Q.

Select the correct statement about ionization enthalpy

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a

It is highest for noble gas atom in every period.

b

It is the lowest for alkali metal in every period.

c

Down a group, it always decreases.

d

All are correct.

answer is D.

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Detailed Solution

Ionization potential increases across the period since effective nuclear charge increasesIonization potential decreases down to the group since availabilty of electron in the valence shell increases
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