$(a)$ Give the chemical names of acids present in:
$(i)$ ants
$(ii)$ lemon
$(iii)$ milk
$(iv)$ tomato

What is a universal indicator? State the purpose for which this indicator is used.

Who proposed the acid-base theory of ionization?

State the chemical property in each of the following cases,on which the following uses of baking soda are based:
$(a)$ Applied on an ant stung area.
$(b)$ As a constituent of baking powder.
$(c)$ In soda-acid fire extinguisher.

Name the acid present in ant sting and give its chemical formula. Also,suggest a common method to get relief from the discomfort caused by the ant sting.

In a basic aqueous solution,if the concentration of $[OH^-]$ decreases,what happens to the $pH$?