Platinum is used as a catalyst in:

oxidation of ammonia to form nitric acid

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hydrogenation of oils

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production of synthetic rubber

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synthesis of methanol

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Solution

The correct option is B oxidation of ammonia to form nitric acid
In the Ostwald process, ammonia is converted to nitric acid in a two step process. It is oxidised with oxygen in the presence of platinum catalyst. The overall reaction is as follows:
$4 N H_{3} + 5 O_{2} \to 4 N O + 6 H_{2} O$

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Platinum is used as a catalyst in the catalytic oxidation of ammonia at high temperature (800⁰C).

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