(a)How is ammonia prepared on a large scale ? Name the process and mention the optimum conditions for the production of ammonia by this process.
(b) Assign reasons for the following :
(i) `H_(2)S` is more acidic than `H_(2)O`
(ii) `NH_(3)` is more basic than `PH_(3)`
(iii) Sulphur has a greater tendency of catenation than oxygen

Explanation

(a) `N_(2) + 3H_(2) overset(Fe)hArr 2NH_(3)` Ctalyst=iron oxide `+k_(2)O+Al_(2)O_(3)`
Process name =Haber's process
Condition, Low temperature/700 k and high pressure.
(b) (i) Bond dissociation enthallpy of S-H bond is lower than that of O-H bond.
(ii) Due to small size of N than P lone pair is readily available for donation is `NH_(3)` whereas in `PH_(3)` lone pair in delocalized due to larger size of P.
(iii) N/A