Identify the strongest oxoacid of halogen from the following.

Among the following,the number of compounds that can react with $PCl_5$ to give $POCl_3$ is $O_2, CO_2, SO_2, H_2O, H_2SO_4, P_4O_{10}$.

Arrange the following in the order of property indicated for each set:
$(i)$ $F_{2}, Cl_{2}, Br_{2}, I_{2}$ - increasing bond dissociation enthalpy.
$(ii)$ $HF, HCl, HBr, HI$ - increasing acid strength.
$(iii)$ $NH_{3}, PH_{3}, AsH_{3}, SbH_{3}, BiH_{3}$ - increasing base strength.

The bond dissociation energies of $F_2, Cl_2, Br_2$ and $I_2$ are $155, 244, 193$ and $151 \ kJ \ mol^{-1}$ respectively. Which of these has the weakest bond?

The reaction of concentrated $H_2SO_4$ with $KI$ does not produce $HI$ because........

What is the product formed when concentrated $HNO_3$ reacts with iodine?