• # question_answer 46) 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.

(a) Oxidation state of hydrogen may be $+1$ or $-1\overset{+1-1}{\mathop{HCl}}\,,\overset{+1-1}{\mathop{NaH}}\,$