Multiple Choice
What is the oxidation state of an individual bromine atom in NaBrO_3?
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Calculate Oxidation Numbers
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is the oxidation state of iodine in the ion IO_3^-?
A
-1
B
+1
C
+3
D
+5
Verified step by step guidance1
Identify the oxidation state of oxygen in the ion IO_3^-. Oxygen almost always has an oxidation state of -2 in compounds.
Let the oxidation state of iodine be x. Since there are three oxygen atoms, the total oxidation state contributed by oxygen is 3 \times (-2) = -6.
The overall charge of the ion IO_3^- is -1. Set up the equation for the sum of oxidation states: x + (-6) = -1.
Solve the equation for x: x - 6 = -1, so x = -1 + 6.
Calculate x to find the oxidation state of iodine, which will be +5.
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