Blue line on gums seen in which poisoning?
Ans. is 'b' i.e., Mercury * Burtonian line is blue line, which is seen on upper gums in lead poisoning.* Similar blue line (but not called burtonian line in these cases) is also seen in poisoning with Mercury (Hg), Copper (Cu), Silver (Ag), bismuth (Bi), and Iron (Fe).
Zinc
Mercury
Phenol
Oxalic acid
Toxicology