Redox Reactions and Titration

${\mathrm{KMnO}}_4$ acts as an oxidising agent in alkaline medium. When alkaline ${\mathrm{KMnO}}_4$ is treated with $\mathrm{KI}$, iodide ion is oxidised to ${{\mathrm{IO}}_{\mathrm{X}}}^{-}$. The value of $\mathrm{X}$ is _____.

How many $\mathrm{ml}$ of $0.125$ $\mathrm{M}$ ${\mathrm{Cr}}^{3+}$ must be reacted with $12.00 \mathrm{ml}$ of $0.200 \mathrm{M}$ ${{\mathrm{MnO}}_4}^{-}$ if the redox products are ${\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2-}$and ${\mathrm{Mn}}^{2+}$$?$

$25 \mathrm{ml}$  of household bleach solution was mixed with $30 \mathrm{ml}$ of  $0.50$ $\mathrm{M}$ $\mathrm{KI}$ and $10 \mathrm{ml}$ of  $4 \mathrm{N}$ acetic acid. In the titration of the liberated iodine, $48 \mathrm{ml}$ of $0.25 \mathrm{N}$ ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ was used to reach the end point. The molarity of the household bleach solution is