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

Options

A. (Molecular weight)/2
B. (Molecular weight)/6
C. (Molecular weight)/3
D. Same as molecular weight

Answer

B

Explanation

Hypo solution are used as the reducing agent with potassium dicromate solution
`K_(2)overset(+6)(Cr_(2))O_(7) = ("Molecular weight")/(6)`
`Cr_(2)O_(7)^(2-) + 14H^(+) + 6e^(-) to 2Cr^(3+) + 7H_(2)O`