Question 2.
\nAmmonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
\nAnswer:
\nBases turn red litmus blue, so nature of ammonia is basic.<\/p>\n
Question 3.
\nName the source from which litmus solution is obtained. What is the use of this solution?
\nAnswer:
\nLitmus is a natural indicator. It is extracted from lichens. It has a purple colour in distilled water. It is available in the form of a solution or in the form of strips of paper. It is available as red and blue litmus paper. It is used to test the nature of a substance. Acid turns blue litmus solution red and base turns red litmus solution blue.<\/p>\n
![\"KSEEB](\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/10\/KSEEB-Solutions-for-Class-7-Science-Chapter-5-Acids-Bases-and-Salts-1.png\")
<\/p>\n
Question 4.
\nIs the distilled water acidic\/basic\/ neutral? How would you verify it?
\nAnswer:
\nDistilled water is neutral in nature. The same can be verified by using red and blue litmus papers.
\nNeither will show a colour change with distilled water. This proves that distilled water is neutral.<\/p>\n
Question 5. Question 6. (iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T\/F) (iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T\/F) (v) Tooth decay is caused by the presence of a base. (T\/F) Question 7. Question 8. (b) Calamine solution is applied on the skin when an ant bites. (c) Factory waste is neutralised before disposing it into the water bodies. Question 9. Question 10. Question 11. Question 1. Question 2. Question 3. Question 4. Question 5. Question 6. Question 7. II. Fill in the blanks :<\/span><\/p>\n Students can Download Chapter 5 Acids, Bases and Salts Questions and Answers, Notes Pdf, KSEEB Solutions for Class 7 Science, Karnataka State Board Solutions help you to revise complete Syllabus and score more marks in your examinations. Karnataka State Syllabus Class 7 Science Chapter 5 Acids, Bases and Salts Class 7 Science Acids, Bases and …<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[84],"tags":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/12550"}],"collection":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/comments?post=12550"}],"version-history":[{"count":0,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/12550\/revisions"}],"wp:attachment":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/media?parent=12550"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/categories?post=12550"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/tags?post=12550"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nDescribe the process of neutralization with the help of an example.
\nAnswer:
\nThe reaction between an acid and a base is known as neutrilization reaction. In this reaction, both acid and base cancel each other\u2019s effect.
\nThe Neuralization reaction results in the formation of salt and water. During this reaction, energy in the form of heat is evolved.
\nAcid + Base \u279d Salt + water + Heat
\nFor example, when sodium hydroxide (NaOH) is added, to hydrochlaric acid (HCl), sodium chloride. (Nacl) and water (H2<\/sub>O) are obtained.
\nNaOH + HCL \u279d Nacl + H2<\/sub>O + Water.<\/p>\n
\nMark \u2018T\u2019 if the statement is true and \u2018F\u2019 if it is false:
\n(i) Nitric acid turn red litmus blue. (T\/F)
\nAnswer:
\nFalse
\n(ii) Sodium hydroxide turns blue litmus red. (T\/F)
\nAnswer:
\nFalse<\/p>\n
\nAnswer:
\nTrue<\/p>\n
\nAnswer:
\nTrue<\/p>\n
\nAnswer:
\nFalse<\/p>\n
\nDorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the
\ndrinks on the demand of customers. One customer wants acidic drink, another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?
\nAnswer:
\nSince the drikts are edible, Dorji can take the decision by tasting the drinks. Acidic drinks will be sour to taste where as basic drinks will be bitter to taste and neutral drinks will have no taste. He can also use litmus paper to identify the acid, base and neutral drink, by just dropping few drops of drink on litmus paper and can take the decision according to the following :<\/p>\n\n
\nExplain why:
\n(a) An antacid tablet is taken when you suffer from acidity.
\nAnswer:
\nDue to release of excess of hydrochloric acid, we suffer from acidity. An antacid tablet consists of a base like milk of Magnesia (magnesium hydroxide). It neutralizes the effect of excessive acid and brings relief.<\/p>\n
\nAnswer:
\nThe sting of an ant contains formix acid which caues irrition on the skin. Calamine solution contains, zinc carbonation which is a base. Calamine solution neutralizes the acid effect of the ant bite when applied on the skin.<\/p>\n
\nAnswer:
\nThe wastes of many factories contain acids. If they are allowed to flow into the water bodies, the acids will kill aquatic organisms, The factory wastes are, therefore, neutralized by adding basic substances.<\/p>\n
\nThree liquids are given to you. Once is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator
\nAnswer:
\nTurmeric is yellow in colour. When a base is added to it, the solution turns into red colour. However turmeric remains yellow when an acid or neutral solution is added to it. We shall perform the following steps to identify neutral.<\/p>\n\n
\nBlue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
\nAnswer:
\nA solution which does not change the colour of blue litmus paper can be either basic or neutral in nature. The nature of the solution can be obtained by adding a few drops of it on a red litmus paper. If the colour of the red litmus changes to blue, then the solution is basic in nature. If no colour change is observed, then the solution is neutral in nature.<\/p>\n
\nConsider the following statements:
\na. Both acids and bases change colour of all indicators.
\nb. If an indicator gives a colour change with an acid, it does not give a change with a base.
\nc. If an indicator changes colour with a base, it does not change colour with an acid.
\nd. Change of colour in an acid and a base depends on the type of the indicator.
\nWhich of these statements are correct?
\ni. All four
\nii. a and d
\niii. b, c, and d
\niv. only d
\nAnswer:
\niv. only d<\/p>\nClass 7 Science Acids, Bases and Salts Additional Important Questions and Answers<\/h3>\n
\nWhat are the indicators ?
\nAnswer:
\nSome special Substances which are used to test whether a substance is acidic or basic very easily are called indicators.<\/p>\n
\nName some natural indicators.
\nAnswer:
\nTurmeric, litmus, china rose petals etc., are some of the natural indicators.<\/p>\n
\nDefine neutral Solutions.
\nAnswer:
\nThe solutions which do not change the colour of either red or blue litmus are known as
\nNeutral Solutions: These solutions are neither acidic nor basic in nature.<\/p>\n
\nWhat is phenolphthalein ?
\nAnswer:
\nPhenolphthalein is one of the chemical indicators. If the solution is acidic the phenolphthalein is colourless, when the solution is basic it gives pink color.<\/p>\n
\nWhere do we see neutrolisation in everyday life?
\nAnswer:
\nWe can see neutralisation in everyday life are<\/p>\n\n
\nDefine Neutralisation. Give example.
\nAnswer:
\nThe reaction between an acid and a base is known as neutralisation.
\nHydrochloric acid + Sodium Hydroxide } \u279d Sodium chloride + water.
\nHCl + NaOH \u279d NaCl + H2<\/sub>O.<\/p>\n
\nWrite a table of acids and bases in which it obtains.
\n![\"KSEEB](\"https:\/\/kseebsolutions.guru\/wp-content\/uploads\/2020\/10\/KSEEB-Solutions-for-Class-7-Science-Chapter-5-Acids-Bases-and-Salts-2.png\")
<\/p>\n\n