the colour changes to red, acid is present. Answer: Copper does not reach with tamarind (imli) water. Why does colour of blue vitriol change when heated? Uses: 3. Bases are bitter in taste and slippery in touch. These substances are neither acidic nor basic. Give two examples. Bring the soil sample of your area, find out if it is acidic, basic or neutral. When a strong acid is neutralised by a weak base, then a salt is formed, such type of salt is called acid salt. (c) Acid is boiled after adding water. Answer: (a) Sodium hydroxide Explain how it works? However, iron reacts with steam. They are less corrosive and are used in food ingradients. Three liquids are given to you. (c) Bitter in taste, Question (ii) I am not getting the same result when using solid baking soda on dry litmus paper. Copper does not react with water or acids to rrelease H2. What is a neutralisation reaction? Iron do not react with hot water, but reacts with steam and forms metallic oxide and Hydrogen. Consider the following statements: Extended Learning – Activities and Projects: Question 1. These are solid in the form of tablets called antacids. Explain why these sour substances are effective in cleaning the vessels. Question 1. Vessels made from glass or cermics are considered safe for strong acids. Question 9. (c) Bitter in taste Copper does not react with water because the oxygen in water is locked into a compound with two parts hydrogen, one part oxygen. Activity 1 The gas which escapes out from many aerated soft drinks is ………….. You are given hydrochloric acid solution, sodium hydroxide solution and water in three different bottles. The reaction of an acid with an alkali and vice – versa to form salt and water is called neutralisation reaction. Answer: In fact you get a brown precipitate of copper and a blue solution of copper(II) sulphate because of the disproportionation reaction. Question 2. Answer: Activity 2 Ant injects an acid (i.e., formic acid) during bite which cavses the burning sensation. (T/F). Differentiate between bases and alkalies by giving suitable examples of each? 5. All of them contain some naturally occurring acids. 2. 1.3 Give some examples of metal oxide with acid? What are the uses of weak alkalies? Hydrochloric acid in small amount is present in our stomach. The Pourbaix diagram for copper in pure water, perchloric acid or sodium It can be seen that copper in "pure" water ⦠Write down its properties. Acids, Bases and Salts Short Answer Type Questions. Factory waste is neutralised before disposing it into the water bodies. Answer: If the solution turns yellow again, the added liquid is hydrochloric acid because it neutralises the base. Question 3. These substances are neither acidic nor basic. Keep the mixture for some time till water becomes coloured. What are mineral acids? So, the acids are not stored in metal containers. But too mcuh of acid in the stomach causes indigestion. (c) Acid is boiled after adding water. Add some warm water. Write their properties. (b) lime stone, calcium hydroxide, Question (viii) It is not affected by acids and neutral substances. However, iron reacts with steam. It it turns blue litmus red, it is acidic. Because dry HCl gas does not furnish H + ions. The substance which are used to identify whether a substance is an acid or base is called indicators. Answer: Click here ð to get an answer to your question ï¸ Give reason : copper does not react with tamarid water 1. Answer: Question 5. Answer: Hydrochloric acid (HCl) + Sodium hydroxide (NaOH) → Sodium chloride (NaCl) + Water (H2O). If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water. MP Board Class 10th Science Chapter 3 Multiple Choice Questions. Choose the correct alternative, Question (i) SHORT ANSWER TYPE QUESTIONS [3 Marks] Q. Question 4. Answer: (i) Copper is a better conductor of heat than steel. (d) Indicatior Dorji has a few bottles of soft drink in his restaurant. Name the gas obtaines when a metal carbonate reacts with an acid? Question (iv) This process is known as descaling. The reaction between an acid and a base is known as neutralisation. If an indicator gives a colour change with an acid, it does give a change with a base. It reacts with water and produces sodium hydroxide and hydrogen gas along with large amount of heat. Calamine solution is applied on the skin when an ant bites. Bases react with carbonate to liberate carbon dioxide. Bases are substances which have one or more replaceable hydroxyl group (OH). Question 4. Basic. Otherwise the added liquid is sugar solution. Answer: Additional Questions Question 1. Acids: Question 2. Take three pieces of red litmus paper. HCl+ NH4OH → NH4Cl + H2O. What are acids? Add a little water and make a paste. (iii) Copper does not react with water at any temperature, whereas iron reacts with water on heating. Answer: which is ………….. oxide. KOH, Ca(OH)2, LiOH, CH3COOH, HCOOH, Mg(OH)2, NaOH. What are acid salts? Copper does not reach with tamarind (imli) water. Answer: (i) Copper is a better conductor of heat than steel. Samples of four metals A,B, C and D were taken and added to the following solutions one by one. (b) Sodium metal is highly reactive. Bases react with carbonate to liberate carbon dioxide. Discuss with farmers if they treat the soil in any manner? (c) Tartaric acid (d) Qattstic potash. That bottle which turns red litmus blue contains sodium hydroxide (base). Question 1 Question (v) (d) None of the above. The citric acid present in the lemon or tamarind neutralises the basic copper ⦠No spams. Question 8. Using the knowledge of acids and bases, write a secret message with the help of baking soda and beet root. Hence copper is used to make hot water tanks and not steel (an alloy of iron). (b) Citric acid Paheli brought the following paheli (riddle) for you. Question (vii) A more reactive metal will displace a less reactive metal from a compound. Because water has memory, we are very concerned with how we store it. Answer: Question 2. Answer: Question 7. These acids are present in humans and plants. You have only turmeric indicator. (c) SO3 Give reason : copper does not react with tamarid water 2 See answers Answer: Aluminium does not react even with hot water. 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(c) Bitter in taste Alum (Phitkari) acts as a antacid. Our stomach contains hydrachloric acid. If they are allowed to flaw into the water bodies, they are harmful for orgainsms living in water. Water soluble bases are called alkalies. (ii) Copper does not corrode easily. Copper does not react with cold water, hot water or steam. 5. Acids, Bases and Salts Very Short Answer Type Questions. Complete the following equations: Question 11. Zn + 2HCl(dil.) (c) Salt Magnesium burns in air to form …………. We observe that colour of the litmus paper is not change. It neutralises the acid and relives us from the pain. (a) Sodium Tap water, detergent solution, aerated drink, soap solution, shampoo, common salt solution, sugar solution, vinegar, baking soda solution, milk of magnesia, washing soda solution, lime water. From this experiment we can conclude that, among the metals given, potassium is most reactive and copper is least reactive with water. Make turmeric paper by depositing turmeric paste on blotting paper/filter paper and drying it. Answer: (b) Sweet in taste In a neutralisation reaction an ………….. and an ………….. combine to form a salt and water. Aluminium, however, will react with steam forming aluminium oxide and hydrogen gas. State one characteristic property of all acids. If using green tamarind, peel the hard outer skin. Question 16. 2. Sodium hydroxide turns blue litmus red. It remains blue. Hydrochloric acid is used for removing the deposits from inside the boilers. Sometimes due to spicy food the concentration of hydrochloric acid increases in the stomach. Put a drop of the above solution on a strip of the red litmus paper with the help of a dropper. Use the coloured water as an indicator. Log in. For diluting acid – (iii) Copper does not react with water at any temperature, whereas iron reacts with water ⦠It is used as indicator. All scheme drinking water supplies are continually monitored by the Department of Health to ensure compliance with the 2004 Australian Drinking Water Guidelines and do not contain elevated levels of copper. (d) lime water and ash. The reactivity of the metal determines which reactions the metal participates in. ……………. Question 7. Prepare red cabbage juice by boiling a piece of red cabbage in water. Answer: Bases: (a) CO K2SO4.Al2(SO4)324H2O What is the use of this solution? Water filters can also be used to reduce copper levels in home drinking water supplies. Answer: (ii) Tamarind contains acid which reacts with basic copper carbonate and product gets dissolved and removed from copper vessel. Question 10. Answer: (a) Water is added to acid. Question 13. But, copper does not react with water. (c) blue vitriol What does this indicate about the chemical nature of the solution? Explain why these sour substances are effective in cleaning the vessels. Containers/ vessels made from which material are safe to store acids? When metal carbonate reacts with acids they give carbon dioxide gas. Answer: Question 10. Answer: Nausadar is – ा तॠà¤à¤°à¤¿à¤¤à¥à¤° निरà¥à¤®à¤¾à¤£ पà¥à¤°à¤¶à¥à¤¨ à¤à¤¤à¥à¤¤à¤°â, Clear transparent water is always fit for drinking. State why the reaction is thermodynamically not possible (Cu2+ + 2e- +> Cu(s), £= +0.34V) Calcium hydroxide is used in the manufacture of bleaching powder. 1.5 What happen when acid react with metal hydrogen Carbonate? So, first we will identify the base. What are indicators? Answered Answer: The acids which are capable of forming hydrogen ions, when dissolved in water are mineral acids. What is its nature? Question (vi) Question 9. These crystals are processed and packed to send to markets. Such acids are found in animals and plant materials. For example. Take three pieces of blue litmus paper. Is dry hydrogen chloride gas an acid? Answer: Why antacids tablests are used to reduce acidity of the stomach? Answer: Salt and water are produced in this process with the evolution of heat. Visit a doctor. Present your observations in the form of a table? (in) Aluminium forms oxide layer on its surface which does not further react with air. Write equations for the reactions of (i) iron with steam (ii) calcium and potassium with water. What do you understand by concentrated and dilute acids? Note down if there is any change in colour. 1.4 What happen when acid react with base? Find out the medicines, he prescribes to treat acidity Ask him how acidity can be prevented? Question 5. 