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GK QUESTION#3153

Identify the correct statement about first ionisation enthalpy.

Statement A: It is the molar energy required to remove the most loosely bound electron from each isolated gaseous ground-state atom.

Statement B: It generally increases down a group and decreases across a period from left to right.

  1. AOnly Statement B is correct
  2. BOnly Statement A is correctCorrect answer
  3. CBoth Statements A and B are correct
  4. DBoth Statements A and B are incorrect
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Answer

B. Only Statement A is correct

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Explanation

First ionisation enthalpy is the molar energy required to remove the most loosely bound electron from each isolated gaseous ground-state atom. It generally increases across a period and decreases down a group, with exceptions. The trends in statement B are reversed.

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