Borax is actually made of two tetrahedral and tetrahedral and two triangular units joined together and should be written as `Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O`
Consider following statements about borax:
(1) Each boron atom has four `B - O` bonds
(2) Each boron atom has three `B - O` bonds
(3) Two boron atoms have four `B - O` bonds while other two have three `B - O` bonds
(4) Each boron atom has one `-OH` group
Select correct statement(s) :

Options

A. `1,2`
B. `2,3`
C. `3,4`
D. `1,3`

Answer

C