detailed solution
Correct option is B
Number of electron pairs(EP)=V+M-C+A2; V=Group number of central atom; M=-H, -X, -OH....monovalent groups attached to central atom ; C=Charge of cation ; A=Charge of anion ; V=2,3.4,5,6,7,8 respectively for 2nd,13th,14th,15th, 16th, 17th, 18th group elements ; Number bond pairs, BP(according to VSEPR theory)=Number of atoms directly attached to central atom; =4,4,3,3 respectively in XeO4,ClO4- XeO3,,ClO3- ; ***According to VSEPR theory, double bond and triple bond are counted as one bond pair only ; If the bonded atom is Oxygen..... Magnitude of Oxidation state of central atom= Total bonds ; Number of atoms directly attached to central atom=sigma bonds ; Total bonds-sigma bonds = pi bonds ; Number lone pairs on central atom(LP)=EP-BP ; =0,0,1,1 respectively in XeO4,ClO4- XeO3,,ClO3- ; XeO4-'4' bp +'0' lp on central atom ; sp3-Tetrahedral ; Total 8 lone pairs/molecule ; 8 lone pairs on bonded atoms ; ....Orientation of electron pairs....Tetrahedral ; ClO4--'4' bp +'0' lp on central atom ; sp3-Tetrahedral ; Total 9 lone pairs/ion ; 9 lone pairs on bonded atoms ; ....Orientation of electron pairs....Tetrahedral ; XeO3-'3' bp +'1' lp on central atom ; sp3-Pyramidal; Total 7 lone pairs/molecule ; 6 lone pairs on bonded atoms ....Orientation of electron pairs....Tetrahedral ; ClO3--'3' bp +'1' lp on central atom ; sp3-Pyramidal; Total 8 lone pairs/ion ; 7 lone pairs on bonded atoms ....Orientation of electron pairs....Tetrahedral ; Note; Each double bonded oxygen atom has '2' lone pairs on it ; Each single bonded oxygen atom has '3' lone pairs on it ; XeO4 : Magnitude of Oxidation state of central atom= Total bonds=8 ; Number of atoms directly attached to central atom=sigma bonds=4 ; Total bonds-sigma bonds = pi bonds=4--'0' pπ-pπ and '4' dπ-pπ bonds ; ClO4- : Magnitude of Oxidation state of central atom= Total bonds=7 ; Number of atoms directly attached to central atom=sigma bonds=4 ; Total bonds-sigma bonds = pi bonds=3--'0' pπ-pπ and '3' dπ-pπ bonds ; XeO3 : Magnitude of Oxidation state of central atom= Total bonds=6 ; Number of atoms directly attached to central atom=sigma bonds=3 ; Total bonds-sigma bonds = pi bonds=3--'0' pπ-pπ and '3' dπ-pπ bonds ; ClO3- : Magnitude of Oxidation state of central atom= Total bonds=5 ; Number of atoms directly attached to central atom=sigma bonds=3 ; Total bonds-sigma bonds = pi bonds=2--'0' pπ-pπ and '2' dπ-pπ bonds ;