Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest pH value-

Options

A. LiCl
B. `BaCl_2`
C. `BeCl_2`
D. `AlCl_3`

Explanation

In aqueous solution, metal cation `(M^(n+))` remains associated with water `[M(H_2O)_x]^(n+)`. The hydrated cation donates proton through the following reaction.
`[M(H_2O)_x]^(n^+) A hydrated metal cation in which the cation possesses high charge density has high ability to donate proton. In the given salts, the charge densities of the cations follow the order `Ba^(2+)