Petroleum Refinery Engineering
Antioxidants are added in petrol to

Impart colour to it, for easy identification
Prevent icing of the carburettor
Minimise the gum formation
Prevent the lead build up in engines

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Petroleum Refinery Engineering
Crude oil is subjected to vacuum distillation in the last stage, because

Lighter/low boiling products are prone to thermal decomposition
High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose
High purity products can be obtained thereby
None of these

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