In the following reactions,$ZnO$ is respectively acting as a/an:

Which of the following is not a $Br\o nsted$ acid?

When pure water is exposed to atmospheric $CO_2$,it absorbs the gas. What will be its $pH$?

The ionization constants of $HF$,$HCOOH$,and $HCN$ at $298 \ K$ are $6.8 \times 10^{-4}$,$1.8 \times 10^{-4}$,and $4.8 \times 10^{-9}$ respectively. Calculate the ionization constants of their corresponding conjugate bases.

Ammonia gas dissolves in water to give $NH_4OH$. In this reaction,water acts as:

Arrange the following ions in the correct order of their acidity: $(i) \, HCO_3^-, (ii) \, H_3O^+, (iii) \, HSO_4^-, (iv) \, HSO_3F$.