In the reaction $4HNO_3 + P_4O_{10} \to 4HPO_3 + x$,the product $x$ is

$Pb + \text{Dil. } HNO_3 \xrightarrow{\text{Warm}} P + Q\uparrow + H_2O$
Incorrect statement for $Q$ is

Which statement is not correct for nitrogen?

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

Pure concentrated $HNO_3$ makes iron passive as the surface is covered with a protective layer of:

What are the boiling points of nitrogen and oxygen gases?