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.
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.
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 shows two kinds of valence. The primary valence is the oxidation state, and it is ionisable.
The secondary valence is the coordination number. It is non-ionisable and is satisfied by ligands.
Step 2: Check statement (A).
Ligands are bonded to the metal inside the coordination sphere. They do not separate as ions in solution. So secondary valences are non-ionisable, and (A) is TRUE.
Step 3: Check statement (B).
This describes the primary valence, not the secondary one. In \( \mathrm{[Co(NH_3)_6]Cl_3} \) the three chloride ions are ionisable (primary), but the six \( \mathrm{NH_3} \) are not. So (B) is FALSE.
Step 4: Check statement (C).
Secondary valences are satisfied by neutral molecules such as \( \mathrm{NH_3} \) and \( \mathrm{H_2O} \), or by negative ions such as \( \mathrm{Cl^-} \) and \( \mathrm{CN^-} \). So (C) is TRUE.
Step 5: Check statement (D).
The secondary valence equals the coordination number. It is fixed for a given metal in a given oxidation state, for example 6 for Co(III). So (D) is TRUE.
Final Answer:
The incorrect statement is (B), since ionisable valences are the primary ones. \[ \boxed{\text{(B)}} \]
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Identify the incorrect statement from the given statements.
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