Multiple Choice
What is the oxidation number of arsenic in H₂AsO₄⁻?
6. Chemical Quantities & Aqueous Reactions
Calculate Oxidation Numbers
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What is the oxidation state of the central metal in [Cr(en)3]Cl3?
A
+1
B
+3
C
0
D
+2
Verified step by step guidance1
Identify the components of the complex [Cr(en)3]Cl3. The complex consists of a central metal ion, Cr, and ligands, en (ethylenediamine), along with counter ions, Cl3.
Understand that ethylenediamine (en) is a neutral ligand, meaning it does not contribute to the overall charge of the complex.
Recognize that the chloride ions (Cl-) are counter ions and each carries a charge of -1. Since there are three chloride ions, they contribute a total charge of -3 to the complex.
Set up an equation to find the oxidation state of the central metal, Cr. Let x be the oxidation state of Cr. The equation is: x + 0 (from en) + (-3) (from Cl3) = 0, where 0 is the overall charge of the complex.
Solve the equation for x to determine the oxidation state of Cr. Rearrange the equation to find x: x = 3.
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