Chemistry
Tetra ethyle lead (TEL) is

An antioxidant
A catalyst in burning fossil fuel
An antiknock compound
A reductant

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Chemistry
The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Tendency of carbon dioxide to form a layer along with dust smoke
Interrupted release of moisture from the material
Accumulation of smoke and dust over the sigrees
Lack of oxygen in the surroundings of sigrees

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