Complete and balance the following reactions :
(i) `P_4O_10 + PCl_5 rarr"___"`
(ii) `NH_3 + NaOCl rarr "____" + NaCl + H_2 O`
(iii) `Ca(PO_4)_3 + 4H_3PO_4 rarr"____"`
(iv) `AgCl + NH_4OH rarr "_____" + "____"`
(v) `Pb(NO_3)_2 overset (Delta)rarr PbO + "___" + "____"`
(vi) `Mg + HNO_3 rarr "____" + "____"`.