A) +6
B) +2
C) +7
D) +4
Correct Answer: A
Solution :
Formula of potassium dichromate is \[{{\overset{+1}{\mathop{K}}\,}_{2}}\overset{x}{\mathop{C}}\,{{r}_{2}}{{\overset{-2}{\mathop{O}}\,}_{7}}\] \[(+1\times 2)+2x+(-2\times 7)=0\] \[+2+2x-14=0\] \[2x=14-2\] \[2x=12\] \[x=\frac{12}{2}=+\,6\]
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