Answer: 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. (d) Baking soda. Litmus solution is extracted from lichens. Explain in detail. For diluting acid – 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. Click here 👆 to get an answer to your question ️ Give reason : copper does not react with tamarid water 1. Acids react with metal to form salts and release hydrogen gas. Question 11. 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. Answer: Which is the common name of sodium bicarbonate – The seas are great sources of salts. It is used for the manufacture of fertilizers. The citric acid present in the lemon or tamarind neutralises the basic copper carbonate and dissolves the layer. Hydrochloric acid is used for removing the deposits from inside the boilers. It turns red litmus blue. (a) Acid Question 4. Answer: 3. 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. (in) Aluminium forms oxide layer on its surface which does not further react with air. Discuss with farmers if they treat the soil in any manner? (c) Bitter in taste, Question (ii) (c) Bitter in taste Put a drop of the above solution on a strip of the red litmus paper with the help of a dropper. Ammonia is found in many household products, such as window cleaners. Basic. Answer: Answer: What is a neutralisation reaction? Explain. 1. Acids are substances which contain one or more replaceable hydrogen atoms. All bases give hydroxyl ion into aqueous solutions. Bring the soil sample of your area, find out if it is acidic, basic or neutral. Using the knowledge of acids and bases, write a secret message with the help of baking soda and beet root. If possible make solutions in distilled water. (c) blue vitriol (a) CO Give two examples. Magnesium burns in air to form …………. Question 8. Bases are compound which have hydroxyl group. MP Board Textbook Solutions for Class 6 to 12. (ii) Copper does not corrode easily. But steel corrodes easily. This causes acidity. (b) SO2 They, generally, do not react with water. For examples: Question 14. Question 1. The distilled water is neutral. Put one piece of blue litmus paper into each of these solutions. They are known as organic acids. What are the uses of mineral acids in industry? What are bases? Answer: Because water has memory, we are very concerned with how we store it. Examples: NaOH, Ca(OH)2, KOH etc. Answer: abishekcps abishekcps 31.07.2020 Chemistry Primary School +5 pts. Q. (a) Sour in taste But copper do not reacts with water. Use it as an indicator and test the acidic and basic solutions with it. The various properties of bases are: Question 3. Take three pieces of blue litmus paper. Copper does not reach with tamarind (imli) water. Answer: So, first we will identify the base. The reactivity of the metal determines which reactions the metal participates in. (c) Salt. Example: Following reaction: Why antacids tablests are used to reduce acidity of the stomach? What do you understand by concentrated and dilute acids? Question 16. Put a drop of distilled water on a strip of the red litmus paper with the help of a droper. 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. For example, litmus solutions give red colour with acids and blue colour with bases. All of them contain some naturally occurring acids. Take a tablespoonful of turmeric powder. Question 7. Do yourself. In other words, mineral acids are strong acids. Explain why: (T/F), Indicator is a substance which shows different colours in acidic and basic solutions. I am not getting the same result when using solid baking soda on dry litmus paper. Use the coloured water as an indicator. Answer: (i) Copper is a better conductor of heat than steel. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. 2 Al (s) + 3 H 2 O (g) → Al 2 O 3 (S) + 3 H 2 (g) Copper does not react with water at all. The solution which turns red litmus paper blue is basic in nature. Question 5. What are acid salts? Answer: Give reasons why copper is used to make hot water tanks and not steel (analloy of iron). Which of the following statements are true (T) or false (F): Question 4. SHORT ANSWER TYPE QUESTIONS [3 Marks] Q. Answer: Answer: (b) Citric acid Why? (d) Baking soda. Answer: 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. That bottle which turns red litmus blue contains sodium hydroxide (base). Answer: Acids react with metal to evolve hydrogen gas. These acids are called mineral acids because these are prepared from minerals. Answer: It neutralises the acid and relives us from the pain. Describe the process of neutralisation with the help of an example? Make a solution of baking soda and then try. These substances are neither acidic nor basic. Add a little water and make a paste. It is not affected by acids and neutral substances. Prepare red cabbage juice by boiling a piece of red cabbage in water. Hydrochloric acid in small amount is present in our stomach. Answer: Answer: Question 1 Put a drop of soap solution on the strip of turmeric paper. 