A) \[Al\]
B) \[In\]
C) \[Ga\]
D) \[B\]
Correct Answer: D
Solution :
All these elements belong to III A group of periodic table (\[B,\] \[Al,\]\[Ga\] and In). Boron is on the top. Therefore, it has maximum ionization potential because I.P. always decreases from top to bottom in a group.
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