Multiple choice Which of the following types of crude oils is/are generally rich in semi-solid waxes? Paraffinic-base type crude Asphaltic-base type crude Mixed base type crude All the three are equally rich in semi solid waxes. Reveal answer Fill a bubble to check yourself C Correct answer Explanation Mixed base type crude contains both paraffinic and asphaltic hydrocarbons and are, generally, rich in semi-solid waxes.