The pH value of which of the following is not equal to one?

Question

0.05 M $H_2SO_4$

0.1 M $HNO_3$

$50 \, \text{cm}^3$ of 0.4 M $HCl$ + $50 \, \text{cm}^3$ of 0.2 M $NaOH$

0.1 M $CH_3COOH$

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