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. (c) SO3 Substances wrhich given differnet colours with acid and base are called acid – base indicators. Hydrochloric acid is used for removing the deposits from inside the boilers. 1. (c) Tartaric acid Answer: They, generally, do not react with water. Which one of the following oxides will react with acids to salt and water – Give two examples. Potash alum or phitkari: These substances are neither acidic nor basic. Question 5. Nitric acid (HNO3) is used by goldsmiths for cleaning gold and silver ornaments. 16 - Give reason why copper is used to make hot water tanks and not steel (an alloy of iron). (d) CuO. Answer: Acids are compounds that contain hydrogen e.g., H, Acids are compounds which form hydronium ion (H. Acids react with carbonates and bicarbonates to give carbon dioxide gas. Washing Soda: Na2CO3.10H2O. For example. Put one piece of blue litmus paper into each of these solutions. Explain why these sour substances are effective in cleaning the vessels. Log in. 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. What will you do if some acid is split on the table? Then, one of the solutions is added to it gradually. (b) lime stone, calcium hydroxide MP Board Textbook Solutions for Class 6 to 12. Write their properties. The seas are great sources of salts. It it turns blue litmus red, it is acidic. But, copper does not react with water. These are solid in the form of tablets called antacids. [CBSE 2013, 2013] Ans. Answer: Both acids and bases changes colour of all indicators. Bases: We observe that colour of the litmus paper is not change. Take a tablespoonful of turmeric powder. Sulphuric acid is c.’led ‘King of chemicals’. However, iron reacts with steam. Cut thin strips of the yellow paper obtained. If an indicator gives a colour change with an acid, it does give a change with a base. Answer: (T/F). Blue litmus turns red by – Answer: If an indicator changes colour with a base, it does not change colour with an acid. Choose the correct alternative, Question (i) (d) Baking soda. Give two examples. (i) Iron with steam . State ditterences between acids and bases? (b) Alkali 5. Answer: It neutralises the effect of excessive acid. No, we should not taste unknown substances. How would you verify it? (ii) Copper does not react with any state of water. Name the gas obtained when a metal carbonate reacts with an acid? It is used as medicine to reduce acidity of the stomach. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Question 5. Long Answer Name some common acid and alkali indicators? Acid + Base → Salt + Water The acids which are prepared by dissolving in water, are known as concentrated acid. Explain. Answer: Copper does not reach with tamarind (imli) water. (d) lime water and ash. Question 15. Put a drop of distilled water on a strip of the red litmus paper with the help of a droper. (c) Aluminium forms oxide layer on its surface which does not further react with air. Answer: Why? The citric acid present in the lemon or tamarind neutralises the basic copper carbonate and dissolves the layer. 1. Containers/ vessels made from which material are safe to store acids? Question 2. What are acids? Question (iv) 4. (b) Sweet in taste The citric acid present in the lemon or tamarind neutralises the basis copper carbonate and dissolves the layer. Bases are compound which have hydroxyl group. Click here 👆 to get an answer to your question ️ Give reason : copper does not react with tamarid water 1. For examples: Question 14. Question 1. Acids, Bases and Salts Very Short Answer Type Questions. Factory waste is neutralised before disposing it into the water bodies. They are less corrosive and are used in food ingradients. Our stomach contains hydrachloric acid. The solutions which do not change the colour of either red or blue litmus are knwon as neutral solutions. What is the use of this solution? It is used to prepare other compounds such as glass, caustic soda and detergent poweders. Use this solution to write the message on a sheet of white paper with a cotton bud. (ii) Tamarind contains acid which reacts with basic copper carbonate and product gets dissolved and removed from copper vessel. (a) Write the electron dot structures of sodium, oxygen and magnesium. All the acids react with metals. While …………. Find out the medicines, he prescribes to treat acidity Ask him how acidity can be prevented? Question (vi) The sea water is trapped in shallow called lagoons and is allowed to evaporate in sunlight to white solid crystal of salts. Reaction with water/steam : Reactive metals like K, Na, Ca Al, Fe displace hydrogen from water or steam. 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