Given below are two statements: Statement I : The decrease in fir… - Vidyadip

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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