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The oxidation number of an element in a ...

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 ?

A

The oxidation number of hydrogen is always +1

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
a
Oxidation number of hydrogen is always +1 is a wrong rule since, it is +1 in hydrogen halides, -1 in hydrides and zero in `H_(2)` molecule.
All the other three statements (b), ( c) and (d) are correct
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