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

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Oxidation of ammonia to form HNO₃

Hardening of oils

Production of synthetic rubber

Synthesis of methanol

answer is A.

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Detailed Solution

$4NH_{3(g)}\;+5O_{2(g)}\;\xrightarrow[9bar,500K]{Pt-Rh guaze}\;4NO_(g)\;+6H_2O_(l)$

Hardening of oils.....Nickel

production of synthetic rubber.....Sodium

synthesis of methanol....ZnO+Cr₂O₃(or) Cobalt

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