Multiple Choice
In the reaction 16H^+ + 2Cr_2O_7^{2-} + C_2H_5OH → 4Cr^{3+} + 11H_2O + 2CO_2, which element is reduced?
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6. Chemical Quantities & Aqueous Reactions
Calculate Oxidation Numbers
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In the redox reaction Fe + CuSO_4 → FeSO_4 + Cu, assign the correct oxidation number to iron (Fe) in FeSO_4.
A
+2
B
0
C
-2
D
+3
Verified step by step guidance1
Identify the species involved in the reaction: Fe (elemental iron), CuSO_4 (copper(II) sulfate), FeSO_4 (iron(II) sulfate), and Cu (elemental copper).
Recall that elemental iron (Fe) in its pure form has an oxidation number of 0.
In the compound FeSO_4, sulfate (SO_4) is a polyatomic ion with a charge of -2.
Since FeSO_4 is a neutral compound, the sum of the oxidation numbers must be zero. Let the oxidation number of Fe be x. Then, the equation is: \(x + (-2) = 0\).
Solve for x to find the oxidation number of Fe in FeSO_4.
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