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Q.

The least stable ion amongst the following is

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a

Question Image

b

Question Image

c

Question Image

d

Question Image

answer is B.

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Detailed Solution

If one electron is added to Be atom then it will convert as Question Imageion. The electronic configuration of Question ImageisQuestion Image. In the valency shell, 2p orbital has one unpaired electron  

Question Imageion to be least stable amongst given all ions. 

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The least stable ion amongst the following is