p-Block Elements (Group 13 & 14)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Statement I is false but Statement II is true
2. Both Statement I and Statement II are false
3. Both Statement I and Statement II are true
4. Statement I is true but Statement II is false

Answer

(4) Statement I is true but Statement II is false

Solution

First IE (kJ mol-1): Si 786, Ge 762, Sn 709, Pb 716

I: Pb>Sn (poor shielding by 4f, 5d electrons) – true

II: Ge<Si – false

Answer: (4)