Question

is used as a catalyst in the catalytic oxidation of ammonia.

• A. Iron
• B. Lead
• C. Platinum
• D. Molybdenum

Answer 1

The correct option is C Platinum

This is the starting reaction of the Oswald's process for the manufacture of nitric acid where Platinum continues to glow even after heating is discontinued since the catalytic oxidation of ammonia is an exothermic reaction.
$4{\mathrm{NH}}_3+5O_2\stackrel{\mathrm{Pt}}{\to }4\mathrm{NO}+6H_{2}O$