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Find the number of sigma bond and lone p...

Find the number of `sigma` bond and lone pair respectively in hydrated borax.

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The correct Answer is:
34,34
`Na_(2)B_(4)O_(7)*10H_(2)O`

`sigma-"bond"rarrunderset(8H_(2)O)ubrace(2xx8)+underset(sp^(3)B)ubrace(4xx2)+underset(sp^(2)B)ubrace(3xx2)+underset(O-H)ubrace(1xx4)=34`
`l.p.rArrunderset('O')ubrace(17)xx2=34`
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