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Question

The $1^{\text{st}\text{~}}$ ionization enthalpy for Mg is $+ 737\text{ }kJ/mol$. The most probable estimated value of the $2^{\text{nd}\text{~}}$ ionization enthalpy of Mg is

Options

A.$- 906\text{ }kJ/mol$
B.$- 856\text{ }kJ/mol$
C.$+ 1450\text{ }kJ/mol$
D.$+ 590\text{ }kJ/mol$

Solution

Sol. [Key Concept: ${IE}_{2} > {IE}_{1}$ always, and the jump is moderate (no core is broken for Mg), so the reasonable positive estimate is $+ 1450$ kJ/mol.]

Since successive ionization energy increases thus ${IE}_{2}(Mg) > {IE}_{1}(Mg)$

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