The diagram shows the electrolysis of concentrated aqueous sodium chloride using inert electrodes.
Which substances are produced at the electrodes?
1 )
anode: colourless gas / cathode: colourless gas
2 )
anode: colourless gas / cathode: green gas
anode: green gas / cathode: colourless gas
4 )
anode: green gas / cathode: green gas
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