The correct group of halide ions which can be oxidised by oxygen in acidic medium is

When a brown compound of manganese $(A)$ is treated with $HCl$,it gives a gas $(B)$. The gas,when taken in excess,reacts with $NH_{3}$ to give an explosive compound $(C)$. Identify compounds $A$,$B$,and $C$.

Which is used for sterilization of water in the water supply system of cities?

Which of the following molecules has the highest bond dissociation enthalpy?

Chlorine acts as a bleaching agent only in the presence of which of the following?

Which of the following is the strongest oxidizing agent?