When $NH_3$ is passed over heated $CuO$,it gets oxidized to form .................. .

Draw the structures of the following oxoacids of phosphorus:
$(i)$ Orthophosphoric acid $(H_{3}PO_{4})$
$(ii)$ Pyrophosphoric acid $(H_{4}P_{2}O_{7})$
$(iii)$ Orthophosphorus acid $(H_{3}PO_{3})$
$(iv)$ Hypophosphorus acid $(H_{3}PO_{2})$
$(v)$ Cyclotrimetaphosphoric acid $((HPO_{3})_{3})$
$(vi)$ Polymetaphosphoric acid $((HPO_{3})_{n})$

Which of the following is the anhydride of orthophosphoric acid $(H_3PO_4)$?

The oxoacid of phosphorus having the strongest reducing property is

Which of the following represents the correct order of acidic strength?

What are the products obtained when ammonia is reacted with excess chlorine?