Which of the following are dedox reactions? For thosethat are, indicate which el

Question

Which of the following are dedox reactions? For thosethat are, indicate which element is oxidized and which isreduced. For those that are not, indicate whether they areprecipitation or acid-base reactions. (a) 2 S2O32-(aq) +l2(g) --> S4O62-(aq)+ 2 l-(aq) ___ redox reaction - S is oxidied, l is reduced ___ redox reaction - l is oxidized, S is reduced ___ precipitation reaction ___ acid-base reaction (b) 2 NO3-(aq) + SO2(aq)--> 2 NO2(g) + SO42-(aq) ___ redox reaction - N is oxidized, S is reduced ___ redox reaction - S is oxidized, N is reduced ___ precipitation reaction ___acid-base reaction (c) Sr(NO3)2(aq) +H2SO4(aq) --> SrSO4(s) + 2HNO3(aq) ___redox reaction - Sr is oxidized, S is reduced ___ redox reaction - S is oxidized, Sr is reduced ___ precipitation reaction ___ acid-base reaction (d) MnCl2(aq) + Na2S(aq) --> MnS(s) +2 NaCl (aq) ___ redox reaction - Mn is oxidized, S is reduced ___ redox reaction - S is oxidized, Mn is reduced ___ precipitation reaction ___ acid-base reaction Which of the following are dedox reactions? For thosethat are, indicate which element is oxidized and which isreduced. For those that are not, indicate whether they areprecipitation or acid-base reactions. (a) 2 S2O32-(aq) +l2(g) --> S4O62-(aq)+ 2 l-(aq) ___ redox reaction - S is oxidied, l is reduced ___ redox reaction - l is oxidized, S is reduced ___ precipitation reaction ___ acid-base reaction (b) 2 NO3-(aq) + SO2(aq)--> 2 NO2(g) + SO42-(aq) ___ redox reaction - N is oxidized, S is reduced ___ redox reaction - S is oxidized, N is reduced ___ precipitation reaction ___acid-base reaction (c) Sr(NO3)2(aq) +H2SO4(aq) --> SrSO4(s) + 2HNO3(aq) ___redox reaction - Sr is oxidized, S is reduced ___ redox reaction - S is oxidized, Sr is reduced ___ precipitation reaction ___ acid-base reaction (d) MnCl2(aq) + Na2S(aq) --> MnS(s) +2 NaCl (aq) ___ redox reaction - Mn is oxidized, S is reduced ___ redox reaction - S is oxidized, Mn is reduced ___ precipitation reaction ___ acid-base reaction

Explanation / Answer

       +2                0           +2.5               -1 (a) 2 S2O32-(aq) +l2(g) --> S4O62-(aq)+ 2 l-(aq) --> redox reaction - S is oxidied, l is reduced         +5             +4                 +4           +6 (b) 2 NO3-(aq) + SO2(aq)--> 2 NO2(g) + SO42-(aq) ---> redox reaction - S is oxidized, N isreduced     +2                        +6             +2 +6 (c) Sr(NO3)2(aq) +H2SO4(aq) --> SrSO4(s) + 2HNO3(aq)                                                     precipitate -----> precipitation reaction        +2                  -2           +2    -2 (d) MnCl2(aq) + Na2S(aq) --> MnS(s) +2 NaCl (aq) ---> precipitation reaction

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