61. Butadiene is a/an
62. Both asphalt and wax are produced by __________ base crude oils.
63. Paraffins are desirable in lubricating oil, as it has got high
64. Extractor temperature is maintained at -20°C in Edeleanu process to reduce the __________ of kerosene.
65. Petroleum coke is commercially produced by the __________ process.
66. Road grade bitumen is produced from vacuum residue by its
67. Visbreaking process is used mainly for making
68. Research octane number refers to the
69. Choose the correct statement.
70. Choose the correct statement.
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