Which of the following is the most corrosion-resistant metal known?

Iron

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Bismuth

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Rhenium

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Iridium

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Solution

The correct option is D Iridium
Iridium is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Although only certain molten salts and halogens are corrosive to solid iridium, finely divided iridium dust is much more reactive and can be flammable. Iridium was discovered in 1803 among insoluble impurities in natural platinum.

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