Hydrochloric acid is used for removing the deposits from inside the boilers. Question 2. Question 9. (d) Baking soda. Distinguish clearly between the following terms by giving suitable examples: Question 5. Join now. They are known as organic acids. If the colour changes to red, acid is present. Ans - Copper do not react with hot water, cold water and steam. Which is the common name of sodium bicarbonate – Iron do not react with hot water, but reacts with steam and forms metallic oxide and Hydrogen. (c) Aluminium forms oxide layer on its surface which does not further react with air. 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Question 15. Answer: The reactivity series allows us to predict how metals will react. Organic acid contains COOH functional group. But, unfortunately, these are not labelled. But too mcuh of acid in the stomach causes indigestion. 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. Name two acid – base indicators. Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron) is not. MP Board Class 10th Science Chapter 3 Additional Questions. When metal carbonate reacts with acids they give carbon dioxide gas. Question 10. ा तो चरित्र निर्माण प्रश्न उत्तर​, Clear transparent water is always fit for drinking. Question 11. It the sample of drink turns red litmus blue, it is basic. Answer: (i) Copper is a better conductor of heat than steel. Answer: These acids are present in humans and plants. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Basic. Prepare red cabbage juice by boiling a piece of red cabbage in water. 1. Vessels made from glass or cermics are considered safe for strong acids. Answer: It is used for the manufacture of fertilizers. Question (vi) Bases are the compound which have one or more hydroxhyl group (OH) in their molecule. Acids are substances which contain one or more replaceable hydrogen atoms. H + ions are produced when HCl gas comes into contact with water. Is dry hydrogen chloride gas an acid? Give reasons why copper is used to make hot water tanks and not steel (analloy of iron). So, first we will identify the base. For example, HCl, HNO3, H2SO4 (Hydrochloric acid, Nitric acid, Sulphuric acid). What is a neutralisation reaction? Answer: Activity 3 We will sprinkle some base on the table to neutralise the effect of the acid. Examples: Sodium hydroxide, potassium hydroxide and calcium hydroxide. However, iron reacts with steam. Copper does not react with cold water, hot water, or steam. The acid which are prepared by dissolving in excess amount of water are known as dilute acids. Differentiate between bases and alkalies by giving suitable examples of each? Zn + 2HCl(dil.) (b) lime stone, calcium hydroxide Question 9. Reaction with dilute adds : They can displace hydrogen from acids and so form salts. Answer: (a) Acetic acid Put a drop of soap solution on the strip of turmeric paper. (d) Qattstic potash. (b) Alkali It it turns blue litmus red, it is acidic. Take a drop of the dilute solution of the substance on the tips of your tongue. Answer: Question 10. Answer: 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. These are solid in the form of tablets called antacids. Containers/ vessels made from which material are safe to store acids? Answer: The gas which escapes out from many aerated soft drinks is ………….. Samples of four metals A,B, C and D were taken and added to the following solutions one by one. Alum (Phitkari) acts as a antacid. Answer: (ii) Tamarind contains acid which reacts with basic copper carbonate and product gets dissolved and removed from copper vessel. However, in the presence of water, copper is bound to tarnish more quickly. (d) Nitric acid. A litre of a water contains about 35 grams of salts. (b) Sodium metal is highly reactive. In fact you get a brown precipitate of copper and a blue solution of copper(II) sulphate because of the disproportionation reaction. H2SO4 + 2NH4OH → (NH ) SO4 + 2H2O Ammonia is a weak alkali. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Bases: The citric acid present in the lemon or tamarind neutralises the basis copper carbonate and dissolves the layer. abishekcps abishekcps 31.07.2020 Chemistry Primary School +5 pts. Answer: So the factory wastes are neutralised by adding basic substances. Calamine solution is applied on the skin when an ant bites. (T/F), Indicator is a substance which shows different colours in acidic and basic solutions. Is the distilled water acidic/basic/neutral? Copper does not reach with tamarind (imli) water. Answer: For example: Answer: Question 7. Put one piece of red litmus paper into each of these solutions. Sodium hydroxide turns blue litmus red. What are acid salts? (b) SO2 Click here 👆 to get an answer to your question ️ Give reason : copper does not react with tamarid water 1. The seas are great sources of salts. (in) Aluminium forms oxide layer on its surface which does not further react with air. Question 1. (a) Sour in taste Examples: Lactic acid, Citric acid, Vinegar, Formic acid. Copper does not reach with tamarind (imli) water. Question 13. Rub a slice of fresh beet root over the message. Dorji has a few bottles of soft drink in his restaurant. (T/F), Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (d) None of the above. The substance which turns red litmus paper blue is known as alkalies. Question 4. Ant injects an acid (i.e., formic acid) during bite which cavses the burning sensation. That bottle which turns red litmus blue contains sodium hydroxide (base). 1.1 What happen when acid react with metal? (iii) Copper does not react with water at any temperature, whereas iron reacts with water … I am not getting the same result when using solid baking soda on dry litmus paper. 5. Answer: How would you verify it? (ii) Copper does not corrode easily. Question (iv) Sulphuric acid is c.’led ‘King of chemicals’. 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. Factory wastes contain both acidic and basic substances. All the acids react with metals. is used for white – washing in house. Answer: Answer: Examples: NaOH, Ca(OH)2, KOH etc. (d) Nitric acid. One customer wants acidic drind, another wants basic and third one wants neutral drink. State one characteristic property of all acids. Question 3. Why does colour of blue vitriol change when heated? Such acids are found in animals and plant materials. (T/F), Tooth decay is caused by the presence of a base. Answer: Answer: (i) Copper is a better conductor of heat than steel. To relieve indigestion, we take an antacid such as milk of magnesia, which contains magnesium hydroxide. So, the acids are not stored in metal containers. He has to serve tire drinks on the demand of customers. Question 1. Slit across lengthwise and remove seeds. Question 4. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. (in) Aluminium forms oxide layer on its surface which does not further react with air. Water filters can also be used to reduce copper levels in home drinking water supplies. 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? The acids which are prepared by dissolving in water, are known as concentrated acid. Bases are bitter in taste and slippry in touch. (a) Acid These substances are neither acidic nor basic. This causes acidity. Explain. Copper does not react with cold water, hot water, or steam. water is happily married and so wont react with copper well, because its happy as it is. To acid not stored in metal containers result when using solid baking soda and beet root acids are strong.! Goldsmiths for cleaning gold and silver ornaments has to serve tire drinks on strip... Wood pulp and Organic chemicals oxygen by it 's self, reacts steam... 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