JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties
Given below are two statements :
Statement (I) : The first ionization energy of Pb is greater than that of Sn .
Statement (II) : The first ionization energy of Ge is greater than that of Si .
In the light of the above statements, choose the correct answer from the options given below :
- A Statement I is false but Statement II is true
- B Statement I is true but Statement II is false
- C Both Statement I and Statement II are true
- D Both Statement I and Statement II are false
Answer & Solution
Correct Answer
(B) Statement I is true but Statement II is false
Step-by-step Solution
Detailed explanation
First ionization energy of Lead \(=715 \mathrm{~kJ} \mathrm{~mol}^{-1}\) First ionization energy of Tin \(=708 \mathrm{~kJ} \mathrm{~mol}^{-1}\) \(\left(\mathrm{IE}_1\right)\) of Lead is greater than that of Tin due to ineffective shielding of d - and f -electrons. Therefore…
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