A) 0
B) 2
C) 3
D) 5
Correct Answer: C
Solution :
\[C{{r}_{2}}{{O}_{7}}^{2-}+3{{e}^{-}}\to C{{r}^{3+}}\]. In this reaction three electrons are required for the reduction of \[C{{r}_{2}}O_{7}^{2-}\]into \[C{{r}^{3+}}\].
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