In which form do $H^{+}$ (hydrogen) ions exist in water?

Which of the following relations is correct for a basic aqueous solution?

If $1$ mole of salt is dissolved in $2$ liters of salt solution,what is the concentration of the solution (in $;M$)?

Identify $A, B$ and $C$ in the following reactions and write the chemical name of $A, B$ and $C$.
$(i)$ $HNO_{3} + NaOH \rightarrow \underline{A} + H_{2}O$
$(ii)$ $\underline{B} + Ca(OH)_{2} \rightarrow CaSO_{4} + 2H_{2}O$
$(iii)$ $HCl + \underline{C} \rightarrow KCl + H_{2}O$

Which substance is added to the soil to neutralize acidic soil?

What happens when metal oxide reacts with water?