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

Rajasthan 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. $Cu^+ = 3d^{10}$ witch is very stable configuration due to full$-$filled orbitals.Hense, removal of second electron requires veryhigh energy.
  2. $Zn^{2+} = 3d^{10}$ 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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