Select the group where EN increases down the group
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a
F, Cl, Br
b
Li, Na, K
c
Ca, Sr, Ba
d
Zn, Cd, Hg
answer is D.
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Detailed Solution
Zn, Cd and Hg belong to 3d, 4d and 5d series of transition elements (group 12).Due to imperfect screening effect of d and f-orbitals in transition elements, EN deceases down the group 12.