How many of the following compounds violate octet rule
(i) `BrF_(5)` (ii) `SF_(6)` (iii) `IF_(7)` (iv) `XeOF_(4)`
(v) `CIF_(2)` (vi) `PCI_(4)^(o+)` .

Which one of the following does not exist ? (i) XeOF_(4) (ii) NeF_(2) (iii) XeF_(2) (iv) XeF_(6) .

Which one of the following does not exist ? (i) XeOF_(4) (ii) NeF_(2) (iii) XeF_(2) (iv) XeF_(6) .

How are the following interhalogen compounds prepared? (i) ClF_(3) (ii) ICl (iii) BrF_(5) .

How many of the following compounds have sp^(3) hybridisation (i) SO_(4)^(2-) (ii) SO_(5)^(2-) (iii) PO_(4)^(3-) (iv) PO_(5)^(3-) (v) I_(3)^(Theta) (iv) CO_(3)^(2-) (vii) CO_(4)^(2-) .