A) +7
B) +5
C) +6
D) +4
Correct Answer: C
Solution :
\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] \[(+1\times 2)+2x+(-2\times 7)=0\] \[+2+2x-14=0\] \[2x=14-2\] \[2x=12\] \[x=\frac{12}{2}=+6\]
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