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Trend in Ionisation Enthalpy

Which transit...

Question

Which transition involves maximum amount of energy?

M^{-} (g) ⟶ M (g) + e

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M^{-} (g) ⟶ M^{+} (g) + 2 e

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M^{+} (g) ⟶ M^{2 +} (g) + e

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M^{2 +} (g) ⟶ M^{3 +} (g) + e

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Solution

The correct option is B $M^{2 +} (g) ⟶ M^{3 +} (g) + e$
Option D is correct, it requires maximum energy as $M^{2 +} \to M^{3 +}$

After the removal of $2 e^{-}$ the nuclear charge per $e^{-}$ increases, due to which high energy is required to remove $3 e^{-} .$

We also know that successive ionization energy is more so when we are removing the electron from $M^{2 +}$ then it will be $I . E_{3} .$

We know that $I . E_{3} > I . E_{2} > I . E_{1}$

So, option D is correct.

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