- Exam
- JEE Main
- Year
- 2023
- Date
- 29 January
- Shift
- Evening Shift
- Subject
- Chemistry
- Chapter
- Classification of Elements and Periodicity in Properties
JEE Main 2023 · 29 January · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties
Given below are two statements: Statement I: The decrease in first...
Given below are two statements:
Statement I: The decrease in first ionization enthalpy from to is much larger than that from to .
Statement II: The d orbitals in are completely filled.
In the light of the above statements, choose the most appropriate answer from the options given below
Options
- AStatement I is incorrect but statement II is correct.
- BBoth the statements I and II are correct
- CStatement I is correct but statement II is incorrect
- DBoth the statements I and II are incorrect
Correct answer
B. Both the statements I and II are correct
Step-by-step solution
First ionization enthalpy (IE1) of B, Al, Ga are 801, 577 and 579 kJ/mol respectively.
As decrease in first ionization enthalpy is much larger from B to Al. of B and Al is greater than of Al and Ga. So, the statement I is correct.
This is due to completely filled d-orbitals in Ga and d-electron have low screening effect to compensate the increase in nuclear charge. So, The statement II is also correct.
Hence, the correct option is B.