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Explain these facts: (a) Copper and iron have several oxidation states, whereas zinc exists in only...

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Chemistry

Explain these facts: (a) Copper and iron have several oxidationstates, whereas zinc exists in only one.

(b) Copper and iron form colored ions, whereas zinc doesnot.

(c)Hydrated Mn2+ ions are practically colorless even though theypossess five 3d electrons.

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