Concept:Carbon black is a fine form of elemental carbon produced by incomplete combustion of hydrocarbons.
Explanation:Carbon black is obtained by burning hydrocarbons like methane in a limited supply of air.
This incomplete combustion yields fine carbon particles instead of complete oxidation to
CO2​.
For example:
CH4​+O2​→C+2H2​O (unbalanced, simplified representation).
It is used as a black pigment in inks and as a reinforcing filler in automobile tyres.
Heating wood at high temperature in the absence of air produces charcoal, not carbon black.
Heating coal at high temperature in the absence of air results in destructive distillation, yielding coke and tar.
Heating coal in the presence of air leads to complete combustion, forming
CO2​.
Answer:Option 3 (By burning hydrocarbons in a limited supply of air).