Which dense, viscous fraction collected from the base of the petroleum fractionating tower is used for road surfacing and roofing waterproofing?

Answer and explanation

Correct answer: B. Bitumen

  1. Step 1: Examine petroleum fraction outputs: fractions collect at distinct temperature zones along the column.
  2. Step 2: Bitumen consists of the longest carbon chains (), having the highest boiling points (). It remains as an unboiled thick viscous residue used for road tarmac and waterproofing.
Answer
Bitumen.
Why not the others: 'Kerosene' () is used as aviation jet fuel and domestic lamp oil; 'Naphtha' () is a petrochemical feedstock for plastics; 'Petrol (Gasoline)' () is motor vehicle fuel.

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