$A$ tetra-atomic molecule $(A)$ on reaction with excess oxygen produces substance $(B)$. $(B)$ is a dehydrating agent. The substances $(A)$ and $(B)$ respectively will be:

Which of the following properties of white phosphorus are shared by red phosphorus?

In group $15$ of the periodic table,nitrogen forms only a trihalide,but other elements form pentahalides also. The reason is:

The electronegativity of a group $13$ element '$E$' is the same as that of $Ge$ (on the Pauling scale and up to one decimal point). The $CORRECT$ statements about $E^{3+}$ are:
$A$. It can act as a reducing agent.
$B$. It can act as an oxidizing agent.
$C$. $E^{3+}$ is more stable than $E^+$.
$D$. The standard electrode potential value for $E^{3+}/E$ is positive.

Which colorless gas has a smell like rotten fish?

Which of the following combines with $Fe(II)$ ions to form a brown complex?