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Which of the following metals are regarded as noble metals?

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in Corrosion Engineering by (98.5k points)
Which of the following metals are regarded as noble metals?

(a) Iridium

(b) Palladium

(c) Ruthenium

(d) Iridium, palladium, and ruthenium

This question was posed to me in an online quiz.

My doubt is from Materials topic in chapter Materials of Corrosion Engineering

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Correct answer is (d) Iridium, palladium, and ruthenium

The best I can explain: Noble metals are the metals that are characterized by highly positive potentials relative to the hydrogen electrode along with excellent corrosion resistance. This includes iridium, palladium, ruthenium, rhodium, osmium, gold, silver, and platinum.

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