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Q.

The first ionization energies of the elements of group-14. Follow the order 

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a

Si > C > Ge > Sn > Pb 

b

C > Si > Ge > Pb > Sn

c

C > Si > Ge > Sn > Pb

d

C < Si < Ge > Sn > Pb 

answer is C.

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Detailed Solution

i)Large decrease in ionisation potential from carbon to silicon is due to sudden increase in size of silicon atom
ii)The slight increase in the ionisation potential from Tin to lead is due to lanthanoid contraction

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