Which of the following statement(s) is/are correct?

Formation of  $M{g}_{\left(g\right)}^{2+}$ from Mg(g) and  $O_{\left(g\right)}^{2-}$  from O(g) are endothermic but the formation of  $MgO\left(s\right)$ from  $M{g}_{\left(g\right)}^{2+}$ and  $O_{\left(g\right)}^{2-}$  is exothermic

Reaction  $P{b}_3{O}_4+8HCl\to 3PbC{l}_2+C{l}_2+4H_{2}O$ involves both acid – base reaction  and redox reaction

When  $BC{l}_3$ gas is passed into an aq solution of NaCl, Boric acid is formed

Alkali metal hydroxides are more corrosive than alkaline earth metal hydroxides