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STD 12 - 5. Co-ordination chemistry — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 5. Co-ordination chemistry4 Marks
MCQ
The correct option(s) regarding the complex $\left[ Co ( en )\left( NH _3\right)_3\left( H _2 O \right)\right]^{3+}$ (en $= H _2 NCH _2 CH _2 NH _2$ ) is (are)

$(A)$ It has two geometrical isomers

$(B)$ It will have three geometrical isomers if bidentate 'en' is replaced by two cyanide ligands

$(C)$ It is paramagnetic

$(D)$ It absorbs light at longer wavelength as compared to $\left[ Co ( en )\left( NH _3\right)_4\right]^{3+}$

  • ✓
    $A,B,D$
  • B
    $A,B,C$
  • C
    $A,B$
  • D
    $B,D$
✓

Answer

Correct option: A.
$A,B,D$
a
Complex $\left[ Co ( en )\left( NH _3\right)_3\left( H _2 O \right)\right]^{+3}$ has two geometrical isomers.

(image)

$\left[ Co \left( NH _3\right)_3\left( H _2 O \right)( CN )_2\right]^{+}$has three geometrical isomers.

(image)

${\left[ Co ( en )\left( NH _3\right)_3\left( H _2 O \right)\right]^{+3} \text { is diamagnetic }}$

Co $=[ Ar ]_{18} 4 s ^2 3 d ^7$

Co $^{+3}=[ Ar ]_{18} 3 d ^6$

en is strong field ligand.

(image)

${\left[ Co ( en )\left( NH _3\right)_3\left( H _2 O \right)\right]^{+3}} -\quad-\Delta_0$

${\left[ Co \text { (en) }\left( NH _3\right)_4\right]^{+4}}$

$\Delta_0=\frac{ hc }{\lambda}$

$\therefore \Delta_0 \propto \frac{1}{\lambda}$

$[Co (en)$ $\left.\left( NH _3\right)_3\left( H _2 O \right)\right]^{+3}$ absorbs light at longer wavelength as compared to $[ Co ( en )$ $\left.\left( NH _3\right)_4\right]^{+3}$

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