In acidic medium potassium dichromate acts as an oxidant according to the equation, \[{{\operatorname{CrO}}_{7}}^{2-}+\,\,14{{H}^{+}}+6{{e}^{-}}\,\,\to \,\,2C{{r}^{3+}}\,+\,\,7{{H}_{2}}O\]. What is the equivalent weight of\[{{\operatorname{K}}_{2}}C{{r}_{2}}{{O}_{7}}\]?\[(\operatorname{mol}. wt.=M)\]
A)M
B)M/2
C)M/3
D)M/6
Correct Answer:
D
Solution :
Since it accepts\[6{{e}^{-}}\], Equivalent weight \[=\,\,\,\frac{M}{6}\].