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Boric acid B(OH)(3) is weak monobasic ac...

Boric acid `B(OH)_(3)` is weak monobasic acid reacts with alkali to form borates. The most common borate of boric acid is borax represented as `Na_(2)(B_(4)O_(5)(OH)_(4)).8H_(2)O` which is made up of two tetrahedral and two triangular units. On dissolution in water, these tetrahedral and triangular units are sepeated. Borax is useful primary standard for titra tion against acids.
Oxidation state of boron atom in borax is / are

A

`+3` only

B

three atoms +3 and one atom +2

C

`+2` only

D

two atoms +3 and two atoms +4

Text Solution

Verified by Experts

The correct Answer is:
A
`Na_(2)B_(4)O_(7) hArr 2+4x-14=0`
`4x = 12 implies x =+3`
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