Particulates corrode the surface of metals in the presence of which of the following substances?

Particulates corrode the surface of metals in the presence of which of the following substances? Correct Answer Sulphur dioxide and moisture

Particulates, either by themselves or in the presence of sulphur dioxide and moisture, corrode the surface of metals (both ferrous and non-ferrous). Metals they can affect are steel, copper, and zinc, among others.
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