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How many of the following compounds have sp3 hybridisation?

(i) SO42- (ii) SO32- (iii) PO43- (iv) NH4+ (v) I3 (vi) CO32- (vii) C2O42-


The acids, per acids and their ions have same hybridisation of central atom.

Thus, SO42,SO32,PO43,NH4+ all have same sp3 hybridisation.

v.I3 have sp3d hybridisation.
vi. CO32- and 

vii. C2O42- have sp2 hybridisation.

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