Oxyacid of chlorine with + 5 state of the central atom is

$$\begin{gathered} {\mathrm{HClO}}_3 (\mathrm{chloric} \mathrm{acid}) \\ (+1)+\mathrm{X}+3(-2)=0 \\ (+1)+\mathrm{X}+(-6)=0 \\ \mathrm{X}-5=0 \\ \mathrm{X}=+5 \end{gathered}$$

 In Chloric acid oxidation state of Cl =+5