Answer

Ammonia is prepared using the Haber’s process. The yield of ammonia can be maximized under the following conditions:

(i) High pressure $\left(\propto^{1 / 4} 200 \mathrm{~atm}\right)$

(ii) A temperature of $\propto^{1 / 4700 \mathrm{~K}}$

(iii) Use of a catalyst such as iron oxide mixed with small amounts of $\mathrm{K_2} \mathrm{O}$ and $\mathrm{Al_2} \mathrm{O_3}$

Answer

$\mathrm{NH_3}$ acts as a Lewis base. It donates its electron pair and forms a linkage with metal ion.

$ \underset{\text{Blue}}{\mathrm{Cu_{(a q)}^{2+}}}+4 \mathrm{NH_{3(a q)}} \leftrightarrow \underset{\text{Deep Blue}}{\left[\mathrm{Cu}\left(\mathrm{NH_3}\right)_{4}\right]^{2+} \tiny{(a q)}} $

Blue