The halogens which show positive oxidation states are

Explain why fluorine shows only +1 oxidation state while other halogens show higher positive oxidation state? Write chemical reaction of action of Cl_2 on excess NH_3

Give one example each in which halogens display positive oxidation states from +1 " to " +7 .

Fluorine exhibits only - 1 oxidation state whereas other halogens exhibit positive oxidation states such as +1, +3, +5, +7.

Name the halogen which does not exhibit positive oxidation state .

Which halogen forms an oxoacids that contains the halogen atom in tripositive oxidation state ?