Answer : The correct alternative is, (2) Cr (Chromium)Explanation :The reactivity collection of steel are arranged of the reactivity indigenous the highest possible to the lowest. Reactivity collection is used to determine the assets of the single displacement reactions. In the solitary displacement reaction, the most reactive steel displaces the the very least reactive metal.From the provided reactivity series we conclude that there are two steel (Mg and also Cr) are an ext reactive metal than the Ni and there room two metal (Pb and Cr) are much less reactive steel than the Zn. So, the Cr (Chromium) is the metal which is more active than Ni and less energetic than Zn.Hence, the correct choice is, (2) Cr

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