Which of the following is false?

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Cr2+(g) ion has greater magnetic moment as compared to Co3+(g)

The magnitude of ionisation potential of iron anion (monoanion) would be equal to electron gain enthalpy of iron.

Lanthanoids contraction is cause of lower IE of Pb than Sn.

If successive ionisation energy are 332, 738, 849, 4080, 4958 (in kJ/mol). Then this element can be of 15th group.

answer is .

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Detailed Solution

are false but (2) is true, (2) Fe+e⊖⟶ΔegHΘFe⊖FeΘ⟶IE⟶FeΘ+eΘ So ionisation energy of Fe⊖ is equal ΔegHΘ of Fe. (3) Pb have more ionisation potential than Sn due to poor shielding of 4f-orbital.(4) There is a large jump in IE1 → IE2 → IE3 but there is small jump in IE4 → IE5. Hence number of valence electrons in given element is 3. Thus, from data of IE thus element corresponds to 13 group.

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