A) \[K>Na>Li\]
B) \[Be>Mg>Ca\]
C) \[B>C>N\]
D) \[Ge>Si>C\]
Correct Answer: B
Solution :
First ionisation potential, usually, increases across a period from left to right and decreases across a group from up to down. Therefore, \[Be>Mg>Ca\]represents the correct order of first I.P.
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