NCERT Important Questions Class 9 Science biology Chapter 14
Important NCERT Extra Questions
Chapter 14 Natural Resources
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
Why are lead compounds are added to petrol? How is it harmful?
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Lead compounds are added to petrol to reduce knocking, i.e., rapid combustion. Burning of this petrol leads to formation of lead halides (bromides and chlorides) which are emitted into air with exhaust. Lead inhalation causes anaemia and brain damage, lead poisoning which disturbs the nervous system, liver and kidney.