In the standardization of `Na_(2)S_(2)O_(3)` using `K_(2)Cr_(2)O_(7)` by iodometry, the equivalent weight of `K_(2)Cr_(2)O` is

Answer

6

Explanation

`({:(Cr_2O_7^(2-)+14H^(+)+6e^(-)to2Cr^(3+)+7H_2O),(" " 2I^(-)toI_2+2e^(-)xx3):})/(Cr_2O_7^(2-)+14H^(+)+6I^(-)to2Cr^(3+)+3I_2+7H_2O)`
So eq. wt.-`("Molecular w.t.")/6`