Aqueous solution of borax reacts with two mol of acids. This is because of :

Options

A. Formation of 2 mol of `B(OH)_(3)` only
B. Formation of 2 mol of `[B(OH)_(4)]^(-)` only
C. Formation of 1 mol each of `B(OH)_(3)` and `[B(OH)_(4)]^(-)`
D. Formation of 2 mol each of `[B(OH)_(4)]^(-)` and `B(OH)_(3)` of which only `[B(OH)_(4)]^(-)` reacts with acid

Answer

D

Explanation

`Na_(2)B_(4)O_(7)+7H_(2)Oto2B(OH)_(3)+2Na[B(OH)_(4)]`
`B(OH)_(3) "or" H_(3)BO_(3)` is an acid and does not react wih acid.
Hence `Na[B(OH)_(4)]` reacts with acid.