Question
Given below are two statements:
Statement-I : The second ionization enthalpy of $B,Al$ and Ga is in the order of $B > Al > Ga$.
Statement-II : The correct order in terms of first ionization enthalpy is $Si < Ge < Pb < Sn$.
In the light of the above statements, choose the correct answer from the options given below :
Options
Solution
Sol. [Key Concept: Recall the II-IE order $B > Ga > Al$ and the I-IE order of the carbon family.]
Order of II ionization energy for boron family elements is :
$$\underset{(2427KJ/mol)}{B} > \underset{(1979KJ/mol)}{Ga} > \underset{(1816KJ/mol)}{Al}$$
Order of I ionization energy for carbon family elements is :
$$\underset{(786KJ/mol)}{Si} > \underset{(761KJ/mol)}{Ge} > \underset{(715KJ/mol)}{Pb} > \underset{(708KJ/mol)}{Sn}$$
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