Hydrogen has a +1 oxidation number in all its compounds?
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Hydrogen has an oxidation number of +1 in most compounds. The major exception is when hydrogen is combined with metals, as in N a H \ce{NaH} NaH or L i A l H X 4 \ce{LiAlH4} LiAlHX4. In these cases, the oxidation number of hydrogen is −1 .
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