Elements of Groups 16, 17 and 18
- The shape of the XeF4 molecule is Answer: A. square planar Xe has 4 bond pairs and 2 lone pairs (sp³d²). The lone pairs sit trans to each other, giving a square planar shape. 1
- The oxidation state of sulphur in peroxodisulphuric acid (H2S2O8) is Answer: A. +6 There is one peroxide O–O link (each O −1) and six oxygens at −2: 2+2x-2-12=0⇒ x=+6 . 1