Give two examples. Log in. water is happily married and so wont react with copper well, because its happy as it is. However, iron reacts with steam. Acids can be tested in any substance by the following methods: Question 3. (c) Acid is boiled after adding water. Using the knowledge of acids and bases, write a secret message with the help of baking soda and beet root. State one characteristic property of all acids. Copper does not react with water or acids to rrelease H2. This covers it in copper oxide, making the copper surface less reactive and, thus, lowering its effectiveness. The citric acid present in the lemon or tamarind neutralises the basis copper carbonate and dissolves the layer. Acids, Bases and Salts Very Short Answer Type Questions. Place a blue litmus paper in the solution. Activity 1 5. If an indicator gives a colour change with an acid, it does give a change with a base. Ans - Copper do not react with hot water, cold water and steam. It change into red colour. Distinguish clearly between the following terms by giving suitable examples: Question 5. Question 1. Answer: (i) Copper is a better conductor of heat than steel. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Repeat the same exercise with the blue litmus paper. It neutralises the effect of excessive acid. Otherwise the added liquid is sugar solution. Why? (a) Sodium hydroxide (b) SO2 Acids: Question 2. Acids: The reaction between an acid and a base is known as neutralisation. (b) Sodium metal is highly reactive. Question 6. In other words, mineral acids are strong acids. The uses of mineral acids in industry are: 1. Answer: Copper does not react with cold water, hot water, or steam. Why are acids not stored in metal containers? Answered Answer: (c) Salt. That is why copper is used to make hot water tanks, and not steel. Perform the same activity with the following substances: 1. The citric acid present in the lemon or tamarind neutralises the basic copper … MP Board Class 10th Social Science Solutions, MP Board Class 10th Sanskrit Solutions Durva, MP Board Class 9th Social Science Solutions, MP Board Class 9th Sanskrit Solutions Durva, MP Board Class 8th Social Science Solutions, MP Board Class 8th Sanskrit Solutions Surbhi, MP Board Class 7th Social Science Solutions, MP Board Class 7th Sanskrit Solutions Surbhi, MP Board Class 6th Social Science Solutions, MP Board Class 6th Sanskrit Solutions Surbhi, MP Board Class 9th Maths Solutions Chapter 9 Areas of Parallelograms and Triangles Ex 9.3, MP Board Class 6th General English Essay Writing, MP Board Class 11th Maths Important Questions Chapter 9 Sequences and Series, MP Board Class 10th Science Solutions Chapter 16 Management of Natural Resources, MP Board Class 10th Science Solutions Chapter 15 Our Environment, MP Board Class 10th Science Solutions Chapter 11 Human Eye and Colourful World, MP Board Class 10th Science Solutions Chapter 4 Carbon and Its Compounds, MP Board Class 10th Science Solutions Chapter 9 Heredity and Evolution, MP Board Class 10th Science Solutions Chapter 14 Sources of Energy, MP Board Class 10th Maths Solutions Chapter 13 Surface Areas and Volumes Ex 13.3, MP Board Class 10th Maths Solutions Chapter 15 Probability Ex 15.1, MP Board Class 10th Maths Solutions Chapter 13 Surface Areas and Volumes Ex 13.4, MP Board Class 10th Maths Solutions Chapter 10 Circles Ex 10.2. (c) Tartaric acid However, in the presence of water, copper is bound to tarnish more quickly. Answer: Rub a slice of fresh beet root over the message. Answer: For example, HCl, HNO3, H2SO4 (Hydrochloric acid, Nitric acid, Sulphuric acid). What is the nature of the solution? Nitric acid (HNO3) is used by goldsmiths for cleaning gold and silver ornaments. Make a solution of baking soda and then try. Explain why these sour substances are effective in cleaning the vessels. The solutions which do not change the colour of either red or blue litmus are knwon as neutral solutions. KOH, Ca(OH)2, LiOH, CH3COOH, HCOOH, Mg(OH)2, NaOH. Answer: Activity 3 35. Washing Soda: Na2CO3.10H2O. Answer: You are given hydrochloric acid solution, sodium hydroxide solution and water in three different bottles. What happens when iron is heated to a high temperature. Question 3. Nausadar is – Give two Examples. 1.3 Give some examples of metal oxide with acid? Question 5. To reduce it some harmless bases are used like milk of magnesia [Mg (OH)2] and aluminium hydroxide, which balance the excess of acids. Add five drops of the indicator to each of the solutions given in table: Question 1. Differences between acids and bases: 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. Hydrochloric acid is used for removing the deposits from inside the boilers. Answer: 1. What are organic acids? Most common salts used in daily life are: is present in lemon. Question 3. 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. The acids which are prepared by dissolving in water, are known as concentrated acid. Answer: 3. Q. (ii) Copper does not corrode easily. 