The order of decreasing ionisation enthalpy in alkali metals is
(i) Na > Li > K > Rb
(ii) Rb < Na < K < Li
(iii) Li > Na > K > Rb
(iv) K < Li < Na < Rb
The order of decreasing ionisation enthalpy in alkali metals is
(i) Na > Li > K > Rb
(ii) Rb < Na < K < Li
(iii) Li > Na > K > Rb
(iv) K < Li < Na < Rb
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1 Answer
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This is a multiple choice type question as classified in NCERT Exemplar
Correct Option (iii)On moving down the group as the size increases, the nuclear charge attraction decreases. The effect of increasing size outweighs the increasing nuclear charge. Thus, ionization enthalpy decreases. The order of decreasing ionization enthalpy is,
Li>Na>K>Rb
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