Chemistry - Redox Reactions Question with Solution | TestHub

'a' moles of $O_3$ allowed to react with excess of KI solution buffered with a borate buffer. Liberated iodine required 200 mL of decimolar ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ solution for complete reaction. Value of ' $1000\times a$ ' is: ( $\mathrm{I}=127,\mathrm{K}=39,\mathrm{H}=1,\mathrm{S}=32,\mathrm{O}=16$,)