Discussion
The aniline point of an oil is the temperature at which it becomes
Answer: C
Correct answer: completely miscible with an equal volume of aniline
The aniline point measures the aromatic content indirectly: aromatics dissolve aniline readily, so an oil rich in them becomes miscible at a low temperature. A high aniline point therefore indicates a paraffinic oil, which is what is wanted for a lubricant, since aromatics oxidise more readily and attack rubber seals.
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