Question

gold and Platinum are called Noble metals why

Answer 1

Platinum and gold dissolve in the acid solution aqua regia. On the other side not all corrosion-resistant metals are considered to be noble metals. They are unreactive ie they resist corrosion and other chemical attack - hence why they are mostly found in their elemental states and not oxides.

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Answer 2

The noble metals are metals that are resistant to corrosion and oxidation in moist air, unlike most base metals. They tend to be precious, often due to their rarity in the Earth's crust. The noble metals are most commonly considered to be platinum, and gold.