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Electrochemical or Galvanic or Voltaic CellsAn Electrochemical Cell is a device used to convert chemical energy (produced in a redox reaction) into electrical energy.Electrochemical Cells are also known as Galvanic or Voltaic Cells.If we take a zinc rod and place it in a container filled with copper sulphate solution heat will be produced. This happens due a spontaneous redox reaction given below:Zn(Solid) + CuSO4(Aqueous) ZnSO4(Aqueous) + Cu (Solid) depositedAs the reaction would proceed the zinc rod would get eroded ,copper particles would get deposited and solution would becom warm.It would be useful to be able to convert this chemical energy to electrical
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ElectrolysisIt is the process of decomposition of an electrolyte by the passage of electricity through its aqueous solution or molten state.Mechanism of electrolysisWhen ever an electrolyte is dissolved in water or taken in the molten state it dissociates into positive and negative ions. The positive ions are known as cations and the negative ions are known as anions.On passing electric current through the electrolyte cations move towards the cathode and anions move towards the anode.On reaching their respective electrodes these ions loose their charge. On loosing their charge they get deposited on the electrode or discharged as a gas.Let us take an example of elect
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