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. I

Question

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

TestHub · Accepted Answer

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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Options:

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