Which of the following happens when NH_4 OH is added gradually to the solution containing 1 M A^2+ and 1 M B^3+ ions? Given: K_sp [ A ( OH )_2]=9 ×…

Which of the following happens when $\displaystyle \mathrm{NH}_4 \mathrm{OH}$ is added gradually to the solution containing $\displaystyle 1$ M $\displaystyle \mathrm{A}^{2+}$ and $\displaystyle 1 \mathrm{M} \mathrm{~B}^{3+}$ ions? Given : $\displaystyle \mathrm{K}_{\mathrm{sp}}\left[\mathrm{A}(\mathrm{OH})_2\right]=9 \times 10^{-10}$ and $\displaystyle \mathrm{K}_{\mathrm{sp}}\left[\mathrm{B}(\mathrm{OH})_3\right]=27 \times 10^{-18}$ at $\displaystyle 298$ K .