Question:

The valency of Cr in the complex $[Cr(H_2O)_4Cl_2)^+$ is

Updated On: Jul 7, 2022
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The Correct Option is B

Solution and Explanation

Let O.S. of Cr in $[Cr(H_2O)_4Cl_2)^+$ is $x$ O S. of $H_2O$ = 0, O.S. of Cl = -1 $\therefore \, x$ + 4 $\times$ 0 +2(- 1) = + 1 $x$ = +3
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Top Questions on Werner’s Theory of Coordination Compounds

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Concepts Used:

Werner’s Theory of Coordination Compounds

In 1893 Werner produced a theory to explain the structures, formation and nature of bonding in the coordination compounds. This theory is known as Werner’s theory of coordination compounds.

Postulates of Werner's Theory:

The important postulates as observed by Alfred Werner throughout his experiments are as follows:

  • The complex/ coordination compounds contain a central metal atom.
  • The metal atoms in a coordination compound generally show two types of valency: primary valency and secondary valency.
  • The primary valencies denote the oxidation state. They are ionizable and are satisfied by the negative ions.
  • Secondary valencies denote the coordination number. They are non-ionizable and are fixed for every metal atom. The secondary valency is generally satisfied by the neutral molecules or negative ions.
  • The metal atoms should satisfy both primary and secondary valencies.
  • The secondary valency of the atom basically shows the geometry/ polyhedra of the particular coordination compound.

Limitations of Werner’s Theory:

  • Though Werner explained some properties of the coordination compound,  he failed to explain the colour of the coordinate compound.
  • He could not explain the magnetic and optical properties of coordination compounds.
  • He could not answer the question, why does the coordination sphere have a definite geometry.