The reaction of concentrated $HNO_3$ with iodine produces ....

In the production of $UF_6$ required for the enrichment of ${}^{235}U$,which of the following is used?

Which of the following pairs will produce chlorine gas very rapidly upon reaction?

The strongest reducing agent among the following is:

Name two poisonous gases which can be prepared from chlorine gas.

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.