Question

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

Answer 1

your answer is (b) because.. total sum of oxidation no. is always equal to total charge on the compound in neutral compound it is zero not for all compounds.

and also the other three options are correct.

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