1. Give the oxidation number for the specified atom in the following compounds.

Question

1. Give the oxidation number for the specified atom in the following compounds.

a) Aluminum in Al2O3

b) Phosphorus in phosphoric acid, H3PO4

c) Chromium in dichromate ion, Cr2O7^2-

2. Given the following reaction between iron(II) with permanganate ion in an acidic solution:

5Fe^2+ (aq) + MnO4^- (aq) + 8H^+ (aq) --> 5Fe^3+ (aq) + Mn^2+ (aq) + 4H2o (l)

Which atoms experience a change in oxidation number? Identify which compound is reduced (oxidizing agen) and which compound is oxidized (reducing agent).

Explanation / Answer

1.

a. Al = 3+ ; O = 2- because: (3*2) - (2*3) = 0

b. H = 1+ ; O = 2- ; P = 5+ because: (1*3) + (5*1) - (2*4) = 0

c. O = 2- ; Cr = 6+ because (6*2) - (2*7) = -2

Regards!!

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