Question

what is a coal tar ? plz tell

Answer 1

Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal. It has both medical and industrial uses. It may be applied to the affected area to treat psoriasis and seborrheic dermatitis. It may be used in combination with ultraviolet light therapy. 

Answer 2

Coal tar is a thick black liquid produced by distilling bituminous coal. It contains benzene, naphthalene, phenols, aniline and many other organic chemicals.