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Identify the following: (1) Transition metal of 3d series that exhibits only one oxidation state. (2) Transition metal of 3d series that acts as a strong reducing agent in +2 oxidation state in aqueous solution.
Complete and balance the following equations: (1) Cr₂O₇²⁻ + 14H⁺ + 6Fe²⁺ → (2) KMnO₄ (heat) →
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