Regarding pyrolysis, which of the following statements are correct?

1.It is a biochemical conversion process

2.It is useful for the production of bio-oil

3.It yields minimum waste

4.Its liquid is a good substitute for heating oil

5.It can produce ethanol

A1, 2, 3 & 4 only

B2, 3 & 4 only ✓ Correct

C2, 3, 4 & 5 only

D1, 4 & 5 only

Correct answer: (B) 2, 3 & 4 only

Explanation

Statement 2, Statement 3 and Statement 4 together form the correct set.

Statement 1 is wrong, since pyrolysis is a thermochemical, not a biochemical, conversion.

Statement 2 is right, because heating biomass without oxygen yields useful bio oil.

Statement 3 is right, as the process leaves little residual waste, mostly usable char.

Statement 4 is right, since the bio oil produced can substitute for heating oil.

Statement 5 is wrong, as ethanol comes from fermentation, not from pyrolysis.

Pyrolysis of biomass also yields syngas and biochar useful as a soil amendment.

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