Oxidation number of an element in free state is:
Correct answer: C. zero
- A. Negative
- B. positive
- C. zero
- D. +/-1
Explanation
In a free state, an element exists in its elemental form, meaning it consists of individual atoms of that element. In this state, the oxidation number of the element is always zero. The oxidation number, also known as the oxidation state, is a number that represents the hypothetical charge an atom would have if all its bonds were 100% ionic.
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Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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