Which of the following ammonium compounds yields nitrogen gas upon heating?

In which of the following reactions,$NO_2$ is not liberated?

Arrange the hydrides of Group $15$ elements in the increasing order of their basic strength.

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T$:
$\underline{P}Cl_3 + H_2O \longrightarrow H_3PO_3 + HCl$

What type of element is Moscovium $(Mc)$?

Dilute nitric acid on reaction with $Ag$ liberates