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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 properties given in Column I with the metals given in Column II.
 
Column I (Property)
 
Column II (Metal)
(i)
Element with highest second ionisation enthalpy
(a)
Co
(ii)
Element with highest third ionisation enthalpy
(b)
Cr
(iii)
M in M (CO)6 is
(c)
Cu
(iv)
Element with highest heat of atomisation
(d)
Zn
   
(e)
 Ni
✓

Answer

 
Column I (Property)
 
Column II (Metal)
(i)
Element with highest second ionisation enthalpy
(c)
Cu
(ii)
Element with highest third ionisation enthalpy
(d)
Zn
(iii)
M in M (CO)6 is
(b)
Cr
(iv)
Element with highest heat of atomisation
(e)
Ni

 

Explanation:

  1. Cu+ = 3d10 witch is very stable configuration due to full-filled orbitals.Hense, removal of second electron requires veryhigh energy.
  2. Zn2+ = 3d10 witch is very stable configuration.Hense, removal of thirdelectron requires veryhigh energy.
  3. Metal carbonyl with farmula M(CO)6 is Cr(CO)6.
  4. Nickel is the elementswith highest heat of atomization

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