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?

1. A

   1 and 2 only

   1 and 2 only. Sulphur in FO is also true.

2. B

   2 and 3 only

   2 and 3 only. It is a refinery residue.

3. C

   1 and 3 only

   1 and 3 only. Power use in industry is real.

4. D

   1, 2 and 3

   All three. Residual fuel oil from refineries; used in boilers/power; high sulphur.

Summary. Official key is (d) all three. Furnace oil is a heavy refinery product, burned for heat and captive power, and it carries sulphur into the stack.