• # question_answer $HBr$ and $HI$ reduce sulphuric acid, $HCl$ can reduce $KMn{{O}_{4}}$ and $HF$ can reduce [IIT 1981; MP PET 1993] A) ${{H}_{2}}S{{O}_{4}}$ B) $KMn{{O}_{4}}$ C) ${{K}_{2}}C{{r}_{2}}{{O}_{7}}$ D) None of these

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