Q 1273101046.     Borax is actually made of two tetrahedra and two tetrahedra and two triangular units joined together and should be written as : `Na_2[B_4 O_5 (OH)_4] * 8H_2O`

Consider the following statements (s) :
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


A

`a , b`

B

`b, c`

C

`c, d`

D

`a, c`

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