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The appropriate response is Aluminum. It has higher in the movement arrangement than a nickel. Aluminum metal is so artificially responsive that local examples are uncommon and constrained to outrageous decreasing conditions. Rather, it is discovered joined in more than 270 unique minerals.

The metal which replaces the chromium atom from the Cr₂O₃ solution is the aluminum metal.

What is electrochemical series?

Electrochemical series is a sequence of metal according to the reactivity and stability of the metals present in any aqueous solution. As reactivity increases from bottom to up of the series.

In this question replacement is asked for the nickel or aluminum metal.

In the electrochemical series nickel is present below the chromium and aluminum is placed above the chromium so aluminum will replace chromium in Cr₂O₃.

Hence aluminum will replace chromium.

To know more about electrochemical series, visit the below link:

https://brainly.com/question/14652325

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