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The d & f Block Elements — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements5 Marks
Question
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)
Pm
(ii)
Lanthanoid which can show +2 oxidation state
(b)
Ce
(iii)
Radioactive lanthanoid
(c)
Lu
(iv)
Lanthanoid which has 4f7 electronic configuration in +3 oxidation state
(d)
Eu
(v)
 Lanthanoid which has 4f14 electronic configuration in +3 oxidation state
(e)
Gd
 
 
(f)
Dy
✓

Answer

 
Column I (Property)
 
Column II (Element)
(i)
Lanthanoid which shows +4 oxidation state
(b)
Ce
(ii)
Lanthanoid which can show +2 oxidation state
(d)
Eu
(iii)
Radioactive lanthanoid
(a)
Pm
(iv)
Lanthanoid which has 4f7 electronic configuration in +3 oxidation state
(e)
Gd
(v)
 Lanthanoid which has 4f14 electronic configuration in +3 oxidation state
(c)
Lu

Explanation:

  1. Lanthanoid shows +4 oxidation state- Cerium (Ce)
  2. Lanthanoid shows +2 oxidation state- Europium (Eu)
  3. Radioactive lanthanoid – Promethium (Pm)
  4. Lanthanoid having 4f7 configuration in +3 states – Gadolinium (Gd)
  5. Lanthanoid having 4f14 configuration in +3 states – Lutetium (Lu)

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