A) \[Na,K,Be\]
B) \[K,Na,Be\]
C) \[K,Be,Na\]
D) \[Be,Na,K\]
Correct Answer: B
Solution :
The first ionisation potential generally increases in a period from left to right and decreases in a group from up to down. Thus, the correct order of first ionisation potential is \[K<Na<Be\]
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