JEE Main 2026 Chemistry question
Given below are two statements: Statement (I): The first ionisation enthalpy of the elements Na, Mg, Cl and Ar follows the order Na > Mg > Cl > Ar. Statement (II): Among Ca, Al, Fe and B, the third ionisation enthalpy is very high for Ca. In the light of the above statements, choose the correct answer from the options given below:
Answer: (D)
Solution
IE₁ actually increases as Na < Mg < Cl < Ar across the period, so Statement I is false. Ca (…4s²) loses its two 4s electrons
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