question_answer 1)

  Assertion (A): Electron gain enthalpy becomes less negative as we go down the group. Reason (R): Size of the atom increases on going down the group and the added electron would be farther from the nucleus. (a) Assertion and Reason both are correct statments but Reason is not correct explanation for Assertion. (b) Assertion and Reason both are correct statements and Reason is correct explanation for Assertion. (c) Assertion and Reason both are wrong statements. (d) Assertion is wrong statement but Reason is correct statement.

Answer:

  (b) On moving down the group, the electron gain enthalpy becomes less negative because on moving down the group the atomic size increases and the added electron lies away from the nucleus.