at 1st u mentioned in ur experiment that ""The gas produced at the cathode burns with a ‘pop’ when a sample is lit with a lighted splint. This shows that the gas is hydrogen. """" but in reality u can not collect that gas so easily and also it will not occure,,because the amount of h2 so small that you can not detect it,,and same3 distance apart is kept mainly for suitable arrangement only,,u can also made curve electode,,,, but straight electrode is easy to clear or rather to maintain........
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