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JEE Main202329 Jan 2023Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

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

Options

  1. AStatement I is incorrect but statement II is correct.
  2. BBoth the statements I and II are correct
  3. CStatement I is correct but statement II is incorrect
  4. 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 (IE 1 ) 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. ∆ IE 1 of B and Al is greater than ∆ IE 1 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.

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