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? H + ions are produced when HCl gas comes into contact with water. Potash alum or phitkari: For examples: Question 14. What are bases? Question 4. Answer: Metals can react with water, acid and oxygen. Why does colour of blue vitriol change when heated? Explain how it works? (d) None of the above. But too mcuh of acid in the stomach causes indigestion. Answer: If the solution turns yellow again, the added liquid is hydrochloric acid because it neutralises the base. That bottle which turns red litmus blue contains sodium hydroxide (base). Is the distilled water acidic/basic/neutral? Water soluble bases are called alkalies. Calamine solution is applied on the skin when an ant bites. Answer: It the sample of drink turns red litmus blue, it is basic. (c) blue vitriol Question (iv) Bases: How will you identify them? How would you verify it? Water filters can also be used to reduce copper levels in home drinking water supplies. Name the gas obtained when a metal carbonate reacts with an acid? What are indicators? Bases are bitter in taste and slippery in touch. Answer: [CBSE 2013, 2013] Ans. Now, the base is taken and turmeric is added. It is used to prepare other compounds such as glass, caustic soda and detergent poweders. Reaction with water/steam : Reactive metals like K, Na, Ca Al, Fe displace hydrogen from water or steam. Acids, Bases and Salts Short Answer Type Questions. But, copper does not react with water. Which of the following is a mineral acid – Take three pieces of red litmus paper. Question 2. Ammonia is found in many household products, such as window cleaners. Zn + 2HCl(dil.) Complete the following equations: Question 11. Ant injects an acid (i.e., formic acid) during bite which cavses the burning sensation. It neutralises the acid and relives us from the pain. Question 2. Example: Following reaction: Question 16: Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron). An antacid tablet is taken when you suffer from acidity. (d) Nitric acid. Question 15. Copper does not reach with tamarind (imli) water. It is not affected by acids and neutral substances. Answer: 3. Alum (Phitkari) acts as a antacid. Hence copper is used to make hot water tanks and not steel (an alloy of iron). If an indicator changes colour with a base, it does not change colour with an acid. Question 11. 1.5 What happen when acid react with metal hydrogen Carbonate? Question 7. Write one use of each of the following compounds? Answer: (T/F), Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. This process is known as descaling. Answer: 1.2 What happen when acid react with metal carbonate? Some hydrated salts: Question 17. Write their properties. (b) lime stone, calcium hydroxide It is used as medicine to reduce acidity of the stomach. Answer: HCl+ NH4OH → NH4Cl + H2O. 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. Give reasons why copper is used to make hot water tanks and not steel (analloy of iron). (in) Aluminium forms oxide layer on its surface which does not further react with air. Name two acid – base indicators. When metal carbonate reacts with acids they give carbon dioxide gas. Dilute acid: A litre of a water contains about 35 grams of salts. Answer: Make turmeric paper by depositing turmeric paste on blotting paper/filter paper and drying it. Alkalies: 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. If it taste sour, it is acid. Question (iii) (iii) Copper does not react with water at any temperature, whereas iron reacts with water on heating. Ammonia is a weak alkali. What will happen if blue litmus paper is soaked in orange juice? Do yourself. Mix some water with lemon juice in a plastic cup/ tumbler/ test tube. Put a drop of distilled water on a strip of the red litmus paper with the help of a droper. Long Answer Iron do not react with hot water, but reacts with steam and forms metallic oxide and Hydrogen. No, we should not taste unknown substances. Question 12. (ii) Copper does not corrode easily. What is a neutralisation reaction? Activities Keep the mixture for some time till water becomes coloured. These acids are present in humans and plants. Log in. Question 4. Question 1. Answer: Choose the correct alternative, Question (i) Mark ‘T’ if the statement is true and ‘F’ if it is false: Question 7. Click here 👆 to get an answer to your question ️ Give reason : copper does not react with tamarid water 1. MP Board Class 10th Science Chapter 3 Additional Questions. Copper does not reach with tamarind (imli) water. Answer: Question 5. Examples: Sodium hydroxide, potassium hydroxide and calcium hydroxide. One of the mineral acid, hydrochloric acid (HCl) present in our stomach helps in digestion of food. Acitivity 4 5. Organic acid contains COOH functional group. Answer: Calcium hydroxide is used in the manufacture of bleaching powder. They are less corrosive and are used in food ingradients. The solution which turns red litmus paper blue is basic in nature. Which of the following statements are true (T) or false (F): Question 4. Answer: Organic acid are soured milk, lemon, green mangoes and karvanda are sour tasting. A more reactive metal will displace a less reactive metal from a compound. Answer: Reaction with dilute adds : They can displace hydrogen from acids and so form salts. Which acid is present in our stomach? Question 2. The acid which are prepared by dissolving in excess amount of water are known as dilute acids. Its properties are: Question 2. Answer: Add some warm water. A solution turns red litmus paper into blue. Use this solution to write the message on a sheet of white paper with a cotton bud. 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. Salt and water are produced in this process with the evolution of heat. If they are allowed to flaw into the water bodies, they are harmful for orgainsms living in water. Blue litmus turns red by – Question 4. Bases are substances which have one or more replaceable hydroxyl group (OH). Question 2. Classify the following chemicals in acids and bases: Litmus solution is extracted from lichens. 2. 4. When we blue vitriol heated it changes into white vitriol and water. The seas are great sources of salts. 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