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NCERT Solutions for Class 7 Science Chapter 5 Acids, Bases and Salts
Complete exercise of Class 7 Science Chapter-5 Acids, Bases and Salts
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   • Class 7 Science Ch-5  
Class 7 NCERT Science Chapter 5 question and answers
00:00 Keywords questions and answers class 7 science chapter 5
00:21 what is acid?
00:53 what is acidic?
01:27 what is a base?
01:49 what is basic?
02:07 what is an indicator?
02:43 what is neutral?
03:16 what is neutralisation?
04:03 what is salt?
04:53 State differences between acids and bases.
05:48 Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
06:29 Name the source from which litmus solution is obtained. What is the use of this solution?
07:27 Is the distilled water acidic/basic/neutral? How would you verify it?
08:23 Describe the process of neutralisation with the help of an example.
09:57 Nitric acid turn red litmus blue. True or false
10:09 Sodium hydroxide turns blue litmus red. True or false
10:26 Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. True or false
10:45 Indicator is a substance which shows different colours in acidic and basic solutions. True or false
11:02 Tooth decay is caused by the presence of a base. True or false
11:30 Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks 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?
15:43 Explain why an antacid tablet is taken when you suffer from acidity?
16:30 Explain why Calamine solution is applied on the skin when an ant bites.
17:15 Explain why Factory waste is neutralised before disposing it into the water bodies.
18:08 Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator.
20:14 Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
20:54 Consider the following statements. Which of these statements are correct?