Which are true for polarography?   I         Polarography is amperometry conducted with a dropping Hg electrode. II        The diffusion current in the plateau region of the polarographic wave is proportional to the concentration of the analyte and is used for quantitative analysis. III      The half-wave potential for maximum current is characteristic of a given analyte in a given medium and can be used for qualitative analysis for the analyte. IV      Fresh Hg drops give reproducible results. V        Polarography is used to primarily to study oxidations Hg may reduce when studying reductions. A.I, III, and IV B. II, III, and V C. I and V D. III, IV, and V E. II, III, and IV

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Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.