Question:
Identify anionic complex from following.
Identify anionic complex from following.
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Check suffix: “-ate” in name often indicates anionic complex.
Updated On: May 4, 2026
- Sodium hexafluoroaluminate(III)
- Tetraamminecopper(II) ion
- Triamminetrinitrocobalt(III)
- Pentacarbonyliron
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The Correct Option is A
Solution and Explanation
Concept:
Anionic complexes carry a negative charge on the coordination entity.
Step 1: Analyze each option.
• (A) Sodium hexafluoroaluminate(III) → \([AlF_6]^{3-}\) → anionic complex \checkmark
• (B) Tetraamminecopper(II) → \([Cu(NH_3)_4]^{2+}\) → cationic $\times$
• (C) Triamminetrinitrocobalt(III) → neutral complex $\times$
• (D) Pentacarbonyliron → neutral complex $\times$
Step 2: Conclusion. \[ \text{Anionic complex = } [AlF_6]^{3-} \]
Anionic complexes carry a negative charge on the coordination entity.
Step 1: Analyze each option.
• (A) Sodium hexafluoroaluminate(III) → \([AlF_6]^{3-}\) → anionic complex \checkmark
• (B) Tetraamminecopper(II) → \([Cu(NH_3)_4]^{2+}\) → cationic $\times$
• (C) Triamminetrinitrocobalt(III) → neutral complex $\times$
• (D) Pentacarbonyliron → neutral complex $\times$
Step 2: Conclusion. \[ \text{Anionic complex = } [AlF_6]^{3-} \]
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