MHT CET Chemistry question

The first ionisation enthalpies of the lanthanoids are around ... A ..., the second about ...B... comparable with those of ...C.... Here, A, B and C refers to

(A)A − 600 kJ mol; B − 1200 kJ mol; C – calciumCorrect
(B)A − 1200 kJ mol; B − 600 kJ mol; C – strontium
(C)A − 1200 kJ mol; B − 600 kJ mol; C – lanthanum
(D)A − 600 kJ mol; B − 1200 kJ mol; C – lutetium

Answer: (A)

Solution

The first ionisation enthalpies of lanthanoids are about 600 kJ mol and the second about 1200 kJ mol, comparable with

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Question ID VK-074848