According to the Bronsted-Lowry acid-base theory,the substance which donates a proton $(H^+)$ to another substance is called ............

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

$(a)$ Identify the acid and the base whose combination forms the common salt that you use in your food. Write its formula and chemical name of this salt. Name the source from where it is obtained.
$(b)$ What is rock salt? Mention its colour and the reason due to which it has this colour.
$(c)$ What happens when electricity is passed through brine? Write the chemical equation for it.

$(a)$ $A$ salt is produced by the reaction between an acid and a base. Identify the acid and the base from which the following salts have been formed:
$(i)$ $Na_{2}SO_{4}$
$(ii)$ $NH_{4}Cl$
$(iii)$ $KNO_{3}$
$(iv)$ $NaCl$

What range of $pH$ is considered perfect for a fertile land?

Which of the following substances enters our body when a red ant bites us?