Which of the following statements concerning use of the Downs Cell for the elect

Question

Which of the following statements concerning use of the Downs Cell for the electrolysis of molten sodium chloride is incorrect?

a)The pale green gas, Cl2, is liberated at the anode.

b)The anode is the positive electrode and the cathode is the negative electrode for this cell.

c)The molten sodium and gaseous chlorine products must be kept separated to prevent an explosive reaction.

d)The Downs cell is expensive to run because of the cost of construction, of electricity and of heat to melt the NaCl.

e)Although production of sodium metal by the electrolysis of aqueous NaCl is much cheaper, the electrolysis of molten NaCl is used because it gives a purer metal.

Explanation / Answer

a) is correct.

b) correct.

c) correct

d) correct

e) incorrect because electrolysis of aqueous NaCl yields hydrogen and chlorine not sodium metal and aqueous NaOH is in the solution.

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