Question

Choose the correct statement.

• A. $[Co(NH_3)_6]^{2+}$ is oxidised to diamagnetic $[Co(NH_3)_6]^{3+} $by the oxygen in air
• B. Tetrahedral complexes are more stable than octahedral complexes
• C. $[Fe(CN)_6]^{3-}$ is stable but $[FeF_6]^{3-}$ is unstable
• D. The $[Cu(NH_3)_4]^{2+}$ ion has a tetrahedral geometry and is diamagnetic

Answer 1

Answer: (A)

(b) Tetrahedral complexes are less stable than octahedral complexes.
(c) $[Fe(CN)_6]^{3-}$ and $[FeF_6]^{3-}$ both are stable but former is more stable.
(d) $[Cu(NH_3 )_4]^{2+}$ has square planar geometry and is paramagnetic