In the standardization of Na_(2)aS_(2)O using K_(2)Cr_(2)O_(7) by iodmetry the equivalent weight of K_(2)Cr_(2)O_(7) is

In the standardization of Na_(2)aS_(2)O using K_(2)Cr_(2)O_(7) by iodm

1.	In the standardization of Na_(2)aS_(2)O using K_(2)Cr_(2)O_(7) by iodmetry the equivalent weight of K_(2)Cr_(2)O_(7) is
Answer» `("MOLECULAR weight")//2` `("molecular weight")//6` `("molecular weight")//3` same as molecular weight Solution :`Cr_(2)O_(7)^(2-)+14H^(+)+6e^(-)rarr2Cr^(3+)+7H_(2)O` Since `K_(2)Cr_(2)O_(7)` accepts 6 electrons for its REDUCTION to `Cr^(3+)` ions `therefore` Eq. wt. `=` MOL wt/ 6