Among $P_2O_5$,$As_2O_3$,$Sb_2O_3$,and $Bi_2O_3$,the most acidic oxide is

Which of the nitrogen oxides is obtained when ammonium nitrate is heated?

Superphosphate of lime is

What is formed when ammonia reacts with excess chlorine gas?

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 $((HPO_{3})_{n})$

Why does $NO_2$ dimerise?