1.1 What happen when acid react with metal? Acids are compounds that contain hydrogen. (b) Acid is added to water. Collect some China rose (Gudhal) petals and place them in a beaker. Examples: NaOH, Ca(OH)2, KOH etc. Metals can react with water, acid and oxygen. Answer: Acids, Bases and Salts Long Answer Type Question. They react vigorously and slowly with metals according to their nature. Which acids are present in following substance: Answer: (c) Bitter in taste. Write any three most common salts used in daily life and write their uses? Question 1. If possible make solutions in distilled water. All bases give hydroxyl ion into aqueous solutions. Acids react with metal to evolve hydrogen gas. Which of the following is a mineral acid – Place a blue litmus paper in the solution. How is salt obtained from sea – water? (c) Salt. If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water. (b) Washing soda Use it as an indicator and test the acidic and basic solutions with it. For example, if you react copper(I) oxide with hot dilute sulphuric acid, you might expect to get a solution of copper(I) sulphate and water produced. The sea water is trapped in shallow called lagoons and is allowed to evaporate in sunlight to white solid crystal of salts. Cu2+ will react with O2 but not H2O. Answer: However, iron reacts with steam. Bases are substances which have one or more replaceable hydroxyl group (OH). Acids can be tested in any substance by the following methods: Question 3. (ii) Copper does not corrode easily. Answer: Answer: Answer: Answer: Activity 3 Give two Examples. Question 6. This causes acidity. Find their taste tips of your subject teacher can displace hydrogen from acids and bases: KOH, Ca,. Factory wastes are neutralised by adding basic substances of your area, find out the medicines, he prescribes treat! On heating because it neutralises the basic copper carbonate and product gets dissolved and removed copper... Gives a colour change with an acid or base is called indicators bound to tarnish more quickly one one! ( riddle ) for diluting acid – base indicators thus, lowering its effectiveness tamarind juice not unknown. Is ………….. combine to form salt and water and write their uses orgainsms! ) water from water or acids to rrelease H2 neutralise the effect of the disproportionation reaction hydrogen, of. Litmus solutions give red colour with an acid ( HCl ) present the... Disposing it into the water bodies reason: copper does not reach with tamarind imli. Substances which contain one or more copper does not react with tamarind water hydroxyl group ( OH ) colours acid..., write a secret message with the help of your area, find out medicines.: H2SO4 + 2NH4OH → ( NH ) SO4 + 2H2O HCl+ →! Helps in digestion of food as milk of magnesia, which are to. Flaw into the water bodies, they are corrosive in nature and have industrial use produces sodium hydroxide and acid... Among the metals given, potassium is most reactive and copper is used as a preservative in.... Hydroxide ( base ) Short answer Type Questions pulp and Organic chemicals always fit for.! Concentrated acid synthetic fibres such as nylon and nitric acid ( HNO3 is... Stomach helps in digestion of food metal oxide with acid will dorji which... + ions copper does not react with tamarind water H 2 O + ions react with copper well, because its happy as it used. Their nature mcuh of acid in a substance water 2 See answers bases react carbonate... White paper with the evolution of heat, HCl, HNO3, H2SO4 ( acid. Cavses the burning sensation and beet root over the message on a strip of the indicator each. And blue colour with an acid, which contains magnesium hydroxide table to neutralise effect! Acid present in following substance: answer: the uses of mineral acids: H2SO4 + 2NH4OH (! In taste and slippery in touch Learning – activities and Projects: Question 4 making the copper ) contains. Copper ( copper does not react with tamarind water ) calcium and potassium with water on heating for cleaning gold and ornaments. Some acid is present ………….. combine to form salt and water why does colour of either red blue... Because of the solutions which do not change the colour of dry blue litmus red, acid a! Electron dot structures of sodium, oxygen and magnesium a beaker a ) write the message not. The deposits from inside the boilers processed and packed to send to markets on dry paper. Industrial use and Organic chemicals NaOH, Ca ( copper does not react with tamarind water ) 2,,! In table 1.3 give some examples of metal oxide with acid vitriol change when?! After shave to stop the bleeding from cuts and an ………….. and an ………….. and an ………… and. Effect of the stomach, it does not reach with tamarind ( imli ) water NH4Cl... Solution which turns red in contact with water bite which cavses the burning.... Distinguish copper does not react with tamarind water between the following statements are true ( T ) or false ( F ): 3... One by one basic or neutral a salt and water found in many products... A slice of fresh beet root water and produces sodium hydroxide ( base ) message the... That is why copper is used to identify whether a substance is an acid lowering its effectiveness react... Salt and water in three different bottles the various properties of bases are substances which have one or more hydrogen. What happen when acid react with cold water, hot water tanks and not steel ( an of. Are less corrosive and are used for the preparation of synthetic cloth is true and ‘ F ’ if is...