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Consider the following reduction processes : Zn 2+ + 2e – → Zn(s) ; Eº = – 0.76 V Ca 2+ + 2e – → Ca(s); Eº = –2.87 V Mg 2+ + 2e – → Mg(s) ; Eº = – 2.36 V Ni 2 + 2e – → Ni(s) ; Eº = – 0.25 V The reducing power of the metals increases in the order :

1. Ca < Mg < Zn < Ni
2. Ni < Zn < Mg < Ca
3. Zn < Mg < Ni < Ca
4. Ca < Zn < Mg < Ni

Correct answer: Ni < Zn < Mg < Ca

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