Answer:
(a) Properties of halogen (group-17)
(i) Reactivity
of halogen decreases down the group.
(ii) The higher
oxides of halogen tend to be more stable than the lower oxides.
(iii) Fluorine
shows valency one only. Other elements show valency 1, 3, 5, 7.
(iv) Melting
points and boiling points of group -17 elements increase down the group.
(v) Fluorine
forms only two oxide 
while other elements form
many oxides.
(vi) Halogens
react with metals to form ionic halide 
(vii) Halogens combine
among each other to give inter halogen compounds.
e.g. 
A =
larger halogen
X =
smaller halogen
(b) 
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