Acids, Bases and Salts Class 7 Science NCERT
Acids, Bases and Salts Class 7 Science NCERT
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35 mins
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Aug 2021
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What you will learn
Q. 1. State differences between acids and bases?
Q.2. Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
Q.4. Is the distilled water acidic/basic/neutral? How would you verify it?
Q.5 Describe the process of neutralisation with the help of an example.
6. Mark ‘T’ if the statement is true and ‘F’ if it is false: (i) Nitric acid turn red litmus blue. (T/F) (ii) Sodium hydroxide turns blue litmus red. (T/F)
6. Mark ‘T’ if the statement is true and ‘F’ if it is false: (iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T/F)
6. Mark ‘T’ if the statement is true and ‘F’ if it is false: (iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F)
6. Mark ‘T’ if the statement is true and ‘F’ if it is false: (v) Tooth decay is caused by the presence of a base. (T/F)
Q.8. Explain why: (a) An antacid tablet is taken when you suffer from acidity. (b) Calamine solution is applied on the skin when an ant bites.
Q.8. Explain why: (c) Factory waste is neutralised before disposing it into the water bodies.
Q. 9. Three liquids are given to you. Liquids are hydrochloric acid, sodium hydroxide and sugar solution. How will you identify them? You have only turmeric.
Q. 10. Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
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udemy ID
16/08/2021
course created date
19/08/2021
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