The rate of the following redox reaction is slowest when X is [Co^ III (NH3 )5 X ]3+/ 2++ [Cr^ II (H2 O )6 ]2+ [Co^ II (NH3 )5 (H2 O ) ]2++ [Cr^ III (H2 O )5 X ]3+/ 2+

ABC26IN0399 · Coordination Chemistry

Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Medium

The rate of the following redox reaction is slowest when X is

\[ \left[\mathrm{Co}^{\text {III }}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{X}\right]^{3+/ 2+}+\left[\mathrm{Cr}^{\text {II }}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \rightarrow\left[\mathrm{Co}^{\text {II }}\left(\mathrm{NH}_{3}\right)_{5}\left(\mathrm{H}_{2} \mathrm{O}\right)\right]^{2+}+\left[\mathrm{Cr}^{\text {III }}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5} \mathrm{X}\right]^{3+/ 2+} \]

(a)$\mathrm{H}_{2} \mathrm{O}$

(b)$\mathrm{NH}_{3}$

(c)$\mathrm{Cl}^{-}$

(d)$\mathrm{N}_{3}{ }^{-}$

Answer

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Explanation

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