Home Chemistry Classification of Elements and Periodicity Assertion & Reason Assertion: Energy is always required to remo…
Chemistry Classification of Elements and Periodicity Assertion & Reason Single Correct MCQ
Published on: August 12, 2026

Assertion: Energy is always required to remove electrons from an atom and hence ionization enthalpies are always negative.

Reason: The second ionization enthalpy will be lower than the first ionization enthalpy.

A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
Both A and R are false.

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The correct answer is:
D

Energy is always required to remove electrons from an atom and hence ionization enthalpies are always positive. The second ionization enthalpy will be higher than the first ionizarion enthalpy because it is more difficult to remove an electron from a positively charged ion than from a neutral atom.

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