Which of the following aqueous solutions are good buffer systems ?
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0.17 M hypochlorous acid + 0.13 M perchloric acid
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0.12 M barium hydroxide + 0.28 M barium bromide
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0.25 M hydroiodic acid + 0.16 M potassium iodide
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0.29 M ammonia + 0.33 M ammonium bromide
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0.30 M sodium perchlorate + 0.27 M barium perchlorate