$L{i_2}O$

$N{a_2}{O_2}$

$K{O_2}$

BeO

${\rm{B}}{{\rm{e}}^{2 + }} > M{{\rm{g}}^{2 + }} > C{{\rm{a}}^{2 + }} > S{{\rm{r}}^{2 + }} > B{{\rm{a}}^{2 + }}$

${\rm{B}}{{\rm{a}}^{2 + }} > B{{\rm{e}}^{2 + }} > C{{\rm{a}}^{2 + }} > M{{\rm{g}}^{2 + }} > S{{\rm{r}}^{2 + }}$

${\rm{M}}{{\rm{g}}^{2 + }} > B{{\rm{e}}^{2 + }} > B{{\rm{a}}^{2 + }} > C{{\rm{a}}^{2 + }} > S{{\rm{r}}^{2 + }}$

None of the above

In a current of dry ${\rm{HCl}}$ gas

With carbon

Until it fuses

With lime

Sodium atoms

Solvated electrons

${\rm{NaOH}}$

Sodium amide

${\rm{MgC}}{{\rm{O}}_3}$

${\rm{CaC}}{{\rm{O}}_3}$

${\rm{SrC}}{{\rm{O}}_3}$

${\rm{BaC}}{{\rm{O}}_3}$

${\rm{Mg}}{\left( {{\rm{OH}}} \right)_2}$

${\rm{Ca}}{\left( {{\rm{OH}}} \right)_2}$

${\rm{Ba}}{\left( {{\rm{OH}}} \right)_2}$

None of these

${\rm{CaS}}{{\rm{O}}_4}$

Orthorhombic ${\rm{CaS}}{{\rm{O}}_4}.2{{\rm{H}}_2}{\rm{O}}$

${\rm{CaS}}{{\rm{O}}_4}{\rm{.}}{{\rm{H}}_2}{\rm{O}}$

Monoclinic ${\rm{CaS}}{{\rm{O}}_4}.2{{\rm{H}}_2}{\rm{O}}$

${\rm{Be}}$ can form complexes due to its very small size

${\rm{Mg}}$ cannot form complexes

${\rm{Mg}}$ burns in air releasing dazzling light rich in UV rays

${\rm{CaC}}{{\rm{l}}_2}.6{{\rm{H}}_2}{\rm{O}}$ when mixed with ice gives freezing mixture

${\rm{Be}}$

${\rm{Mg}}$

${\rm{Sr}}$

${\rm{Ca}}$

${\rm{NaOH}}$

${\rm{Ca}}{\left( {{\rm{OH}}} \right)_2}$

${\rm{KOH}}$

${\rm{Ba}}{\left( {{\rm{OH}}} \right)_2}$

${\rm{I}} < II < III < IV$

${\rm{IV}} < II < III < I$

${\rm{IV}} < II < I < III$

${\rm{II}} < IV < III < I$