43.Which one of the following is not a buffer solution? (1) 0.8M H2S0.8M KHS (2) 2M C&H,NH2 + 2M C6H5NH3+Br (3) 3M H2CO3+ 3M KHCO3 (4) 0.05M KCIO4 + 0.05M HCIO4

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