1.5 What happen when acid react with metal hydrogen Carbonate? Then, one of the solutions is added to it gradually. Bases react with carbonate to liberate carbon dioxide. However, iron reacts with steam. Write their properties. Answer: Calamine solution is applied on the skin when an ant bites. Our stomach contains hydrachloric acid. HNO3, H2SO4, HCl. They are less corrosive and are used in food ingradients. Hence copper is used to make hot water tanks and not steel (an alloy of iron). 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. However, in the presence of water, copper is bound to tarnish more quickly. Change of colour in an acid and a base depends on the type of the indicator. Classify the following chemicals in acids and bases: Some hydrated salts: Question 17. Question 1. (b) Washing soda Otherwise the added liquid is sugar solution. It is also good conductor of heat. (a) Sodium Cut thin strips of the yellow paper obtained. Ans - Copper do not react with hot water, cold water and steam. So, the acids are not stored in metal containers. (c) Acid is boiled after adding water. (d) lime water and ash. (c) Tartaric acid Answer: Answer: Bases are substances which have one or more replaceable hydroxyl group (OH). Visit a doctor. (c) SO3 Answer: Most common salts used in daily life are: Distinguish clearly between the following terms by giving suitable examples: Question 5. Answer: (T/F). Answer: Question 7. water is happily married and so wont react with copper well, because its happy as it is. Question 11. Write equations for the reactions of (i) iron with steam (ii) calcium and potassium with water. Three liquids are given to you. 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. Answer: Similarly test the solutions listed in table and note down your observations. However, iron reacts with steam. The reactivity series allows us to predict how metals will react. Question 3. No, we should not taste unknown substances. Oxygen by it's self, reacts with copper to patina the copper. Copper does not react with water or acids to rrelease H2. Let us recall tastes of some edible substances listed in table. Sodium does not react with kerosene. Now, the base is taken and turmeric is added. 1. Question 1. Question 12. Question 2. The gas which escapes out from many aerated soft drinks is ………….. Examples: Lactic acid, Citric acid, Vinegar, Formic acid. Reactions of metals Reactions with water. Write any three most common salts used in daily life and write their uses? What are the uses of weak alkalies? Answer: Class-8 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. Rusting is an oxidation reaction. Answer: Aluminium does not react even with hot water. How will you identify them? (ii) Copper does not corrode easily. Name two acid – base indicators. Bases are bitter in taste and slippery in touch. What are indicators? Add five drops of the indicator to each of the solutions given in table: Question 1. The chemical formula of slaked lime is …………….. 4. State ditterences between acids and bases? How will Dorji decide which drink is to be served to whom? Uses: 3. Question 1. (ii) Tamarind contains acid which reacts with basic copper carbonate and product gets dissolved and removed from copper vessel. (c) Blue vitriol Organic acid contains COOH functional group. Write one use of each of the following compounds? This process is known as descaling. 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. H + ions or H 2 O + ions react with blue litmus and change to red. 1.1 What happen when acid react with metal? Answer: Activity 2 A more reactive metal will displace a less reactive metal from a compound. (d) CuO. Because dry HCl gas does not furnish H + ions. Answer: 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. Answer: Sodium chloride is the main salt. (a) Acetic acid (b) lime stone, calcium hydroxide Long Answer Question 9. State one characteristic property of all acids. These substances are neither acidic nor basic. (a) Sodium hydroxide Nausadar is – Question 9. Answer: Acids, Bases and Salts Long Answer Type Question. Copper does not react with water because the oxygen in water is locked into a compound with two parts hydrogen, one part oxygen. Ant injects an acid (i.e., formic acid) during bite which cavses the burning sensation. 3. What happens when iron is heated to a high temperature. (a) Write the electron dot structures of sodium, oxygen and magnesium. Do with the help of your subject teacher. Ask your question. Copper does not react with cold water, hot water, or steam. Question 15. We observe that colour of the litmus paper is not change. Question (iii) Question 16: Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron). Copper does not react with cold water, hot water or steam. Both acids and bases changes colour of all indicators. That bottle which turns blue litmus red contains hydrochloric acid. But too mcuh of acid in small amount is present, caustic soda and detergent poweders presence... 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