$A$ mixture of ammonia and air at about $800\,^{\circ}C$ in the presence of $Pt$ gauze forms:

Which is the correct statement for the given acids?

The temperature required for electrolysis is maximum for which of the following hydrides?

On reaction of $Lead$ $Sulphide$ with dilute nitric acid,which of the following is not formed?

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

When a brown compound of manganese $(A)$ is treated with $HCl$,it gives a gas $(B)$. The gas taken in excess,reacts with $NH_3$ to give an explosive compound $(C)$. Identify compounds $A$,$B$,and $C$.