A) -1
B) 0
C) -7
D) + 7
Correct Answer: D
Solution :
\[\overset{*}{\mathop{HCl{{O}_{4}}}}\,\] \[1+x-2\times 4=0;\,\,1+x-8=0\] \[x=8-1=+7\] oxidation state.
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