One mole of $N_2H_4$ loses 10 mole electrons to form a new compound Y. Assuming that all the N2 appears in new compound, what is the oxidation state of Nitrogen in Y? (There is no change in the oxidation state of H)

Question

$\begin{array}{1 1} (a)\;+2 \\ (b)\;+3 \\ (c)\;+1 \\ (d)\;0 \end{array} $