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

How is an aqueous solution with $pH$ $12$ compared to an aqueous solution with $pH$ $9$?

$(a)$ Write the chemical formula of hydrated copper sulphate and anhydrous copper sulphate. Giving an activity,illustrate how these two are interconvertible.
$(b)$ Write the chemical names and formulae of Plaster of Paris and gypsum.

In $H_{3}O^{+}$,there is a coordinate covalent bond between $......$ and $......$.

The Bronsted-Lowry acid-base theory was based on which of the following?

Which of the following is not an oxide of metal?