According to Alfred Werner, the secondary valence(s) of the central metal atom/ion in a complex :
Identify the incorrect statement from the given statements.
According to Alfred Werner, the secondary valence(s) of the central metal atom/ion in a complex :
Identify the incorrect statement from the given statements.
Show Hint
- are non-ionisable
- are ionisable
- are satisfied by neutral molecules or negative ions
- is equal to the coordination number and is normally fixed for a metal
The Correct Option is B
Solution and Explanation
Werner said a metal in a complex shows two kinds of valence.
Primary valence is the oxidation state of the metal. It is ionisable and is satisfied by negative ions only.
Secondary valence is the coordination number of the metal.
The question asks for the statement that is not true about the secondary valence.
Step 2: Key Formula or Approach:
Recall the four properties of secondary valence:
1. It is non-ionisable.
2. It is satisfied by neutral molecules or negative ions.
3. It equals the coordination number of the metal.
4. It is fixed for a given metal and has a definite direction in space.
Step 3: Check statement (A).
In \( \mathrm{[Co(NH_3)_6]Cl_3} \), the six \( \mathrm{NH_3} \) groups are bonded through secondary valence. They do not leave the complex in water. So (A) is TRUE.
Step 4: Check statement (B).
Ionisable valence belongs to the primary valence, for example the three \( \mathrm{Cl^-} \) ions outside the bracket. Secondary valence is never ionisable. So (B) is FALSE, and it is the incorrect statement.
Step 5: Check statements (C) and (D).
Ligands such as \( \mathrm{NH_3} \), \( \mathrm{H_2O} \), \( \mathrm{Cl^-} \) and \( \mathrm{CN^-} \) all satisfy secondary valence. So (C) is TRUE.
Secondary valence is the coordination number, which is normally fixed for a metal, such as 6 for \( \mathrm{Co^{3+}} \). So (D) is TRUE.
Final Answer:
The incorrect statement is (B), because secondary valences are non-ionisable. \[ \boxed{\text{(B) are ionisable}} \]
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According to Alfred Werner, the secondary valence(s) of the central metal atom/ion in a complex :
Identify the incorrect statement from the statements given in the options.
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