CH-405/817

Which ordering correctly shows the variation in rates of water exchange in high-spin aqua complexes [M(OH)₆]ⁿ⁺ ?

• Co³⁺ > Co²⁺

• Co²⁺ > Cr²⁺

• Cr³⁺ > Fe³⁺

• Cu²⁺ > Cr²⁺

The Chromium(III) species formed soon after electron transfer between IrCl₆^2- and Cr(H₂0)₆²⁺ is

• Cr(H₂0)₆³⁺

• [Cr(H₂0)₅Cl]²⁺

• CrCl₆^3-

• Cr(H₂0)₃Cl₃

The reaction given below Fe(CN)₆^4- + Mo(CN)₈^3-→ Fe(CN)₆^3- + Mo(CN)₈^4- takes place by the

• inner-sphere mechanism mediated by the CN- bridge

• outer-sphere mechanism mediated by the CN- bridge

• inner-sphere mechanism with no net chemical change

• outer-sphere mechanism with no net chemical change

Hydrolysis of the purple isomer of the complex [Co(tren)(NH₃)CI]²⁺ [tren = Tris(2- aminoethyl)amine] under basic conditions results in two products. The geometry of the intermediate involved in this reaction is

• Trigonal bipyramidal

• square pyramidal

• pentagonal planar

• tetrahedral

Name the compound B -

• trans-[PtCl₂(NO₂)(NH₃]^-

• Cis-[PtCl₂(NO₂)(NH₃]^-

• trans-[PtCl₂(NH₃)₂]

• Cis-[PtCl₂(NO₂)₂]^2-