Question

which of these is not a strong base? ba(oh)₂ sr(oh)₂ lioh nh₃

Explanation:

Strong bases are typically hydroxides of Group 1 (alkali metals) and Group 2 (alkaline earth metals) elements, as they dissociate completely in water. \( \text{Ba(OH)}_2 \) (barium hydroxide, Group 2), \( \text{Sr(OH)}_2 \) (strontium hydroxide, Group 2), and \( \text{LiOH} \) (lithium hydroxide, Group 1) are strong bases. \( \text{NH}_3 \) (ammonia) is a weak base because it does not dissociate completely; it accepts protons from water to form \( \text{NH}_4^+ \) and \( \text{OH}^- \) ions, but the process is reversible and only a small fraction of \( \text{NH}_3 \) molecules react.

Answer:

D. \( \text{NH}_3 \)