The oxidation of chromium in Cr2O7−2?
A. +4
B. +5
C. +6
D. +7
Correct Answer:
Option C = +6
Explanation
2 atoms of Cr,
7 X -2 atoms of O
2Cr – 14 = -2
2Cr = -2 + 14
2Cr = 12
Cr = 6
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