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In hot concentrated acid, nitric is an oxidizing acid:

3Zn + 8HNO3 → 3Zn(NO3)2 + 2NO + 4H2O

But in cold, dilute solutions:

Zn(s) + 2HNO3 (aq) → Zn(NO3)2 (aq) + H2 (g)

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