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Secondary valences are I. non-ionisabl...

Secondary valences are
I. non-ionisable
II. Satisfied by neutral molecules or negative ions.
III. Equal to the coordination number and is fixed for a metal.
The correct set of statements is

A

I and II

B

II and III

C

I and III

D

All of these

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the characteristics of secondary valences, we will analyze each statement provided in the question step by step. ### Step 1: Understanding Secondary Valences Secondary valences are part of Werner's theory of coordination compounds. They are distinct from primary valences, which are typically ionizable. **Hint:** Remember that secondary valences relate to how ligands coordinate with a central metal atom. ### Step 2: Evaluating Statement I The first statement claims that secondary valences are non-ionizable. This is true because secondary valences do not dissociate in solution, unlike primary valences. **Hint:** Consider the nature of the bonds formed in coordination compounds to determine if they are ionizable. ### Step 3: Evaluating Statement II The second statement states that secondary valences are satisfied by neutral molecules or negative ions. This is also correct, as secondary valences can be fulfilled by ligands that are either neutral (like water) or negatively charged (like chloride ions). **Hint:** Think about the types of ligands that can coordinate with a metal center. ### Step 4: Evaluating Statement III The third statement asserts that secondary valences are equal to the coordination number and are fixed for a metal. This statement is accurate because the coordination number indicates how many ligands can bond to the central metal atom, which corresponds to the secondary valence. **Hint:** Recall the definition of coordination number in the context of coordination compounds. ### Conclusion All three statements about secondary valences are correct. Therefore, the correct answer to the question is that all of the statements are true. **Final Answer:** The correct set of statements is all of these (Option 4).
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Knowledge Check

  • Which of the following are not postulates of Werner? (P) In co-ordination compounds, metals show two types of linkage (valencies) primary and secondary (Q) The primary valencies are normally ionisable. These are satisfied by netural molecules or negative ions. The secondary valency is equal to the co-ordination number and is fixed for a metal The ions/groups bound by the primary and secondary linkages to the metal have characteristic spatial arrangements corresponding to different coordination numbers (T) Octahedral, Tetrahedral and Square planar geometrical shapes are more common in co-ordination compounds of transition metals

    A
    (P), (Q), (R ) and (S)
    B
    (S) and (T)
    C
    (S)
    D
    (P), (Q), and (R )

  • Which of the following are not postulates of Werner? (P) In co-ordination compounds, metals show two types of linkage (valencies) primary and secondary (Q) The primary valencies are normally ionisable. These are satisfied by negative ions. (R) The secondary valency is equal to the co-ordination number and is fixed for a metal (S) The ions/groups bound by the primary and secondary linkages to the metal have characteristic spatial arrangements corresponding to different coordination numbers (T) Octahedral, Tetrahedral and Square planar geometrical shapes are more common in co-ordination compounds of transition metals

    A
    (P), (Q), (R ) and (S)
    B
    (S) and (T)
    C
    (S)
    D
    (P), (Q), and (R )

  • The number of neutral molecules or negative groups attached to be central metal atom in a complex ion is called

    A
    Atomic number
    B
    Effective atomic number
    C
    Coordination number
    D
    Primary valency

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