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Q. Second-order rate constant for the reaction between [Co(NH3)5X]n+ (n = 3 for X = NH3 and H2O; n = 2 for X = Cl–) and [Cr(H2O)6]2+ at room temperature varies with the X as
(A) NH3 > H2O > Cl– (B) Cl– > H2O > NH3
(C) NH3 > Cl– > H2O (D) H2O > NH3 > Cl–
Ans: Cl- > H2O > NH3
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