Pyrolysis
A. is a biochemical conversion process
B. is useful for production of bio-oil
C. yields minimum waste
D. liquid is a good substitute of heating oil
E. can produce Ethanol
Choose the correct answer from the options given below:
B, C, D only
Pyrolysis is the thermal decomposition of organic (carbon-based) material at high temperature in the complete absence of oxygen. Because heat, not living organisms or enzymes, drives the breakdown, pyrolysis is classified as a thermochemical process. This single fact is the key to sorting the statements.
Evaluating each statement:
The claim that pyrolysis is a biochemical conversion process is incorrect — biochemical conversion relies on microbes or enzymes (as in fermentation or anaerobic digestion), whereas pyrolysis is purely heat-driven.
The claim that it is useful for producing bio-oil is correct — a principal product of pyrolysis is a liquid bio-oil, alongside solid char and combustible syngas.
The claim that it yields minimum waste is correct — nearly all of the feedstock is converted into usable bio-oil, char and gas, leaving very little residual waste.
The claim that the pyrolysis liquid is a good substitute for heating oil is correct — the bio-oil produced can be burned in place of conventional heating oil for energy.
The claim that pyrolysis can produce ethanol is incorrect — ethanol is obtained through fermentation, a biochemical process carried out by microorganisms on sugars, not through the oxygen-free thermal route of pyrolysis.
So the true statements are exactly the bio-oil production, the minimum-waste, and the heating-oil-substitute claims — three statements — which corresponds to the option listing only those three.
Correct answer: B, C, D only.
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