Which is not a noble metal?

Gold

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Osmium

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Iridium

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Iron

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Solution

The correct option is D Iron
Noble metals are the metals resistant to corrosion and oxidation in moist air. They are highly unreactive and are found in free state and not in the ore form in nature such as gold, silver, platinum, palladium, osmium, iridium.
Iron is therefore not a noble metal.

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