Question

(a) Write the formula and describe the structure of a noble gas species which is isostructural with
(i) `"Ibr"_(2)^(-)`
(ii) `BrO_(3)^(-)`
(b) Assign reasons for the following :
(i) `SF_(6)` is kinetically inert.
(ii) `NF_(3)` is an exothermic compound whereas `NCl_(3)` is not.
(iii) HCl is a stronger acid than HF though fluorine is more electronegative than chlorine.

Answer 1

(a) (i) `XeF_(2)`=liner
(ii) `XeO_(3)` =Pyramidal
(b) (i) Because sulphur is stericoly protected by six Fatoms.
(iii) H-X bond length increases for HCl, bond dissociation energy decreases. Hence HCl is strong acid than HF