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Question
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?
Options
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.
Solution
The oxidation number of hydrogen is always +1.
Explanation:
Oxidation number of hydrogen is – 1 in metal hydrides like \[\ce{NaH}\].
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