The mixed anhydride of nitrogen is

Which of the following statements is not valid for oxoacids of phosphorus?

Ammonia is liberated in the reaction of

Heating of $(NH_4)_2Cr_2O_7$ releases a gas. Which of the following also produces the same gas?

Which of the following compounds releases nitrogen dioxide $(NO_2)$ upon heating?

When a brown compound of manganese $(A)$ is treated with $HCl$,it gives a gas $(B)$. The gas taken in excess,reacts with $NH_3$ to give an explosive compound $(C)$. Identify compounds $A$,$B$,and $C$.