Question: need help please, the answer i have clicked is wrong. Which of the following is a buffer solution? Select all that apply. 0.40MHIO with 0.0045NaIO

need help please, the answer i have clicked is wrong.

Which of the following is a buffer solution? Select all that apply. 0.40MHIO with 0.0045NaIO 0.34MHNO3 with 0.15MNH3 0.15MCH3COOH and 0.05MNaOH 0.10MHCl with 0.05MNaF

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