The mixture used for the tips of matchsticks is:

Which of the following substances is used to prepare $UF_6$ during the enrichment process of ${}_{92}U^{235}$?

What is the color of chlorine gas?

The colour of the $X_2$ molecules of group $17$ elements changes gradually from yellow to violet down the group. This is due to
[$A$] the physical state of $X_2$ at room temperature changes from gas to solid down the group
[$B$] decrease in $HOMO-LUMO$ gap down the group
[$C$] decrease in $\pi^*-\sigma^*$ gap down the group
[$D$] decrease in ionization energy down the group

Which of the following compounds does not produce chlorine gas upon heating?

The bond energy of $Cl_2, Br_2$ and $I_2$ follows the order: