`(i) oH_(2)(g) + M_(m)O_(o)(s) overset(Delta)mM(s) + oH_(2)O(l) " "(ii) CO(g)+ 2H_(2)(g)underset("Catalyst")overset(Delta)to underset("Methanol")(CH_(3)OH(l))`
`(iii) C_(3)H_(8)(g) + 3H_(2)O(g) overset(Ni,1270K)to 3CO(g) + 7H_(2)(g)`
`(iv) Zn(s) + 2NaOH (aq) overset("heat")to underset("Sod. zincate")(na_(2)ZnO_(2)(aq))+ H_(2)(g)`