1.

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.

Answer»

(i) Oxidation number of hydrogen is -1 in metal hydrides like NaH.



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