What is the sum of the oxidation states in the following species H₂SbO₃-?

Name: What is the sum of the oxidation states in the following species H₂SbO₃-?
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Question

Quizplus · Accepted Answer

Let x be the oxidation state of Sb. 
The oxidation states of O and H are -2 and +1, respectively. 
Therefore, 
-2(3) + x + (-1) = -1 (charge of the ion)
-6 + x - 1 = -1
x = +4
The sum of the oxidation states is:
(+1) + (+4) + (-6)(3) = -1
Thus, the best choice is B, which is -1.

What Is the Sum of the Oxidation States in the Following