A solution of `I_(2)` in aqueous Kl on reaction with an aqueous solutionof `Na_(2)S_(2)O_(3)` gets decolourised. The reaction taking place here is

Options

A. `Na_(2) S_(2) O_(3)+ H_(2)O+I_(2) to Na_(2) S_(2) O_(4)+2HI`
B. `2Na_(2)S_(2)O_(3)+ I_(2) to Na_(2) S_(4) O_(6)+ 2NaI`
C. `Na_(2) S_(2)O_(2) +2H_(2) O+2I_(2) to Na_(2)S_(2)O_(5) +4HI`
D. `2Na_(2) S_(2)O_(3)+ 2H_(2)O +2I_(2) to Na_(4) S_(4) O_(8)+ 4HI`

Answer

B