Petroleum Refinery Engineering
Refractive index of a petrofuel which is the ratio of velocity of light in air to its velocity in the petrofuel gives an indication if its

Molecular weight
Both A & B
Aromatics content
Neither A nor B

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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
None of these
High purity products can be obtained thereby
High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose

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