Q.

Select proper graph of 13th group ionization energy vs. its elements

Moderate

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answer is C.

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Detailed Solution

Graph C of 13th group ionization energy vs. its elements.

Ionization enthalpy often drops as you move down a group due to an increase in atomic size and shielding, as seen in Graph C.

As a result, the ionization enthalpy changes from B to Al as one descends group 13. However, Ga's ionization enthalpy is larger than Al's.