An aqueous solution of a halogen salt of potassium reacts with the same halogen $X_2$ to give $KX_3$,a brown-coloured solution,in which the halogen exists as the $X_3^-$ ion,$X_2$ acts as a Lewis acid,and $X^-$ acts as a Lewis base. The halogen $X$ is:

Which of the given methods cannot produce $Cl_2$?

Number of $Cl=O$ bonds in chlorous acid,chloric acid and perchloric acid respectively are :

Given below are two statements:
Statement $I$: The increasing order of boiling point of hydrogen halides is $HCl < HBr < HI < HF$
Statement $II$: The increasing order of melting point of hydrogen halides is $HCl < HBr < HF < HI$
In the light of the above statements, choose the correct answer from the options given below

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

When chlorine water is exposed to sunlight,the colour change that occurs is: