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How many of the following have sp^(3) hy...

How many of the following have `sp^(3)` hydridisation around the central atom ?
(a) `H_(2)O`, (b) `CH_(3)`, (c) `BCl_(3)`, (d) `BF_(4)^(-)`, (e) `BeCl_(2)(g)`
(f) `PCl_(4)^(+)`, (g) `XeF_(2)`, (h) `CO_(2)`, (i) `NH_(4)^(+)`, (j) `PCl_(3)`

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The correct Answer is:
6
`{:((a)H_(2)O,(b)CH_(4),(d)BF_(4)^(-)),((f)PCl_(4)^(+),(i)NH_(4)^(+),(i)PCl_(3)):}`
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