For the reaction
`3Br_(2)+6OH^(ө)-lt5Br^(ө)+BrO_(3)^(ө)+3H_(2)O`
Equivalent weight of `Br_(2)` (molecular weitht M) is

Options

A. `(M)/(2)`
B. `(M)/(10)`
C. `((M)/(2)+(M)/(10))`
D. `((M)/(6))`

Answer

C

Explanation

`Br_(2)` disproprtions (simultaneous oxidation and reduction), its equivalent weight is the sum of equivalent weights of the two half reactions.
`2e^(-)+Br_(2)rarr2Br^(ө)(x=2)` (reduction)
`Br_(2)rarr2BrO_(3)^(ө)+10e^(-)(x=10)("oxidation")`
`2x=0, 2x-12= -2`
`2x=10`
`:. Ew=(M)/(2)+(M)/(10)`