For each of the following five reactions, circle the specific chemical species t

Question

For each of the following five reactions, circle the specific chemical species that is: reduced, and draw a box around the specific chemical species that is oxidized:

a) MnO2 (s) + 2 I- (aq) +4 H+ (aq) --> Mn2+ (aq) + I2 (aq) + 2 H2O (l)
b) Cd (s) + 2 NiO(OH) (s) + 2 H2O (l) --> 2 Ni(OH)2 (s) + Cd(OH)2 (s)
c) NH4+ (aq) + 2 O2 (g) --> NO3- (aq) + 2 H+ (aq) + H2O (l)
d) 2 CuFeS2 (s) + 4 O2 (g) --> Cu2S (s) + 2 FeO (s) + 3 SO2 (g)
e) 2 K2FeO4 (aq) + 3 Zn (s) --> Fe2O3 (s) + ZnO (s) + 2 K2ZnO2 (aq)

Explanation / Answer

Very confusing text. It could be about:

      -    species = elements and their oxidation states

I solve for the first interpretation. To avoid any confusion I add the oxidation states (of the involved elements).

Bold : oxidised forms

Italic : reduced formed

a)     MnO2 (s) + 2 I- (aq) +4 H+ (aq) --> Mn2+ (aq) + I2 (aq) + 2 H2O (l)

4+ 1- 2+               0

b) Cd (s) + 2 NiO(OH) (s) + 2 H2O (l) --> 2 Ni(OH)2 (s) + Cd(OH)2 (s)

0 3+ 2+ 2+

c) NH4+ (aq) + 2 O2 (g) --> NO3- (aq) + 2 H+ (aq) + H2O (l)

3-                0              5+ 2-

d) 2 CuFeS2 (s) + 4 O2 (g) --> Cu2S (s) + 2 FeO (s) + 3 SO2 (g)

       2+      2-             0 1+ 2- 4+2-

e) 2 K2FeO4 (aq) + 3 Zn (s) --> Fe2O3 (s) + ZnO (s) + 2 K2ZnO2 (aq)

                 6+                   0 3+ 2+ 2+

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