OCR Advanced GCE in Chemistry/Ligands and complexes/Answers

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1. Monodentate ligands - Donate one pair of electrons to the central metal ion e.g. H2O, NH3, CO, Cl-

2. 2

3. cis-platin is used as an anti-cancer drug. tran-platin does not bind to DNA as effectively as the cis version

5. 180 degrees

6. Shine polarised light through the samples and if they are different optical isomers the plane of the polarised light will be opposite. If the samples are a mixture of both forms then the plane of polarisation will not change as they will cancel each other out.