1.

The hybridization of the central atom will change when `:`A. `NH_(3)` combines with `H^(+)`B. `H_(3)BO_(3)` combines with `OH^(-)`C. `NH_(3_` forms `NH_(2)^(-)`D. `H_(2)O` combines with `H^(+)`

Answer» Correct Answer - B
`underset(sp^(2))overset(* *)(NH_(3))+H^(+)rarrunderset(sp^(3))(N)H_(4)^(+)`
`underset(sp^(3))(2NH_(3))hArrunderset(sp^(3))(NH_(2)^(-))+underset(sp^(3))(NH_(4)^(+))`
`underset(sp^(3))(H_(3)BO_(3)+OH^(-)) rarr underset(sp_(+)^(3))([B(OH)_(4)]^(-))`
`underset(sp^(3))(H_(2)O)+H^(+)hArr underset(sp^(3))(H_(3)O^(+))`


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