Select the correct statements:
A. pH of `NaHCO_(3)` solution can be given by `pK_(H_(2)CO_(3))+pK_(HCO_(3)^(-))//2`
B. `AI^(3+)` ion is amphoteric
C. `K_(SP)` values of metal nitrates are very-very high
D. Liquid `SO_(2)` is aprotic solvent
`Na_((aq.))^(+)` is conjugate base of `NaOH_((aq.))`
