Among `CaH_(2),BeH_(2),BaH_(2),` the order of ionic character is

Options

A. `BeH_2 lt CaH_2 lt BaH_2`
B. `CaH_2 lt BeH_2 lt BaH_2`
C. `BeH_2 lt BaH_2 lt CaH_2`
D. `BaH_2 lt BeH_2 lt CaH_2`

Answer

A

Explanation

Smaller the size of cations , more will be its polarising power and larger will be its covalent character . Hence , `BeH_2` is least ionic and ionic character increases as :
`BeH_2 lt CaH_2 lt BaH_2`