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Although it can be derived_ oil, coal, and tar kerosene is usually produced_ refining it from petroleum.
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Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.
After the increase of price of oil by 40%, a family decided to reduce its oil consumption so that the expenditure for oil goes up by 26% only. If the total consumption of oil before the price rise was 10 kg per month, then what is the current consumption of oil per month (in kg)?
Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because
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The import of crude oil and petroleum done from national oil companies of producer countries, which have a net exportable surplus of oil is by
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Coal tar (produced by high temperature carbonisation) is the main source of
অপরিশোধিত পেট্রোলিয়াম বিশোধনে যে প্রক্রিয়া অধিক কার্যকর (In refining crude petroleum the more effective operation is)