The oxidation number of an element in

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?

(i) The oxidation number of hydrogen is always +1.

(ii) The algebraic sum of all the oxidation numbers in a compound is zero.

(iii) An element in the free or the uncombined state bears oxidation

number zero.

(iv) In all its compounds, the oxidation number of fluorine is – 1.

Solution:

Option (i) The oxidation number of hydrogen is always +1 is the answer.

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