Redox Reactions...

$$One\ mole$$ of $$N_2H_4$$ loses $$10\ moles$$ of electrons to form a new compound $$Y$$. Assuming that all nitrogen appear in the new compound, what is the oxidation state of nitrogen in compound $$Y$$?

Which of the following statements is correct?

Select the compound in which chlorine is assigned the oxidation number $$+5$$.

Oxidation number of P in $$Mg_2P_2O_7$$ is?

In which of the following pairs, the oxidation states of sulphur and chromium are same?

The oxidation number of phosphorus in $$PO^{3-}_4, P_4O_{10}$$ and $$P_2O^{4-}_7$$ is?

Which one of the following statements is not correct?

It is found that V forms a double salt isomorphous with Mohr's salt. The oxidation number of V in this compound is_________.

The oxidation number of phosphorus in $$Ba(H_2PO_2)_2$$ is:

The oxidation number of phosphorus in $$Ba(H_2PO_2)_2$$ is: