The process does not involve a catalyst is :

Haber process

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Contact process

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Thermite process

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Ostwald process

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Solution

The correct option is C Thermite process
In thermite process, no catalyst is required.
$F e_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 F e + H e a t$
This reaction evolves a lot of heat which provides energy to the reaction.

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