JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties
The correct order of the first ionization enthalpy is _______.
- A \(\mathrm{Al}>\mathrm{Ga}>\mathrm{Tl}\)
- B \(\mathrm{Ga}>\mathrm{Al}>\mathrm{B}\)
- C \(\mathrm{B}>\mathrm{Al}>\mathrm{Ga}\)
- D \(\mathrm{Tl}>\mathrm{Ga}>\mathrm{Al}\)
Answer & Solution
Correct Answer
(D) \(\mathrm{Tl}>\mathrm{Ga}>\mathrm{Al}\)
Step-by-step Solution
Detailed explanation
(\(i\)) due to lanthanide contraction \(\mathrm{T} \ell\) has more \(I.E\). as compared to \(\mathrm{Ga}\) and \(\mathrm{A} \ell\) (\(ii\)) due to scandide contraction Ga has more \(I.E\). as compared to \(\mathrm{A} \ell\)
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