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NCERT Solutions for Class 7 Science Chapter 5 Acids, Bases And Salts

NCERT Solution For Class 7 Science

Acids, Bases And Salts Here is the CBSE Science Chapter 5 for Class 7 students. Summary and detailed explanation of the lesson, including the definitions of difficult words. All of the exercises and questions and answers from the lesson's back end have been completed. NCERT Solutions for Class 7 Science Acids, Bases And Salts Chapter 5 NCERT Solutions for Class 7 Science Acids, Bases And Salts Chapter 5 The following is a summary in Hindi and English for the academic year 2023-24. You can save these solutions to your computer or use the Class 7 Science.

Question 1

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State the differences between acids and bases.

Solution

–	Acids	Bases
(i)	These are sour to taste.	These are bitter to taste.
(ii)	Acids turn blue litmus red.	Bases do not change the colour of blue litmus.
(iii)	Acids do not change the colour of red litmus.	Bases turn red litmus blue.
(iv)	With china rose indicator, these give dark pink colour.	Bases give green colour with china rose indicator.
(v)	Acids do not change the colour of turmeric indicator.	Bases turn the colour of turmeric indicator to red.

Question 2

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Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?

Easy

Question 3

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Name the source from which litmus solution is obtained. What is the use of this solution?

Easy

Question 4

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Is the distilled water acidic/basic/neutral? How would you verify it?C

Easy

Question 5

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Describe the process of neutralization with the help of an example.

Easy

Question 6

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Mark ‘T’ if the statement is true and ‘F’ if it is false:

A.
Nitric acid turns red litmus blue

B.
Sodium hydroxide turns blue litmus red.

C.
Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water.

D.
Indicator is a substance which shows different colours in acidic and basic solutions.

E.
ooth decay is caused by the presence of a base.

Easy

Question 7

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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?

Easy

Question 8

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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.
(c) Factory waste is neutralised before disposing it into the water bodies.

Easy

Question 9

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Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and the third is a sugar solution. How will you identify them? You have only turmeric indicator.

Easy

Question 10

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Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.

Easy

Question 11

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Consider the following statements:
(a) Both acids and bases change colour of all indicators.
(b) If an indicator gives a colour change with an acid, it does not give a change with a base.
(c) If an indicator changes colour with a base, it does not change colour with an acid.
(d) Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?

A.
All four

B.
a and d

C.
b and c

D.
only d

Easy

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