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Statement - 1: First ionization energy Ge is greater than Si Statement - 2: First ionization energy Pb is greater than S…

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Statement - 1: First ionization energy Ge is greater than Si
Statement - 2: First ionization energy Pb is greater than Sn

a

Statement -1 is true Statement 2 is false

b

Statement - 1 and Statement - 2 are false

c

Both the Statements are true

d

Statement - 1 is false Statement - 2 is true

✓ Correct answer: d)

Statement - 1 is false Statement - 2 is true

Explanation

As we move down the group, the ionisation energy decreases, due to increase in atomic size, thereby, increasing the distance of the electrons from the nucleus. The first ionisation energy of lead is slightly higher than that of tin. The reason is due to lanthanide contraction.Due to higher charge density, the outer electrons are attracted more by the nucleus in lead and hence, the ionisation energy is more in the case of lead.

C > Si > Ge > Pb > Sn

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