In the reaction of sodium thiosulphate with `I_(2)` in aqueous medium, the equivalent mass of sodium sulphate

Options

A. molar mass of sodium thiosulphate
B. the average of molecular masses of `Na_(2)S_(2)O_(3)` and `I_(2)`
C. half the molecular mass of sodium thiosulphate
D. molar pass of sodium sulphate `X_(2)`

Answer

C

Explanation

`2Na_(2)S_(2)O_(3)(5H_(2)O)+I_(2)to2NaI+Na_(2)S_(4)O_(6)`
`2S_(2)O_(3)^(2-)toS_(4)O_(6)^(2-)+2e^(-)`
`:.` Eq, mass of `Na_(2)S_(2)O_(3).5H_(2)O = ("Mol mass")/(1)`
`=(248)/(1)=248`