A) \[As<S<O<Se\]
B) \[Se<S<As<O\]
C) \[O<S<As<Se\]
D) \[O<S<Se<As\]
Correct Answer: D
Solution :
[d] On moving down in a group atomic radii increases due to successive addition of extra shell hence \[O<S<Se\]. Further As is in group 15 having one less electron in its p orbital hence have higher atomic radii than group 16 elements. \[i.e.,O<S<Se<As\]
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