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

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Synthesis of methanol

Production of synthetic rubber

Hardening of oils

Oxidation of ammonia to form ${HNO}_{3}$

answer is A.

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Detailed Solution

The Ostwald process is used for the manufacturing of nitric acid. During this process, platinum is used as a catalyst to convert ammonia into nitric oxide which is further converted into nitric acid.

The reaction is as follows:

$4 {NH}_{3} + 5 O_{2} \overset{(in presence of Pt)}{\to} 4 NO + 6 H_{2} O$

Hence, option (A) is correct.

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