1.

Total number of species among following which can use any one t_(2g) d-orbital in back bondin. H_(4)SiO_(4), H_(2)NBF_(2), O(SiH_(3))_(2), CCl_(2), N(SiH_(3))_(2), (NB)_(x), R_(3)PO, P_(4)O_(10), CCl_(3)^(-)

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ANSWER :`6`


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