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

High polarising power of its ion

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Exceptionally small size of its atom

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Exceptionally low ionisation enthalpy

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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:
$L i > N a > K > R b > C s$
So, $L i$ has high Ionisation Enthalpy.
Therefore, the correct answer is option ‘d’.

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

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

The correct option is C Exceptionally low ionisation enthalpy
Ionization energy order of Alkali metals:
$L i > N a > K > R b > C s$
So, $L i$ has high Ionisation Enthalpy.
Therefore, the correct answer is option ‘d’.