What is the oxidation state of the underlined atom in the reaction: 
Definitions:
Experimental Error
The variability in data that cannot be attributed to the variables being studied, often resulting from unknown or uncontrollable factors.
Null Hypothesis
A hypothesis that suggests there is no statistical significance in a set of given observations, indicating no effect or relationship.
Obtained Value
The actual value measured or calculated in an experiment or analysis, often compared against a theoretical value or critical value.
Critical Value
A threshold in hypothesis testing that defines the boundary for rejecting the null hypothesis.
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