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  • Match the property given in Column I with the element given in Column II. Column I : Lanthanoid which shows + 4 oxidation state, Column II: Pm.

Match the property given in Column I with the element given in Column II.

Column I (Property) Column II (Element)
(i) Lanthanoid which shows +4 oxidation state (a) \text {Pm}
(ii) Lanthanoid which can show +2 oxidation state (b) \text {Ce}
(iii) Radioactive lanthanoid (c) \text {Lu}
(iv) Lanthanoid which has 4f^{7} electronic configuration in +3 oxidation state (d) \text {Eu}
(v) Lanthanoid which has 4f^{14}electronic configuration in +3 oxidation state (e) \text {Gd}
  (f) \text {Dy}

 

Answers (1)

(i) → (b) (ii) → (d) (iii) → (a) (iv) → (e) (v) → (c)

(i) Cerium has oxidation state +4

\text {Ce}=\text {[Xe]}\text {4F}^{2}\text {5d}^{0}\text {6s}^{2};\text {oxidation state}=+3,+4

(ii) Europium has oxidation state of +2

\text {Eu}=\text {[Xe]}\text {4F}^{7}\text {5d}^{0}\text {6s}^{2};\text {oxidation state}=+2,+3

(iii) Promethium is a man-made radioactive lanthanoid.

(iv) Gadolinium has electronic configuration \text {4F}^{7} in +3 oxidation state is.

_{64}\text {Gd}=\text {[Xe]}\text {4F}^{7}\text {5d}^{1}\text {6s}^{2};\text {oxidation state}=+3

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