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Most Important Selected Qs for JEE AdvancedChemistryCoordination Compounds

How many of the following contain all or some iron in +2 oxidation state? (a) FeS ₂ (b) Haematite (c) Magnetite (d) Brown ring complex (e) Na ₂ [ Fe ( CN )₅( NO ) ] (f) Fe [ Fe ( CN )₆ ] (g) K ₂ Fe [ Fe ( CN )₆ ] (h) Ferrocene ( [ Fe ( C ₅ H ₅ )₂ ] ) (i) FeWO ₄

Correct answer

6

Step-by-step solution

aligned & +2 FeS ₂ , +3 Fe ₂ O ₃, Fe ₃ O ₄ ( +2 + +2 Fe + Fe ₂ O ₃ ), & [ Fe ( H ₂ O )₅( NO ) ]²⁺, Na ₂ [ +2 Fe ( CN )₅( NO ) ], +3 Fe [ +3 ( Fe ( CN )₆ ], . & K ₂ +2 Fe [ +2 ( Fe ( CN )₆ ], +2 Fe ( C ₅ H ₅ )₂, +2 Fe WO ₄ . aligned

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