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Werner's Theory MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 25, 2023 25:24 PM | #NEET

Quick Facts

Bonding in Coordination Compounds(Werner's Theory) is considered one of the most asked concept.
19 Questions around this concept.

Solve by difficulty

One mole of the complex compound $Co(NH_{3})_{5}Cl_{3},$ gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of $AgNO_{3}$ solution to yield two moles of $AgCl\, (s).$ The structure of the complex is

$\left [ Co(NH_{3})_{5}Cl \right ]Cl_{2}$

$\left [ Co(NH_{3})_{3}Cl_{2} \right ]\cdot 2NH_{3}$

$\left [ Co(NH_{3})_{4}Cl_{2} \right ]Cl\cdot NH_{3}$

$\left [ Co(NH_{3})_{4}Cl \right ]Cl_{2}\cdot NH_{3}$

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The bond in $K_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$ are:

All ionic

All covalent

Ionic and covalent

Ionic, covalent and co-ordiante covalent

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Concepts Covered - 1

Bonding in Coordination Compounds(Werner's Theory)

The main postulates are:

In coordination compounds metals show two types of linkages (valences)-primary and secondary.
The primary valences are normally ionisable and are satisfied by negative ions.
The secondary valences are non ionisable. These are satisfied by neutral molecules or negative ions. The secondary valence is equal to the coordination number and is fixed for a metal.
The ions/groups bound by the secondary linkages to the metal have characteristic spatial arrangements corresponding to different coordination numbers.

He further postulated that octahedral, tetrahedral and square planar geometrical shapes are more common in coordination compounds of transition metals. Thus, [Co(NH₃)₆]³⁺, [CoCl(NH₃)₅]²⁺ and [CoCl₂(NH₃)₄]⁺ are octahedral entities, while [Ni(CO)₄] and [PtCl₄]^2– are tetrahedral and square planar, respectively.