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Q.

Which among the following elements have lowest value of Ionisation energy

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a

Pb

b

Sn

c

Si

d

C

answer is B.

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Detailed Solution

The ionisation energy of tin (Sn) is less than that or lead (Pb). It is due to the poor shielding of d- and f-electron in Pb due to which it feels greater attraction from nucleus.
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