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# The catalyst used in manufacture of $HNO_3$ is

$(a)\;Pt\qquad(b)\;Ni\qquad(c)\;Fe\qquad(d)\;Mo$

The catalyst used in manufacture of $HNO_3$ process is Pt.
This process involves oxidation of the ammonia from the Haber Process by oxygen in the air in the presence of a platinum-rhodium catalyst.
edited Jul 29, 2014