Iodine titration can be iodemotric or iodimetric depending on using iodine directly or indirectly is an oxidising agent in the redox titration.
a. Iodimetric titration in which a standard iodine solution is used as an oxidant and iodine is directly or indirectly titrated against a reducing agent. For example.
`2CuSO_(4)+4KJtoCu_(2)I_(2)+2K_(2)SO_(4)+I_(2)`
b. Iodimetric procedures are used for the datermination of strength of reducing agent such as thiosulphates, sulphites, arsenties adn stanous chloride etc. by titrating them against standard solution of iodine in a burette.
`2Na_(2)SO_(3)to2 NaI +Na_(2)S_(4)O_(6)`
Starch is used as indicator near the end point whilch form blue colour complex with `I_(3)^(-)`. The blue colour disappeams when there is not more of free `I_(2)` .
The volume of KI solutioin used for `CuSO_(4)` will be

Options

A. `M//8`
B. `M//4`
C. `M//2`
D. `M`

Answer

D