Question

The number of compounds in which oxidation state of halogen is less than $+5$ is_____.
i. Hypochlorous acid
ii. Chlorous acid
iii. Bromic acid
iv. Periodic acid
v. Hypoiodous acid
vi. Perchloric acid

Answer 1

Answer: 3

	Compound	Formula	Oxidation state of halogen
i	Hypochlorous acid	$HClO$	$+1$
ii	Chlorous acid	$HCl{O}_2$	$+3$
iii	Bromic acid	$HBr{O}_3$	$+5$
iv	Periodic acid	$HI{O}_4$	$+7$
v	Hypoiodous acid	$HIO$	$+1$
vi	Perchloric acid	$HCl{O}_4$	$+7$