Question

Which of the following is strongest base?

• A. $Be{\left(OH\right)}_2$
• B. $Mg{\left(OH\right)}_2$
• C. $Al{\left(OH\right)}_3$
• D. $Si{\left(OH\right)}_4$

Answer 1

The correct option is B $Mg{\left(OH\right)}_2$

• $Mg,Si,Al$ belongs to the same period and as we go along the period the the size of the atom decreases and hence tendency to loose electrons decreases.
• $Mg,Be$ belongs to the same group. As we move from $Be$ to $Mg$ the size increases as a result the tendency to loose electron increases.
• Thus the above two factors determine $Mg(OH{)}_2$ is strongest base among the given options.