Assertion : Europium (II) is more stable than | vedclass

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(C) The electronic configuration of $Eu^{2+}$ is $[Xe] 4f^7$,which is a half-filled $f$-orbital configuration,providing extra stability.The electronic

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(C) The electronic configuration of $Eu^{2+}$ is $[Xe] 4f^7$,which is a half-filled $f$-orbital configuration,providing extra stability.The electronic configuration of $Ce^{2+}$ is $[Xe] 4f^1 5d^1$,which is less stable.Therefore,the Assertion is correct.Cerium salts are generally not used as catalysts in petroleum cracking; rather,zeolites or other specific catalysts are used. Thus,the Reason is incorrect.

Assertion : Europium $(II)$ is more stable than cerium $(II)$.
Reason : Cerium salts are used as catalyst in petroleum cracking.

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Assertion : Europium $(II)$ is more stable than cerium $(II)$.Reason : Cerium salts are used as catalyst in petroleum cracking.