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Q.

Transition elements have higher enthalpy of atomisation than alkali metals due to

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a

Stronger metallic bond in transition elements

b

Participation of ns and (n – 1)d electrons in bond formation in alkali metals

c

Larger size of transition elements

d

High electropositive nature of transition elements

answer is C.

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Detailed Solution

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Transition elements have high effective nuclear charge and a large number of valence electrons. Therefore, they form very strong metallic bonds which results in high enthalpies of atomisation.

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Transition elements have higher enthalpy of atomisation than alkali metals due to