# NCERT Solutions for Class 7 Science Chapter 5

## Acids, Bases and Salts Class 7

### Exercise : Solutions of Questions on Page Number : 56

Q1 :

State the differences between acids and bases.

 - 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.

Q2 :

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

Ammonia is basic in nature as it turns the colour of red litmus paper to blue.

Q3 :

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

Q4 :

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

Q5 :

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

Q6 :

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 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)

Q7 :

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?

Q8 :

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.

Q9 :

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.

Q10 :

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

Q11 :

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 d (iii) b and c (iv) only d