Chemistry
Justify the following statements:
(a) Anode is known as the oxidizing electrode.
(b) Graphite electrodes are preferred in the electrolysis of molten lead bromide.
Electrolysis
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Answer
(a) Oxidation is the loss of electrons. In an electrolytic cell the anode is the positive electrode that attracts anions. These anions give up electrons to the anode, so oxidation takes place there. Because the anode accepts electrons and thereby causes the ions to be oxidised, it is called the oxidising electrode.
(b) As graphite is unaffected by the reactive bromine vapours released at the anode hence, a graphite anode is preferred to other inert electrodes like platinum during the electrolysis of molten lead bromide.
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