Based on the activity series of metals, aluminium, Al can reduce Cr3+ ions but cannot reduce Mn2+ ions.
The activity series of metals is an arrangement of metals in decreasing order of reactivity.
Metals found up in the series are very reactive and are good reducing agents.
Metals lower in the series are not very reactive.
Aluminium is higher than both Chromium and Manganese in the series.
From the activity series of metals, aluminium can reduce Cr3+ ions but cannot reduce Mn2+ ions.
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