MCQ
सबसे स्थायी आयन है :
- A$\left[ Fe ( OH )_3\right]^{3-}$
- B$\left[ Fe ( Cl )_6\right]^{3-}$
- ✓$\left[ Fe ( CN )_6\right]^{3-}$
- D$\left[ Fe ( H_2O)_6\right]^{3+}$
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