NEET-XII-Chemistry
c2022 year:2022
- #17Gadolinium has a low value of third ionisation enthalpy because of
(A)high basic character
(B)small size
(C)high exchange enthalpy
(D)high electronegativitydigAnsr: CAns : `` { }_{64} Gd =[ Xe ] 6 s ^{2} 4 f ^{7} 5 d ^{1} ``
`` Gd ^{+2} =[ Xe ] 4 f ^{7} 5 d ^{1} ``
After losing `` 5 d `` electron `` 4 f `` has maximum exchange energy so Gd has low value of Third Ionisation energy