A) + 1
B) + 3
C) + 5
D) - 4
Correct Answer: A
Solution :
In \[\overset{\,\,\,\,\,*}{\mathop{K{{H}_{2}}P{{O}_{2}}}}\,\] \[1+2+x+(-2\times 2)=0\] \[3+x-4=0\]; \[x=+1\].
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