Read the following structural aspects of borax and answer the questions given at the end. “Borax is actually made of two 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 :
I. Each boron atom has four `B-O` bonds
II. Each born atom has three `B-O` bonds
III. Two boron atoms have four `B-O` bond while other two have three `B-O` bonds
IV. Each boron atom has one `-OH` group
Select correct statement(s) :

Options

A. `A,B`
B. `B,C`
C. `C,D`
D. `A,C`

Answer

C