When concentrated $H_2SO_4$ is heated with $KNO_3$,brown fumes are evolved. These fumes are due to:

What are the products obtained when ammonia is reacted with excess chlorine?

Which of the following reactions gives nitrogen $(II)$ oxide $(NO)$ as one of the products?

Rationalize the given statements and provide chemical reactions:
$1$. Lead $(II)$ chloride reacts with $Cl_2$ to give $PbCl_4$.
$2$. Lead $(IV)$ chloride is highly unstable towards heat.
$3$. Lead is known not to form an iodide,$PbI_4$.

Which of the following is the correct decreasing order of bond angles in the hydrides of group $15$ elements?

In $P_4O_6$,the number of oxygen atoms attached to each phosphorus atom is .......