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The second ionisation enthalpy of which ...

The second ionisation enthalpy of which of the following alkaline earth metals is the highest ?

A

Ba

B

Mg

C

Ca

D

Be

Text Solution

Verified by Experts

The correct Answer is:
D
As all members of the given options belongs to the same group, therefore, size will decide the amount of 2nd ionisation energy.
`because IE prop (1)/("Size")`
Thus, smaller is the size, more is the consation energy. Therefore, Be has highest second ionisation enthalpy.
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