A) 7.01
B) Between 7 and 8 million years ago
C) Between 9 and 10 million years ago
D) Greater than 10
Correct Answer: B
$ {10^{-7}}MNaOH $ means $ [O{H^{-}}]={10^{-7}} $ ; $ pOH=7 $
$ pH=14-7=7 $
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