\(HNO_3\)

The correct answer is 1. \(HNO_3\).

In the Ostwald process, nitric acid is manufactured by the oxidation of ammonia with oxygen in the presence of a platinum catalyst. The reaction is as follows:

\(4NH_3 + 5O_2 → 4NO + 6H_2O\)

The platinum catalyst helps to speed up the reaction and to produce a high yield of nitric acid.

\(H_2SO_4\), \(CH_3COOH\), and \(H_2O_2\) are not manufactured using the Ostwald process.

So the answer is 1. \(HNO_3\).