Which of the following solution will have maximum value of pH?

Which of the following solution will have maximum value of pH?

A
$50 mL$ of $0.1 MHCl + 50 mL$ of $0.1 MNaOH$
B
$40 mL$ of $0.1 MHCl + 60 mL$ of $0.1 MNaOH$
C
$60 mL$ of $0.1 MHCl + 40 mL 0.1 MNaOH$
D
$50 mL$ of $0.1 {MH}_{2} {SO}_{4} + 100 mL$ of $0.1 MNaOH$

Solution:

The solution b will contain excess of NaOH and thus its pH will be greater than seven and will be maximum amongst the given choices.

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