Uses: Save my name, email, and website in this browser for the next time I comment. The citric acid present in the lemon or tamarind neutralises the basis copper carbonate and dissolves the layer. Question 6. How will you identify them? Examples: Sodium hydroxide, potassium hydroxide and calcium hydroxide. Slit across lengthwise and remove seeds. In pickles and jam for preserving it in good condition for long duration. They, generally, do not react with water. Answer: (ii) Copper does not corrode easily. Consider the following statements: Extended Learning – Activities and Projects: Question 1. (a) Write the electron dot structures of sodium, oxygen and magnesium. Change of colour in an acid and a base depends on the type of the indicator. 1. Answer: Which is the common name of sodium bicarbonate – 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. (a) Water is added to acid. Question 6. What happens when iron is heated to a high temperature. Which of the following statements are true (T) or false (F): Question 4. (a) Sodium abishekcps abishekcps 31.07.2020 Chemistry Primary School +5 pts. What are indicators? (c) SO3 What will happen if blue litmus paper is soaked in orange juice? Sodium hydroxide turns blue litmus red. (b) Sodium metal is highly reactive. which is ………….. oxide. If using green tamarind, peel the hard outer skin. The acid which are prepared by dissolving in excess amount of water are known as dilute acids. Take a drop of the dilute solution of the substance on the tips of your tongue. But steel corrodes easily. Do yourself. Answer: Question 10. Ammonia is found in many household products, such as window cleaners. (d) lime water and ash. 2. If the solution turns yellow again, the added liquid is hydrochloric acid because it neutralises the base. Give two Examples. Answer: Answer: Give two examples? Bases are the compound which have one or more hydroxhyl group (OH) in their molecule. What are organic acids? Make turmeric paper by depositing turmeric paste on blotting paper/filter paper and drying it. (b) SO2 Hence copper is used to make hot water tanks and not steel (an alloy of iron). Calcium hydroxide is used in the manufacture of bleaching powder. 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. Mix some water with lemon juice in a plastic cup/ tumbler/ test tube. Orange juice turns blue litmus red. (c) blue vitriol (c) Bitter in taste, Question (ii) Answer: You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Question 9. Sulphuric acid is c.âled âKing of chemicalsâ. It the sample of drink turns red litmus blue, it is basic. Can I taste all substances to find their taste? Ans - Copper do not react with hot water, cold water and steam. Question 3. 1. (c) Salt. (a) Write the electron dot structures of sodium, oxygen and magnesium. Answer: Factory wastes contain both acidic and basic substances. 35. 2 The Naturally Occurring Acids. If an indicator changes colour with a base, it does not change colour with an acid. (b) lime stone, calcium hydroxide, Question (viii) Question 16. 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. Question 1. (d) CuO. But, unfortunately, these are not labelled. Answer: Describe the process of neutralisation with the help of an example? How can you test the presence of acid in a substance? It turns red litmus blue. Rub a slice of fresh beet root over the message. (b) Tamarind contains acid which reacts with basic copper carbonate and product gets dissolved and removed from copper vessel. 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. The reaction of an acid with an alkali and vice – versa to form salt and water is called neutralisation reaction. Keep the mixture for some time till water becomes coloured. Answer: Explain why these sour substances are effective in cleaning the vessels. But, copper does not react with water. When metal carbonate reacts with acids they give carbon dioxide gas. (a) CO K2SO4.Al2(SO4)324H2O Click here ð to get an answer to your question ï¸ Give reason : copper does not react with tamarid water 1. To relieve indigestion, we take an antacid such as milk of magnesia, which contains magnesium hydroxide. Acids are compounds that contain hydrogen. 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. H2SO4 + 2NH4OH → (NH ) SO4 + 2H2O It is used after shave to stop the bleeding from cuts. (c) Bitter in taste Question 5. Answer: Write their properties. You have only turmeric indicator. Put a drop of the above solution on a strip of the red litmus paper with the help of a dropper. Reaction with dilute adds : They can displace hydrogen from acids and so form salts. All the acids react with metals. Answer. (d) None of the above. Which acid is present in our stomach? Acids can be tested in any substance by the following methods: Question 3. 