Question

Silver is more likely to tarnish near a petroleum refinery than in place far away from it explain it

Answer 1

Tarnish is a thin layer of corrosion which forms over metals including silver. One of the main reasons for silver to tarnish is when it comes in contact with hydrogen sulphide.

Ag + H2S = Ag2S + H2

Silver + hydrogen sulphide = silver sulphide + hydrogen

Hydrogen sulphide is released during pollution. There is a higher concentration of hydrogen sulphide in cities and oil refineries than in places far away from it. Therefore the rate of tarnish increases.