State one relevant observation for the following: At the anode, when molten lead bromide is electrolyzed using graphite electrodes.

Explanation

At the anode, when lead bromide is elec- trolyzed using graphite electrodes following reaction occurs at the anode during electrolysis and red brown vapours are evolved at anode.
`2Br^(-) -2e^(-) rarr 2Br`
`2Br rarr Br_2(uarr)`