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Question

Which of the following is the incorrect reason for anomalous behaviour of Lithium?

A
High polarising power of its ion
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B
Exceptionally small size of its atom
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C
Exceptionally low ionisation enthalpy
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D
High degree of hydration of its ion
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Solution

The correct option is C Exceptionally low ionisation enthalpy
Ionization energy order of Alkali metals:
Li>Na>K>Rb>Cs
So, Li has high Ionisation Enthalpy.
Therefore, the correct answer is option ‘d’.

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