The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect?

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Chemistry · Redox Reactions

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Correct answer

The oxidation number of hydrogen is always +1.

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Answer 1

In all its compounds, the oxidation number of fluorine is −1.

Answer 2

An element in the free or uncombined state bears an oxidation number of zero.

Answer 3

The algebraic sum of all the oxidation numbers in a neutral compound is zero.

Answer 4

The oxidation number of hydrogen is always +1.

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