Draw structure of `HClO_4`.

Draw the structure of HClO_4 . What is the oxidation number of Cl in this compound? Write the formula of oxyacid of Cl in its +5 oxidation state.

Draw structure of H_3PO_4 .

Draw structure of SF_6

Draw the structure of CrO_4^(2-) .

Draw structures of NH_(4+) and H_3PO_4 .

Draw structure of HNO_3 , PH_3 and H_3PO_4

Draw structure of IF_3 .