Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Given below are two statements :
Statement I : The decrease in first ionisation enthalpy from B to Al is much larger than that from Al to Ga
Statement II : The 
-orbitals in Ga are completely filled.
choose the most appropriate answer from the options given below :
Text Solution
Verified by ExpertsThe correct answer is:
A
The decrease in first ionisation enthalpy from 
to Al is associated with increase in size. The
discontinuity between Al and Ga is due to low screening effect of 
-electrons.
B | Al | Ga | |
I Ionisation enthalpy | 801 | 577 | 579 |
In Ga : [Ar] 
-orbitals in Ga are completely filled.
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