Which one of the following is/are buffer solution(s)?

1.	Which one of the following is/are buffer solution(s)?
Answer» `0.8 M H_2S + 0.8 M KHS ` <BR>` 2 M C_6 H_5 NH_2 +2 M C_6H_5 NH_3 Br` ` 3 M H_2CO_3 +3M KHCO_3` ` 0.05 M KCIO_4 +0.05 M HCIO_4` SOLUTION :Strong ACID and its salt with S.B cannot act as buffer

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