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

NCERT Science

Book: NCERT Science

Chapter: 5. Acids, Bases and Salts

Subject: Chemistry - Class 7^th

Q. No. 10 of Exercise

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10

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

The solution could be basic or neutral because blue litmus paper does not change its colour in basic as well as neutral solution. If solution is acidic, if will change blue litmus paper to red.

10

1

State differences between acids and bases.

2

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

3

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

4

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

5

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

6

Mark “T” if the statement is true and “F” if it is false:
i. Nitric acid turns red litmus blue. (T/F)

ii. Sodium hydroxide turns blue litmus red. (T/F)

iii. Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water. (T/F)

iv. Indicator is a stub stance which shows different colours in acidic and basic solutions. (T/F)

v. Tooth decay is caused by the presence of a base. (T/F)

7

Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labeled. 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?

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.

c. Factory waste is neutralized before disposing it into the water bodies.

9

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

10

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

11

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?

i. All four ii. a and b

iii. b and c iv. Only d