Chemical Process
Nickel is not used as a catalyst in the

Shift conversion
Ostwald's process of HNO₃ manufacture
Hydrogenation of oil
Fischer-Tropsch process

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Chemical Process
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

Greater tendency of decomposition at elevated temperature
Hydrolysis tendency in presence of water
Poor oxidation stability and high gum forming tendency
All of these

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