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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 the 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 fluorine is -1.

Text Solution

Verified by Experts

The correct Answer is:
A
Oxidation number of hydrogen may be +1 to -1 or 0 . For example, in HX it is +1, in hydrides (MH), it is -1 and in `H_(2)` it is 0.
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