MCQ
The correct order of the first ionization enthalpy is
- A$\mathrm{Al}>\mathrm{Ga}>\mathrm{Tl}$
- B$\mathrm{Ga}>\mathrm{Al}>\mathrm{B}$
- C$\mathrm{B}>\mathrm{Al}>\mathrm{Ga}$
- ✓$\mathrm{Tl}>\mathrm{Ga}>\mathrm{Al}$
✓
Answer
Correct option: D.
$\mathrm{Tl}>\mathrm{Ga}>\mathrm{Al}$
d
($i$) due to lanthanide contraction $\mathrm{T} \ell$ has more $I.E$. as compared to $\mathrm{Ga}$ and $\mathrm{A} \ell$
($i$) 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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