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  4. In which of these processes platinum is used as a catalyst?

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Q. In which of these processes platinum is used as a catalyst?

ManipalManipal 2005The p-Block Elements - Part2

Solution:

Platinum acts as catalyst in the oxidation of ammonia to form nitric oxide. This reaction is used in the Ostwalds method of nitric acid preparation.
$ 4NH_3 + 5O_2 \xrightarrow[750^{\circ}C]{Pt} 4NO + 6H_2O $
$2NO + O_2 \to 2NO_2$
$4NO_2 + O_2 + 2H_2O \to 4HNO_3$