The gas which is absorbed by ferrous sulphate solution giving blackish brown colour is

Give the preparation of ammonia. Discuss the physical and chemical properties of ammonia. Give the uses of ammonia.

Which one of the following hydrides is least stable?

The number of $P-O-P$ bridges in the structures of phosphorus pentoxide $(P_4O_{10})$ and phosphorus trioxide $(P_4O_6)$ are respectively ....

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,$PbI_4$.

How is nitrogen prepared in the laboratory? Write the chemical equations of the reactions involved.