In the electrolytic refining of Zinc, ______.
the impure metal is at the cathode.
graphite is at the anode.
acidified zinc sulphate is the electrolyte.
the metal ion gets reduced at the anode.
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A red solid is insoluble in water. However, it becomes soluble if some KI is added to water. Heating the red solid in a test tube results in liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is