1(i)
X and Y are diatomic elements. X is less reactive than Y.
What are elements X and Y?
- (a)X - chlorine, Y - iodine
- (b)X - fluorine, Y - nitrogen
- (c)X - iodine, Y - bromine
- (d)X - oxygen, Y - nitrogen
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X - iodine, Y - bromine
Reason — Halogens exist as diatomic molecules and their chemical reactivity decreases on moving down the group. As iodine lies below bromine in Group 17, iodine is less reactive than bromine. Hence, X is iodine and Y is bromine.