With reference to furnace oil, consider the following statements :
1. It is a product of oil refineries.
2. Some industries use it to generate power.
3. Its use causes sulphur emissions into environment.
Which of the statements given above are correct?

Correct Option: 1, 2 and 3

Statement 1 is correct as furnace oil is a dark, viscous residual petroleum product obtained during the distillation of crude oil in petroleum refineries. Statement 2 is correct since heavy industries and thermal power plants use furnace oil for industrial heating and power generation. Statement 3 is correct because furnace oil has a high sulphur content, and its combustion results in significant sulphur dioxide emissions, contributing to air pollution.