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

CBSE BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
A complex whose $IUPAC$ name is not correctly written is

Complex       $-$          Name

  • A
    $Fe(\sigma - C_5H_5)_2$            $Bis ( \eta^5$ -cyclopentadienyl ) iron $(O)$
  • B
    $Cr(C_6H_6)_2$            $Bis(\eta^6$ - benzene) chromium $(O)$
  • ✓
    $[CoCl_2 (H_2O)_4 ]Cl.2H_2O$         Tetraaquadichlorocobalt $(III)$ chloride $-2-  $ water
  • D
    $[Zn(NCS)_4]^{2-}$           Tetrathiocyanato $-N-$ zincate $(II)$ ion
✓

Answer

Correct option: C.
$[CoCl_2 (H_2O)_4 ]Cl.2H_2O$         Tetraaquadichlorocobalt $(III)$ chloride $-2-  $ water
c
$\left[\mathrm{Ni}(\mathrm{CN})_{6}\right]^{2-}$

$\mathrm{Ni}^{+4} \rightarrow \mathrm{d}^{6}$ strong field ligand

$[image(1)]$

Pairing will be there zero unpaired electron

$\mathrm{NiCl}_{2} \rightarrow \mathrm{Ni}^{2+} \rightarrow \mathrm{d}^{8}$

$[image(2)]$

Change $=2$

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