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

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

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Petroleum Refinery Engineering
Polymerisation

Causes olefins to combine with each other
Produces i-octane from cracked gases containing i-butane and butene
Causes aromatics to combine with each other
Is aimed at producing lubricating oil

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