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Question:

If the IP of Na is 5.48 eV, the ionisation potential of K will be: 4.34 eV, Same as that of Na, 10.88 eV, 5.68 eV

4.34 eV

10.88 eV

Same as that of Na

5.68 eV

Solution:

Ionisation potential decreases down the group so ionisation potential of K is lesser than that of Na