Homework Help: chemistry

Posted by write2khin on Saturday, April 10, 2010 at 8:56pm.

1) All of the following are oxidation-reduction reactions except
(a) 2Al(s) + Fe2O3(s) ---> A12O3(s) + 2Fe(s)
(b) (NH4)2Cr2O7(s) ---> Cr2O3(s) + N2(g) + H2O(1)
(c) Cu(s) + 2H2SO4(aq) ---> CuSO4(aq) + SO2(g) + 2H2O(1)
(d) Hg(NO3)2 + 4KI ---> K2HgI4(aq) +
2 KNO3(aq)
(e) 2Na(s) + 2H2O(1) --> 2NaOH(aq) +
H2(g)

chemistry - DBob222, Saturday, April 10, 2010 at 9:57pm
This is a matter of going through each equation and determining the oxidation state of each, then comparing to see if any have changed. If not, that will answer your question.
1. Al is 0 on the left and +3 on the right. Therefore, this is an oxidation/reduction equation.
etc.

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