Answer
$SeO_2(s)+2KOH(aq)\longrightarrow K_2SeO_3(aq)+H_2O(l)$
Work Step by Step
$SeO_2(s)+2KOH(aq)\longrightarrow K_2SeO_3(aq)+H_2O(l)$ is balanced with two moles $KOH$.
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