When $KBr$ is treated with conc. $H_2SO_4$,a reddish-brown gas is evolved. The evolved gas is:

Which of the following is the correct order of thermal stability of hydrogen halides $(H - X)$?

Match the following interhalogen compounds with their corresponding physical properties:

Column-$I$	Column-$II$
$(a) IBr$	$(i)$ Orange solid
$(b) ClF_3$	$(ii)$ Yellow-green liquid
$(c) BrF_3$	$(iii)$ Black solid
$(d) ICl_3$	$(iv)$ Colorless gas

Which of the following is formed when potassium iodide is heated with concentrated $H_2SO_4$?

Iodine exists in which form in iodised salt?

Select the correct set of species which cannot react with water but react with $NaOH$:
$(i) \, NO_2$ $(ii) \, P_4$ $(iii) \, Al$ $(iv) \, I_2$