How does litmus indicator work?

Give one use of sulphuric acid.

Give one use of hydrochloric acid.

Give one use of nitric acid.

Why should factory wastes be neutralised before discharging them into water bodies? Explain.

Annie is playing in her garden with her friend, Ishrat. Suddenly, a bee bites Ishrat. Annie immediately brings baking soda and rubs it on the stung area.
(a) Why does Annie apply baking soda?
(b) What value can you learn from Annie? 

What is a neutralisation reaction?

What should be added to the soil when it is (i) too acidic and (ii) too basic?

What are organic acids?