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Which of these statements is accurate?

1. Both Hg2+ and Hg22+ ions display divalent behavior.
2. The ionization energies of group 12 elements are significantly higher than those of coinage metals, yet they are more chemically active.
3. The ionization energy of mercury is lower compared to cadmium.
4. Zinc, cadmium, and mercury have positive oxidation potentials.

Correct answer: Both Hg2+ and Hg22+ ions display divalent behavior.

Solution

Both Hg2+ and Hg22+ ions indeed display divalent behavior, as they can both form compounds with a +2 oxidation state.

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