PLEASE HELP ME, which element is oxidized and which is reduced?
a. 2KNO3(s ) ---> 2KNO2(s ) + O2(g)
b. H2(g) + CuO(s )---->Cu(s ) + H2O(l )
c. NaOH(aq) + HCl(aq) ----?NaCl(aq) + H2O(l )
d. H2(g) + Cl2(g)---->2HCl(g)
e. SO3(g) + H2O(l )---->H2SO4(aq
by 
simpli_icity
ANSWERS: 1
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Well, the word tells the answer. Your question looks a little confusing, but where did the oxygen's go? Wherever they went, that element became oxidised. The other one became reduced. Looks like copper became reduced in one of them. If this isn't homework, I'd help you, but you should follow the chemical reaction, otherwise you are cheating. Look at the first one. After the chemical reaction, oxygen was separate to the metal. So you tell me, is the potassium reduced or oxidised?
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