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

CBSE BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
Consider the following complex $[Co(NH_3)_5CO_3]ClO_4$. The coordination number, oxidation number, number of $d-$ electrons and number of unpaired $d-$ electrons on the metal are respectively
  • ✓
    $6,\,3,\,6,\,0$
  • B
    $7,\,2,\,7,\,1$
  • C
    $7,\,1,\,6,\,4$
  • D
    $6,\,2,\,7,\,3$
✓

Answer

Correct option: A.
$6,\,3,\,6,\,0$
a
$[Co(NH_3)_5CO_3]ClO_4$. Six monodentate ligands are attached to $Co$ hence $C$. $N$. of

$Co = 6$;

$O. N. = x + 5 \times (0) + 1 \times (-2) + 1\times (-1) = 0$

$\therefore $     $x = + 3$ ; electronic configuration of

$Co^{3+}[Ar]\, 3d^64s^0$ hence number of $d$ electrons is $6$. All $d-$ electrons are paired due to strong ligand hence unpaired electron is zero.

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