Q. The rate of the following redox reaction is slowest when X is
[CoIII(NH3)5X]3+/2+ + [CrII(H2O)6]2+ → [CoII(NH3)5(H2O)]2+ + [CrIII(H2O)5X]3+/2+
(A) H2O
(B) NH3
(C) Cl–
(D) N3–
Ans: NH3
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