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On the basis of trends in the properties...

On the basis of trends in the properties of the `3d`-series elements , suggested possible `M^(2+)` aqua ions for use as reducing agents , and write a balanced chemical equation for the reaction of one of those ions with `O_(2)` in acidic solution.

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To solve the question, we will follow these steps: ### Step 1: Identify the 3d series elements The 3d series elements include Scandium (Sc), Titanium (Ti), Vanadium (V), Chromium (Cr), Manganese (Mn), Iron (Fe), Cobalt (Co), Nickel (Ni), Copper (Cu), and Zinc (Zn). ### Step 2: Determine possible M^(2+) aqua ions as reducing agents Among these elements, the transition metals from Scandium to Manganese (Sc to Mn) tend to have a +2 oxidation state that can act as reducing agents. Specifically, we can consider: - Chromium (Cr²⁺) ...
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