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AP EAMCET202018 Sep 2020Morning ShiftChemistryRedox ReactionsActual

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? 1. The oxidation number of hydrogen is always +1. 2. The algebraic sum of all the oxidation numbers of all elements in a compound is zero. 3. An element in the free or the uncombined state bears oxidation number zero. 4. In all its compounds, the oxidation number of fluorine is -1.

Options

  1. A1
  2. B2
  3. C3
  4. D4

Correct answer

A. 1

Step-by-step solution

Oxidation number of hydrogen is usually +1 compounds with more electrongative atoms (as in ( H ₂ O )) is +1. But in alkali metal hydride like lithium hydride of the molecule where the oxidation state of hydrogen atom (=-1 )

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