JEE Main Chemistry question

Which of the following is NOT a correct characteristic of halogens (F, Cl, Br, I)?

(A)Ionisation energy decreases with increase in atomic number
(B)Electronegativity decreases with increase in atomic number
(C)Electron affinity decreases with increase in atomic numberCorrect
(D)Enthalpy of fusion increases with increase in atomic number

Answer: (C)

Solution

Down Group 17, atomic radius increases while ionisation energy and electronegativity decrease monotonically, and enthalpy of fusion increases with increasing size/polarisability — statements (A), (B) and (D) all hold. However, electron affinity does NOT decrease monotonically

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Question ID VK-156549