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IUPAC names of four complexes

Short answer

i) pentaaquachlorochromium(III) chloride, ii) tris(ethylenediamine)cobalt(III) bromide, iii) potassium tetrachloronickelate(II), iv) bis(benzene)chromium(0).

Name the following complexes by IUPAC system i) [Cr(H₂O)₅Cl]Cl₂ ii) [Co(en)₃]Br₃ iii) K₂[NiCl₄] iv) [Cr(C₆H₆)₂]

i) [Cr(H₂O)₅Cl]Cl₂: pentaaquachlorochromium(III) chloride ii) [Co(en)₃]Br₃: tris(ethylenediamine)cobalt(III) bromide iii) K₂[NiCl₄]: potassium tetrachloronickelate(II) iv) [Cr(C₆H₆)₂]: bis(benzene)chromium(0)

Rules used: ligands are named in alphabetical order before the metal; anionic complexes end in "-ate"; the oxidation state is written in Roman numerals in brackets; for complex cations or neutral complexes the metal name is unchanged.

✓ Answer checked by Claude Opus 5.5 (high effort)

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