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5. Co-ordination chemistry — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
Which of the following complexes exhibit the highest paramagnetic behaviour ? Where gly $=$ glycine, en $=$ ethylenediamine and bpy $=$ bipyridyl moities) (At. nos. $Ti =22,\, V = 23,\, Fe = 26, \,Co= 27$)
  • A
    $[Co(OX)_2(OH)_2]^{-3}$
  • ✓
    $[Ti(NH_3)_6]^{3+}$
  • C
    $[V (gly)_2(OH)_2(NH_3)_2]^+$
  • D
    $[Fe(en) (bpy) (NH_3)_2]^{2+}$
✓

Answer

Correct option: B.
$[Ti(NH_3)_6]^{3+}$
b
$(1)$  $[Co{(OX)_2}{(OH)_2}]$        $ \Rightarrow \,C{o^{ + 5}}$    $t_{2g}^4\,e_g^0$     $UPE\, = \,2$

$(2)$  ${[Ti{(N{H_3})_6}]^{ + 3}}$        $ \Rightarrow \,T{i^{ + 3}}$    $t_{2g}^1\,e_g^0$     $UPE\, = \,1$

$(3)$  ${[V{(gly)_2}{(OH)_2}{(N{H_3})_2}]^ + }$        $ \Rightarrow \,{V^{ + 5}}$    $t_{2g}^2\,e_g^0$     $UPE\, = \,0$

$(4)$  ${[Fe(en)(bpy){(N{H_3})_2}]^{ + 2}}$        $ \Rightarrow \,F{e^{ + 2}}$    $t_{2g}^6\,e_g^0$     $UPE\, = \,0$

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