1.4 What happen when acid react with base? Question 11. Long Answer If an indicator gives a colour change with an acid, it does give a change with a base. How is salt obtained from sea – water? Explain why: The solution which turns red litmus paper blue is basic in nature. Then, one of the solutions is added to it gradually. MP Board Class 10th Science Chapter 3 Additional Questions. However, iron reacts with steam. (in) Aluminium forms oxide layer on its surface which does not further react with air. Due to this large heat, hydrogen catches fire while no such ⦠The distilled water is neutral. Answer: Question 7. Answer: Activity 3 Give reason : copper does not react with tamarid water 2 See answers Complete the following equations: Question 11. (T/F), Indicator is a substance which shows different colours in acidic and basic solutions. The substance which turns red litmus paper blue is known as alkalies. Bases react with carbonate to liberate carbon dioxide. It is used as medicine to reduce acidity of the stomach. It is used for the manufacture of fertilizers. Differentiate between bases and alkalies by giving suitable examples of each? It is used as indicator. Question 4. However, iron reacts with steam. Name two acid – base indicators. Answer: Collect some China rose (Gudhal) petals and place them in a beaker. Acid + Base → Salt + Water Question (iv) These acids are present in humans and plants. What is its nature? Factory waste is neutralised before disposing it into the water bodies. Bases are the compound which have one or more hydroxyl group (OH) in their molecule. Distinguish clearly between the following terms by giving suitable examples: Question 5. Using the knowledge of acids and bases, write a secret message with the help of baking soda and beet root. The seas are great sources of salts. Question 9. Soaps are salts of fatty acids. Answer: (b) Sodiujn sulphate Our stomach contains hydrachloric acid. H + ions are produced when HCl gas comes into contact with water. Acids are substances which contain one or more replaceable hydrogen atoms. Question 2. Containers/ vessels made from which material are safe to store acids? The sea water is trapped in shallow called lagoons and is allowed to evaporate in sunlight to white solid crystal of salts. It help us to digest food. Solution: 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. Examples: NaOH, Ca(OH)2, KOH etc. The gas which escapes out from many aerated soft drinks is ………….. (c) Salt So the factory wastes are neutralised by adding basic substances. Q. Question (iii) So, first we will identify the base. It remains blue. Write equations for the reactions of (i) iron with steam (ii) calcium and potassium with water. How would you verify it? (ii) Copper does not react with any state of water. Write one use of each of the following compounds? What are mineral acids? (d) Baking soda. If the colour changes to red, acid is present. Acids: For diluting acid – Log in. They are known as organic acids. Basic. 1.5 What happen when acid react with metal hydrogen Carbonate? Positive: 50 % Answer #3 | 18/04 2015 13:04 The reaction between an acid and a base is known as neutralisation. (b) Citric acid Bases are bitter in taste and slippry in touch. Answer: Copper does not react with water because the oxygen in water is locked into a compound with two parts hydrogen, one part oxygen. A litre of a water contains about 35 grams of salts. MP Board Textbook Solutions for Class 6 to 12. 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State why the reaction is thermodynamically not possible (Cu2+ + 2e- +> Cu(s), £= +0.34V) Put a drop of distilled water on a strip of the red litmus paper with the help of a droper. Present your observations in the form of a table? Nausadar is – But steel corrodes easily. Put one piece of red litmus paper into each of these solutions. HCl+ NH4OH → NH4Cl + H2O. Question 2. Tabulate the some hydrated salts with their chemical formulae and colour? Example: Question 4. Dorji has a few bottles of soft drink in his restaurant. Record your observations as in table. Examples: Lactic acid, Citric acid, Vinegar, Formic acid. That bottle which turns red litmus blue contains sodium hydroxide (base). Litmus solution is extracted from lichens. No, we should not taste unknown substances. Question 12. They react vigorously and slowly with metals according to their nature. What are the uses of mineral acids in industry? Classify the following chemicals in acids and bases: ा 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. Class-8 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. Take three pieces of blue litmus paper. Answer: (a) Sour in taste Water soluble bases are called alkalies. Question 6. Answer: Put a drop of soap solution on the strip of turmeric paper. Question 4. Do yourself. Why does colour of blue vitriol change when heated? Answer: Name the gas obtained when a metal carbonate reacts with an acid? Copper sulphate is used as a preservative in pickels. Blue litmus turns red by – That is why copper is used to make hot water tanks, and not steel. Answer. Acetic acid is present in while is present ………….. Prepare red cabbage juice by boiling a piece of red cabbage in water. It will turn red. Answer: Oxygen by it's self, reacts with copper to patina the copper. Find out the medicines, he prescribes to treat acidity Ask him how acidity