define oxidation and reduction (redox) in terms of oxygen/hydrogen gain/loss;
define redox in terms of electron transfer and changes in oxidation state
identify redox reactions in terms of oxygen/hydrogen, electron gain/loss and changes in oxidation state
describe the use of aqueous potassium iodide and acidified potassium dichromate(VI) in testing for oxidising agent and reducing agent from the resulting colour changes
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Definition 1