Pure nitrogen can be prepared from

In which of the following reactions is phosphine $(PH_3)$ $NOT$ produced?

Identify the correct orders from the following with respect to the property associated with:
$A$. $NH_3 > PH_3 > AsH_3 > SbH_3$ - Bond Angle
$B$. $NH_3 > PH_3 > AsH_3 > SbH_3$ - Basic Character
$C$. $PH_3 > AsH_3 > SbH_3 > NH_3$ - Thermal stability
$D$. $SbH_3 > NH_3 > AsH_3 > PH_3$ - Boiling point

The moisture present in ammonia can be removed by using which of the following?

Discuss the reactivity of group-$15$ elements with metals.

For which element will the inert pair effect not be observed?