Keep the mixture for some time till water becomes coloured. Name two acid – base indicators. That is why copper is used to make hot water tanks, and not steel. Bases are substances which have one or more replaceable hydroxyl group (OH). Choose the correct alternative, Question (i) Its properties are: Question 2. Answer: (i) Copper is a better conductor of heat than steel. (b) Tamarind contains acid which reacts with basic copper carbonate and product gets dissolved and removed from copper vessel. Water filters can also be used to reduce copper levels in home drinking water supplies. Question 11. Explain in detail. Answer: Which acids are present in following substance: Now, the base is taken and turmeric is added. If the solution turns yellow again, the added liquid is hydrochloric acid because it neutralises the base. It is used for the manufacture of fertilizers. It reacts with water and produces sodium hydroxide and hydrogen gas along with large amount of heat. Answer. 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. (d) Acid is boiled before adding water. Bases: Answered One of the mineral acid, hydrochloric acid (HCl) present in our stomach helps in digestion of food. Put a drop of the above solution on a strip of the red litmus paper with the help of a dropper. (in) Aluminium forms oxide layer on its surface which does not further react with air. 1.5 What happen when acid react with metal hydrogen Carbonate? Acids are substances which contain one or more replaceable hydrogen atoms. 1.1 What happen when acid react with metal? (b) Alkali Use it as an indicator and test the acidic and basic solutions with it. Class-8 These acids are called mineral acids because these are prepared from minerals. The Pourbaix diagram for copper in pure water, perchloric acid or sodium It can be seen that copper in "pure" water ⦠It is also used for making synthetic fibres such as nylon and nitric acid, which are used for the preparation of synthetic cloth. Question 10. If using green tamarind, peel the hard outer skin. It will turn red. Copper does not react with cold water, hot water, or steam. Write down its properties. Change of colour in an acid and a base depends on the type of the indicator. He has to serve tire drinks on the demand of customers. Organic acid are soured milk, lemon, green mangoes and karvanda are sour tasting. The seas are great sources of salts. Examples: Lactic acid, Citric acid, Vinegar, Formic acid. 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. 5. State one characteristic property of all acids. That is why copper is used to make hot water tanks, and not steel. Question 9. (b) lime stone, calcium hydroxide, Question (viii) For example. However, iron reacts with steam. Question 3. MP Board Textbook Solutions for Class 6 to 12. 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. K2SO4.Al2(SO4)324H2O (c) Bitter in taste. The substance which are used to identify whether a substance is an acid or base is called indicators. Copper does not react with water or acids to rrelease H2. Similarly test the solutions listed in table and note down your observations. Nitric acid (HNO3) is used by goldsmiths for cleaning gold and silver ornaments. But too mcuh of acid in the stomach causes indigestion. (a) Sodium In fact you get a brown precipitate of copper and a blue solution of copper(II) sulphate because of the disproportionation reaction. So, the acids are not stored in metal containers. Vessels made from glass or cermics are considered safe for strong acids. Differences between acids and bases: It it turns blue litmus red, it is acidic. How will Dorji decide which drink is to be served to whom? Otherwise the added liquid is sugar solution. Answer: Activity 3 Aluminium does not react even with hot water. Acid salt: 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: Answer: Answer: Bases are the compound which have one or more hydroxyl group (OH) in their molecule. Then, one of the solutions is added to it gradually. What are organic acids? Alum (Phitkari) acts as a antacid. Note down if there is any change in colour. It turns red litmus blue. Answer: Activity 2 Give reasons why copper is used to make hot water tanks and not steel (analloy of iron). This process is known as descaling. The citric acid present in the lemon or tamarind neutralises the basis copper carbonate and dissolves the layer. Join now. is present in lemon. So the factory wastes are neutralised by adding basic substances. Three liquids are given to you. Visit a doctor. Potash alum or phitkari: Perform the same activity with the following substances: Question 1. Question 4. 16 - Give reason why copper is used to make hot water tanks and not steel (an alloy of iron). Answer: Question 5. A litre of a water contains about 35 grams of salts. Give reason : copper does not react with tamarid water 2 See answers You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. H + ions are produced when HCl gas comes into contact with water. Sodium hydroxide turns blue litmus red. Reactions of metals Reactions with water. The sea water is trapped in shallow called lagoons and is allowed to evaporate in sunlight to white solid crystal of salts. 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. Answer: Acids, Bases and Salts Short Answer Type Questions. Do with the help of your subject teacher. Add some warm water. (b) lime stone, calcium hydroxide 1. What does this indicate about the chemical nature of the solution? Copper does not react with cold water, hot water or steam. That bottle which turns red litmus blue contains sodium hydroxide (base). Answer: In pickles and jam for preserving it in good condition for long duration. However, in the presence of water, copper is bound to tarnish more quickly. Question (vi) It remains blue. (d) CuO. 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. 12. Acitivity 4 State the colour of dry litmus paper when placed in separate samples of dilute sulphuric acid, moist ammonia gas, moist chlorine, sodium hydroxide, lemon juice, vinegar and water into which sulphur dioxide gas has been bubbled for some time? (d) lime water and ash. Magnesium burns in air to form …………. (c) Bitter in taste Bases are substances which have one or more replaceable hydroxyl group (OH). Mark ‘T’ if the statement is true and ‘F’ if it is false: Question 7. Bases are – Acids are substances which contain one or more replaceable hydrogen atoms. MP Board Class 10th Science Chapter 3 Multiple Choice Questions. Answer: Question 16. (b) Sweet in taste Calamine solution is applied on the skin when an ant bites. Prepare red cabbage juice by boiling a piece of red cabbage in water. Question 11. (d) Baking soda. Question 3. Bases are the compound which have one or more hydroxhyl group (OH) in their molecule. Acids are compounds that contain hydrogen. If the colour changes to red, acid is present. 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. Question 1. Answer: Answer: Acids react with metal to form salts and release hydrogen gas. Question 3. How is salt obtained from sea – water? (b) Sodiujn sulphate It is used to prepare other compounds such as glass, caustic soda and detergent poweders. Write one use of each of the following compounds? KON, HNO3, Ca(OH)2, LiOH, CH3COOH, HCOOH, Mg(OH)2, NaOH, H2SO4, HCl Acid + Base → Salt + Water However, iron reacts with steam. Answer: Blue litmus paper is dipped in a solution. The distilled water is neutral. Use this solution to write the message on a sheet of white paper with a cotton bud. Answer: (a) Sour in taste Question 5. Write equations for the reactions of (i) iron with steam (ii) calcium and potassium with water. 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