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Which of the following metals is inert (does not dissolve) in dilute HNO3 (20%)?

1. Au
2. Cu
3. Zn
4. Ag

Correct answer: Au

Solution

Gold (Au) is inert to dilute HNO3 because its standard reduction potential is very high (Au3+/Au = +1.50 V), making it thermodynamically unreactive toward dilute acids. It dissolves only in aqua regia.

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