If $$E_{CIO_3/CIO_4}^0=0.36 V$$ and $$E_{CIO_3/CIO_2}^0=0.33 V$$ at $$300K$$.The equilibrium concentration of perchlorate ion $$(CIO_4^-)$$ which was initially $$1.0$$M in $$CIO_3^-$$ when the reaction starts to attains the equilibrium ,
$$2ClO_^- \rightleftharpoons CIO_3^-+ClO_4^-$$
Given :$$AL(0.509)=3.329$$
Correct option is A. $$0.0236M$$