The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is incorrect in this respect?

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The oxidation number of hydrogen is always +1

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

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

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

answer is A.

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Detailed Solution

Oxidation number of hydrogen is always +1 is a wrong rule since, it is +1in hydrogen halides, -1 in hydrides and zero in H2 molecule.

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