can be prevented? Use the coloured water as an indicator. Hydrochloric acid (HCl) + Sodium hydroxide (NaOH) → Sodium chloride (NaCl) + Water (H2O). Answer: Acids, Bases and Salts Long Answer Type Question. Dilute acid: Ask your question. Put one piece of blue litmus paper into each of these solutions. Give reasons why copper is used to make hot water tanks and not steel (analloy of iron). One of the mineral acid, hydrochloric acid (HCl) present in our stomach helps in digestion of food. Now, the base is taken and turmeric is added. The citric acid present in the lemon or tamarind neutralises the basic copper carbonate and dissolves the layer. Question 4. Question 7. An antacid tablet is taken when you suffer from acidity. How will you check which bottle has which compound? Explain how it works? Hydrochloric acid is used for removing the deposits from inside the boilers. Join now. Give two examples. Additional Questions Question 1. Samples of four metals A,B, C and D were taken and added to the following solutions one by one. Ans. 1.1 What happen when acid react with metal? 1.3 Give some examples of metal oxide with acid? Choose the correct alternative, Question (i) Cu2+ will react with O2 but not H2O. The acids which are capable of forming hydrogen ions, when dissolved in water are mineral acids. Three liquids are given to you. Add a little water and make a paste. It is used to prepare other compounds such as glass, caustic soda and detergent poweders. This covers it in copper oxide, making the copper surface less reactive and, thus, lowering its effectiveness. (a) Caustic soda All bases give hydroxyl ion into aqueous solutions. (d) Nitric acid. How will Dorji decide which drink is to be served to whom? Answer: Copper does not react with water or acids to rrelease H2. Iron do not react with hot water, but reacts with steam and forms metallic oxide and Hydrogen. Note down if there is any change in colour. Name the source from which litmus solution is obtained. 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. Answer: (d) Qattstic potash. Activities When we blue vitriol heated it changes into white vitriol and water. Sulphuric acid is c.’led ‘King of chemicals’. That bottle which turns blue litmus red contains hydrochloric acid. water is happily married and so wont react with copper well, because its happy as it is. It is also used for making synthetic fibres such as nylon and nitric acid, which are used for the preparation of synthetic cloth. In a neutralisation reaction an ………….. and an ………….. combine to form a salt and water. Answer: Uses: 3. 15. Question 8. What are the uses of weak alkalies? ……………. Vessels made from glass or cermics are considered safe for strong acids. (b) Alkali The substance which are used to identify whether a substance is an acid or base is called indicators. 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). What are bases? (c) Blue vitriol Why are acids not stored in metal containers? 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. Because water has memory, we are very concerned with how we store it. What are acid salts? We will sprinkle some base on the table to neutralise the effect of the acid. Question 1. Question 10. Answer: Copper does not react with cold water, hot water, or steam. These substances are neither acidic nor basic. Is the distilled water acidic/basic/neutral? It neutralises the effect of excessive acid. Answer: Question 3. One customer wants acidic drind, another wants basic and third one wants neutral drink. They could harm us. (iii) Copper does not react with water at any temperature, whereas iron reacts with water on heating. It it turns blue litmus red, it is acidic. 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. Answer: Question 5. Most common salts used in daily life are: Metals can react with water, acid and oxygen. Cut thin strips of the yellow paper obtained. Bases are – What do you understand by concentrated and dilute acids? Question 13. Explain why these sour substances are effective in cleaning the vessels. (T/F). Otherwise the added liquid is sugar solution. KOH, Ca(OH)2, LiOH, CH3COOH, HCOOH, Mg(OH)2, NaOH. Turmeric solution turns red in contact with bases. Answer: (a) Sodium hydroxide Why? (ii) Tamarind contains acid which reacts with basic copper carbonate and product gets dissolved and removed from copper vessel. Acids: Question 2. Sometimes indigestion is painful. Acid salt: Answer: Answer: Bases are substances which have one or more replaceable hydroxyl group (OH). You are given hydrochloric acid solution, sodium hydroxide solution and water in three different bottles. The Pourbaix diagram for copper in pure water, perchloric acid or sodium It can be seen that copper in "pure" water ⦠16 - Give reason why copper is used to make hot water tanks and not steel (an alloy of iron). If you have not tasted any of these substances taste it now and enter the result in the given table. Acids are compounds that contain hydrogen e.g., H, Acids are compounds which form hydronium ion (H. 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