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Question

The correct increasing order of first ionisation energy is:



Your Answer
A

Na < K < Al < Mg 

Correct Answer
B

K < Na < Al < Mg

Your Answer
C

K < Na < Mg < Al

Your Answer
D

K < Mg < Al < Na.


Solution

The correct option is C

K < Na < Al < Mg


Ionisation energy decreases down the group, but increases from left to right in a period. So, K < Na < Al < Mg is the correct order of ionization energy.

Potassium is present in the fourth period. Sodium, aluminium and magnesium are present in the third period.

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