F$.$ Short answer questions

What are strong and weak acids? Give two examples of acids and bases each.

Why do we say that acids are corrosive?

Describe how salts are formed.

What are natural indicators?

What happens during the following reactions?

a$.$ when an acid reacts with a metal

b$.$ when an acid reacts with carbonates

State two properties of bases.

What should we apply to the skin in case of a bee sting? Why?

Name the base mixed with the acid in a fire extinguisher. Which is the gas produced as a result of the reaction between the two?

G$.$ Long answer questions

Write a note on different types of acids.

What are weak and strong acids? Explain with some examples.

What are the different types of indicators used to check the acidic or basic nature of a substance?

Give six uses of neutralisation reactions in our everyday life.

THINK AND ANSWER

A white shirt with a yellow stain of curry is washed using soap. When the soap is applied on the stain, the stain turns red and works like an indicator.

a$.$ Name the indicator present in the curry.

b$.$ What do you think is the nature of the soap as it turned the yellow stain red?

How is the strength of an acid or base related to its concentration?

Why is it advised to have meals on time?

DISCUSS

Do you think the acidic or the basic nature of soil is of any use for the growth of plants? Why?

In our stomach, hydrochloric acid is released which helps to digest food and also kill microorganisms present in it$,$ if any. But, in case of toothpastes, we use a base so that no microbe can grow in our mouth. Why don't we use an acid in the toothpastes instead of a base?