Which one of the following reactions will occur spontaneously at standard-state conditions and 25°C? O Au + 3K* - Au* + 3K O Ni²* + 2FE2*(aq) – Ni(s) + 2Fe*(aq) Cu + 2H* Cu2* + H2 O Mg + Ca- Mg + Ca2+ 2A3+ + 3Fe - 2AI + 3FE2+

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