In the tetranuclear unit of borax $[B_{4} O_{5} (O H)_{4}]^{2 -}$ , the number of B – O – B bridges formed between $s p^{3}$ boron & $s p^{2}$ boron is ‘x’ and the number B-O-B bridges formed between $s p^{3}$ boron & $s p^{3}$ boron is ‘y’.
Then (x – y) is___

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Solution

$N o . o f B_{s p^{3}} - 0 - B_{s p^{2}} b r i d g e s = 4 (x)$
No. of $B_{s p^{3}} - 0 - B_{s p^{2}}$ bridges = 1 (y)
(x – y) = 3

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