<p>One mole of&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>N</mi><mn>2</mn></msub><msub><mi>H</mi><mn>4</mn></msub></math>&nbsp;loses 10 mole of electrons to form a new compound Y. Assuming that all nitrogen appears in the new compound, what is the oxidation number of nitrogen in Y (There is no change in the oxidation state of hydrogen)?</p>