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P. 71 Oral Questions For Formative Assessment (Living Science)
1. acetic acid and citric acid 2. Acids are corrosive in nature. Strong acids can corrode even metals like iron and aluminium. Hence, acids are not stored in metal containers. 3. litmus paper and methyl orange; acid-base indicators 4. neutralization reaction, salt 5. Organic acids are naturally occurring acids that are present in animal and plant products. They are normally weak acids. Hydrochloric acid, sulphuric acid and nitric acid are known as mineral acids. They are normally strong acids. P. 72 Oral Questions For Formative Assessment 1. Bases which are soluble in water are called alkalis. But some bases are not soluble in water, so they are not alkalis. That is why all alkalis are bases but all bases are not alkalis. 2. I will not recommend that quicklime or slaked lime be added to the soil to neutralize the acid present in it. 3. sodium hydroxide (NaOH) 4. hydrochloric acid (HCI), magnesium hydroxide is used as an an acid to neutralize the excess add in the stomach P. 74 Oral Questions For Formative Assessment 1. If we replace hydrogen of an acid with a metal, a salt is formed. 2. a salt and water 3. a. nitric acid b. carbonic acid c. hydrochloric acid d. sulphuric acid 4. a salt; sodium bicarbonate (NaHCO3) Page 74 For Formative and Summative Assessment A. 1. d 2.a 3.c 4. d 5. c 6. a 7. d 8. d 9. b B. 1. sodium chloride 2. an acid 3. red 4. false 5. nitric acid 6. lactic 7. carbon dioxide 8. neutralization 9. sulphuric add 10. alkali 11. ammonium hydroxide 12. a base 13. pale yellow 14. caustic soda 15. magnesium hydroxide 16. true 17. blue C. 1. The substance which can be used to test if a given substance is acidic or basic in nature is known as an acid-base indicatdr, for example, methyl orange. 2. lemon, antacid, common salt 3. When dilute sulphuric acid is added to zinc, hydrogen gas is produced along with zinc sulphate. 4. Dilute acids react with carbonates such as calcium carbonate (CaCO3) to form salt and carbon dioxide gas. 5. Examples of strong acids: (I) Nitric acid (ii) Sulphuric acid Examples of weak acids: (i) Lactic acid (ii) Acetic acid 6. Ant bite injects formic acid inside the skin, and thus skin irritates for some time. To get relief, a base (baking soda) is applied to neutralize the acid. The irritation ends with forming salt and water and provides relief. 7th Acids bases and Salt Living science solution Download File For Formative and Summative Assessment
A. 1. b 2. a 3. d 4. b 5.d 6. a 7. c 8. b B. 1. Biodiversity means the variety of plants, animals and microorganisms generally found in an area. 2. `Flora' refers to plants. 3. Yes - I agree 4. False 5. Erosion 6. Overgrazing 7. True 8. renewable 9. extinct 10. forest 11.True 12. trees 13. endemic 14. endangered C.1. Biodiversity is the variety of plants, animals and microorganisms generally found in an area. 2. Flora: Species of all plants found in a particular area is known as flora of that area. Fauna: Species of all animals found in a particular area is known as fauna of that area. 3. Cutting down forests and using the land for other purposes is known as deforestation. 4. Some animals cannot adjust to the environmental changes and begin to die. These animal species become endangered as their population becomes very small. 5. A biosphere reserve is a large protected area set aside for conservation of wildlife, plant, animal and microorganism resources, and the traditional life of the tribals living in that area. 6. Endemic species are those species of plants and animals that are found exclusively in a particular area and are not naturally found anywhere else. For example, the Indian giant squirrel and flying squirrel are endemic to the Pachmarhi Biosphere Reserve area. 7. IUCN prepared Red Data Book to highlight those animals who are threatened with extinction, with the aim of promoting their conservation. Those threatened with extinction. 8th Conservation of plants_animal science solution Download File |
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