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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
The incorrect statement is
  • A
    The first ionization enthalpy of $K$ is less than that of $Na$ and $Li$
  • B
    $Xe$ does not have the lowest first ionization enthalpy in its group
  • C
    The first ionization enthalpy of element with atomic number $37$ is lower than that of the element with atomic number $38$ .
  • ✓
    The first ionization enthalpy of $Ga$ is higher than that of the $d-$block element with atomic number $30$.
✓

Answer

Correct option: D.
The first ionization enthalpy of $Ga$ is higher than that of the $d-$block element with atomic number $30$.
d
Ionization enthalpy order :

$Li > Na > K$

$He > Ne > Ar > Kr > Xe > Rn$

$Sr > Rb$

$Zn > Ga$

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