Question

Borax is actually made of two tetrahera and two triangular units joined together and should be written as:

$N{a}_2\left[B_4{O}_5\right(OH{)}_4].8H_{2}O$

Consider the following statements about borax.

• A. Each boron atom has four $B-O$ bonds
  
• B. Each boron atom has three $B-O$ bonds
  
• C. Two boron atoms have four $B-O$ bonds while other two have three $B-O$ bonds
  
• D. Each boron atom has one $-OH$ groups
  

Answer 1

Answer: (C), (D)

The correct options are
C Two boron atoms have four $B-O$ bonds while other two have three $B-O$ bonds
D Each boron atom has one $-OH$ groups

Structure of $\left[B_4{O}_5\right(OH{)}_4{]}^{2-}$ is shown in figure. From figure it is evident that statement 3 and 4 are correct.