A) +4 to +2
B) +5 to +3
C) +6 to +3
D) +7 to +2
Correct Answer: C
Solution :
\[\overset{+6}{\mathop{{{K}_{2}}C{{r}_{2}}{{O}_{7}}}}\,+3S{{O}_{2}}+{{H}_{2}}S{{O}_{4}}\to \] \[{{K}_{2}}S{{O}_{4}}+\overset{\,\,\,\,\,+3\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{r}_{2}}{{(S{{O}_{4}})}_{3}}}}\,+{{H}_{2}}O\] In this reaction chromium change from + 6 to +3 oxidation state.
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