Given below are two statements: Statement I: Biodiesel can be created from…
2023
Given below are two statements:
Statement I: Biodiesel can be created from vegetable oils and animal fats.
Statement II: Biodiesel viscosity is significantly lower than that of petroleum diesel.
In the light of the above statements, choose the most appropriate answer from the options given below:
Answer: C. Statement I is correct but Statement II is incorrect — CONCEPTBiodiesel is a fuel of mono-alkyl esters produced by transesterifying triglycerides in biological lipids. Its viscosity must be compared with the…
- A.
Both Statement I and Statement II are correct
- B.
Both Statement I and Statement II are incorrect
- C.
Statement I is correct but Statement II is incorrect
- D.
Statement I is incorrect but Statement II is correct
Show answer & explanation
Correct answer: C
CONCEPT
Biodiesel is a fuel of mono-alkyl esters produced by transesterifying triglycerides in biological lipids.
Its viscosity must be compared with the stated reference fuel; a reduction from raw vegetable oil does not imply a value below petroleum diesel.
APPLICATION
Statement I concerns feedstock chemistry: vegetable oils and animal fats contain triglycerides that can be converted into biodiesel.
Statement II compares finished biodiesel with petroleum diesel. Biodiesel specifications commonly allow about 1.9–6.0 mm²/s at 40 °C, while petroleum-diesel ranges are generally lower or overlapping, so biodiesel is not significantly less viscous.
Transesterification sharply lowers the viscosity of raw oils, but that oil-to-biodiesel change is not the biodiesel-to-petroleum-diesel comparison made in Statement II.
CONTRAST
“Both Statement I and Statement II are correct” carries the raw-oil viscosity reduction into the wrong comparison baseline.
“Both Statement I and Statement II are incorrect” overlooks the established use of biological triglycerides as biodiesel feedstocks.
“Statement I is correct but Statement II is incorrect” keeps feedstock chemistry separate from the finished-fuel viscosity comparison.
“Statement I is incorrect but Statement II is correct” reverses the feedstock evidence and uses the wrong viscosity baseline.
Result: Statement I is correct, but Statement II is incorrect.