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-p-Block elements - I — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry-p-Block elements - I1 Mark
MCQ
Given below are two statements:

Statement $I$ : The decrease in first ionization enthalpy from $B$ to $Al$ is much larger than that from $Al$ to $Ga$.

Statement $II$ : The d orbitals in Ga are completely filled.

In the light of the above statements, choose the most appropriate answer from the options given below

  • A
    Statement $I$ is incorrect but statement $II$ is correct.
  • ✓
    Both the statements $I$ and $II$ are correct
  • C
    Statement $I$ is correct but statement $II$ is incorrect
  • D
    Both the statements $I$ and $II$ are incorrect
✓

Answer

Correct option: B.
Both the statements $I$ and $II$ are correct
b
The first ionization energies (as in NCERT) are as follows:

$B$ : $801\,kJ / mol$

$Al : 577\,kJ / mol$

Ga : $579\,kJ / mol$

$Ga :[ Ar ] 3 d ^{10} 4 s ^2 4 p ^1$

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