Tag: coordination compounds

Questions Related to coordination compounds

The primary velency of the cemtral transition metal ion in comlex compounds $[Cr(NH _3) _4CI _2]CI$

chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

  1. 3

  2. 2

  3. 1

  4. 0

Show answer
Correct Option: A

Select correct statement about "Ziese's salt' $K[PtCI _{3}(n^ {2}-C _{2}H _{4})]$

chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

  1. It has only two types of $M-CI$ bond length

  2. $E.A.N=84$

  3. It's $\pi$ Bonded $O.M.C$

  4. $All\ of\ these$

Show answer
Correct Option: D

The primary valency of iron in ${{\text{K}} _{\text{4}}}\left[ {{\text{Fe}}{{\left( {{\text{CN}}} \right)} _{\text{6}}}} \right]$ is 

chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

  1. 1

  2. 2

  3. 3

  4. 4

Show answer
Correct Option: B

The units of solubility product of silver chromate $(Ag 2CrO _4)$ will be _________.

chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

  1. $mol^2L^{-2}$

  2. $mol^3L^{-3}$

  3. $mol L^{-1}$

  4. $mol L^{-2}$

Show answer
Correct Option: C
Explanation:
 Molar solubility is the number of moles of a substance (the solute) that can be dissolved per liter of solution before the solution becomes saturated. It can be calculated from a substance's solubility product constant (Ksp) and stoichiometry. The units are mol/L, sometimes written as M.

In $CuSO _4.5H _2O$ how many molecules of water are indirectly connected to Cu? 

chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

  1. $5$

  2. $4$

  3. $2$

  4. $1$

Show answer
Correct Option: D
Explanation:

Solution:- (D) $1$

In $CuSO _4.5H _2O$, Four water molecules form coordinate bond with $Cu _{2+}$ ion while one water molecule is associated with $H$- bond

The primary valence of the metal ion is satisfied by :

chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

  1. neutral molecules

  2. positive ions

  3. negative ions

  4. all

Show answer
Correct Option: C
Explanation:

The primary or principal valency; this is the ionisable valency. 


A metal always gives electron and becomes positively charged that can be neutralized by bonding with negative ion only. In a coordination compound, the number of negative ions needed to satisfy the charge on the central metal ion is it's  primary valency.

Secondary valencies correspond to ____________ of the metal atom and are satisfied by ligands.

chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

  1. coordination number

  2. valency

  3. element

  4. molecules

Show answer
Correct Option: A
Explanation:

 Secondary valency corresponds to the coordination number of central metal atom or ion. This may be satisfied by either negative ions or neutral molecules called ligands.

 Ligands satisfying the secondary valencies are always shown in square brackets, i.e. they form the coordination sphere of the metal atom.


Hence,option A is correct.

$2.33$g of compound X(empirical formula $CoH _{12}N _4Cl _3)$ upon treatment with excess $AgNO _3$ solution produces $1.435$g of a white precipitate. The primary and secondary valences of cobalt in compound X, respectively, are.
[Given : Atomic mass: $Co=59, Cl=35.5, Ag=108$].

chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

  1. $3, 6$

  2. $3, 4$

  3. $2, 4$

  4. $4, 3$

Show answer
Correct Option: A
Explanation:

Since $0.01$ mole of $X$ produces $0.01$ mole of $AgCl$,hence one $Cl^-$ is out of coordination sphere or complex is $[CO(NH _3) _4Cl _2]Cl$ AND HENCE $CO(3+)$,has $6$ coordination number

Several octahedral complexes are possible from combinations of $Co^{3+}, Cl^{-}$ and $NH {3}$. The correct statement(s) regarding the octahedral coordination entities having the formula .$[Co(NH _{3}) _{n}Cl _{6 - n}]^{(n - 3)+}$ with $n\geq 3$, is/ are____________.

chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

  1. At most six octahedral complexes are possible

  2. One of the complexes is homoleptic

  3. All the complexes are paramagnetic

  4. Some of the complexes dissociate in water to give $Co^{3+}$ and $Cl^{-}$ ions

Show answer
Correct Option: A,B
Explanation:

$[Co(NH _3) _nCl _{6-n}]^{(n-3)^+}$  $n\ge 3$

For $n=3,n=4,n=5,n=6$
For $n=6\Rightarrow [Co(NH _3) _6]^{3+}=$ is  homopletic due to all 6 same ligands.
For $n=5\Rightarrow [Co(NH _3) _6]^{2+}$
For $n=4\Rightarrow [Co(NH _3) _6]^+=$
For $n=3\Rightarrow [Co(NH _3) _6]$
Only $4$ octahedral complex are possible.
One of them is homoleptic.

In the separation of $Cu^{2+}$ and $Cd^{2+}$ in the second group of qualitative analysis of cations, tetraamine copper (ll) sulphate and tetraamine cadmium (ll) sulphate react with KCN to form corresponding cyano complexes. Which of the following pairs of complexes and their relative stability enables the separation of $Cu^{2+}$ and $Cd^{2+}$?

chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

  1. $K _2[Cu(CN) _4]$ is less stable and $K _2[Cd(CN) _4]$ is more stable

  2. $K _3[Cu(CN) _4]$ is more stable and $K _2[Cd(CN) _4]$ is less stable
  3. $K _3[Cu(CN) _4]$ is less stable and $K _2[Cd(CN) _4]$ is more stable

  4. $K _2[Cu(CN) _4]$ is more stable and $K _2[Cd(CN) _4]$ is less stable

Show answer
Correct Option: B