The ligand substitution reaction between hexaaquachromium(III) ions and ethanedioate (oxalate) ions can be represented by the following equation:
[Cr(H2O)6]3+(aq)+3C2O42−(aq)→[Cr(C2O4)3]3−(aq)+6H2O(l) [\text{Cr}(\text{H}_2\text{O})_6]^{3+}(aq) + 3\text{C}_2\text{O}_4^{2-}(aq) \rightarrow [\text{Cr}(\text{C}_2\text{O}_4)_3]^{3-}(aq) + 6\text{H}_2\text{O}(l) [Cr(H2O)6]3+(aq)+3C2O42−(aq)→[Cr(C2O4)3]3−(aq)+6H2O(l)Which statement is correct about this reaction?
The coordination number of the chromium ion decreases.
The reaction is driven by a highly negative enthalpy change.
The entropy change of the reaction is large and positive.
The shape of the chromium complex changes from octahedral to tetrahedral.