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Total number of following reagents, which can be used to distinguish with visile change between SO_(2) and CO_(2) gases: FeCI_(3)-solution, Br_(2)-water, CI_(2)-wate, H_(2)O_(2), (KMnO_(4)+H_(2)SO_(4)), (strach-IO_(3)^(-)),(K_(2)Cr_(2)O_(7)+H_(2)SO_(4)),Ca(OH)_(2) |
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