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What Is the Change in the Oxidation Number of Sulfur $\rarr$

Question 4

Multiple Choice

What is the change in the oxidation number of sulfur in the following?
K₂SO₃ $\rarr$ K₂SO₄

A) decrease by three units
B) decrease by four units
C) increase by two units
D) increase by three units
E) increase by four units

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