Illustrate the chemistry of dihydrogen by its reaction with
(i) `N_(2)`

Explanation

i) Reaction with `N_(2)` : Dihydrogen reacts with nitrogen in presence of iron catalyst to form ammonia.
`N_(2(g))+3H_(2(g))overset("Fe-catalyst")hArr2NH_(3(g))+92KJ//"Mole"`
`to` This process is called as Haber.s process. Here temperature used is around 700K and pressure used is 200 atm.
ii) a) Reaction with metal ions : Hydrogen reduces metal ions in aqueous solution into metals.
`H_(2(g))+Pd_((aq))^(+2)toPd_((s))+2H_((aq))^(+)`
(b) Reaction with metal oxides : Hydrogen reduces metal oxides into metals.
`WO_(3)+3H_(2)toW+3H_(2)O`
iii) Reaction with organic compounds :
a) Vegetable oils undergoes, hydrogenation in presence of .Ni. catalyst and forms vanaspathi.
b) Alkenes undergo hydro formylation and forms aldehydes. These aldehydes undergo reduction to form alcohols.
`CH_(2)=CH_(2)+CO+H_(2)toCH_(3)-CH_(2)CHO("Aldehyde")`
`CH_(3)CH_(2)CHO+H_(2)tounderset("Alcohol")(CH_(3)CH_(2)CH_(2)OH)`
Use of Dihydrogen in the manufacture of chemicals
`to` Dihydrogen is used in the manufacturing of industrial chemicals like methanol, ammonia, hydrogen chloride etc.
`CO_((g))+2H_(2(g))overset("Co-Catalyst")tounderset("Methanol")(CH_(3)OH_((l)))`
`N_(2(g))+3H_(2(g))overset("Fe-catalyst")to2NH_(3)+92KJ//"Mole"`
`H_(2(g))+Cl_(2(g))hArr2HCl_((g))`
`to` It is used in the manufacture of nitric acid and fertilisers.