AIEEE 2010 PYQ Mock Test

The main product of the following reaction is
:

Three reactions involving ${\text{H}}_2{\text{PO}}_4^{-}$ are given below:(i) ${\text{H}}_3{\text{PO}}_4+{\text{H}}_2\text{O}\to {\text{H}}_3{\text{O}}^{+}+{\text{H}}_2{\text{PO}}_4^{-}$ (ii) ${\text{H}}_2{\text{PO}}_4^{-}+{\text{H}}_2\text{O}\to {\text{HPO}}_4^{2-}+{\text{H}}_3{\text{O}}^{+}$ (iii) ${\text{H}}_2{\text{PO}}_4^{-}+{\text{OH}}^{-}\to {\text{H}}_3{\text{PO}}_4+{\text{O}}^{2-}$ (Inconsistent stoichiometry)In which of the above does ${\text{H}}_2{\text{PO}}_4^{-}$ act as an acid?

In aqueous solution the ionization constants for carbonic acid are $K_1=4.2\times 10^{-7}$ and $K_2=4.8\times 10^{-11}$. Select the correct statement for a saturated $0.034\text{M}$ solution of the carbonic acid.

The edge length of a face centered cubic cell of an ionic substance is $508\text{pm}$. If the radius of the cation is $110\text{pm}$, the radius of the anion is:

The correct order of increasing basicity of the given conjugate bases ($\text{R}={\text{CH}}_3$) is: