A) 6
B) 13
C) 18
D) 24
Correct Answer: B
$ [NaOH]=0{.4}/{40{mole}/{l.};=0.1,M}; $
$ [O{H^{-}}]={10^{-1}}M $ , $ [{H^{+}}]={10^{-13}}M $ , $ pH=13 $
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