Question:easy
According to Werner’s theory, the primary valencies of the central metal atom :
According to Werner’s theory, the primary valencies of the central metal atom :
Show Hint
Primary valency = Oxidation state = Ionisable. Secondary valency = Coordination number = Non-ionisable.
Updated On: Jun 29, 2026
- are satisfied by neutral molecules or negative ions.
- are equal to its coordination number.
- are satisfied by negative ions.
- are non-ionisable.
Show Solution
The Correct Option is C
Solution and Explanation
Step 1: Werner's two types of valency.
Werner proposed primary valency (= oxidation state, ionizable in solution) and secondary valency (= coordination number, non-ionizable, satisfied by ligands including neutral molecules).
Step 2: Primary valency is satisfied by negative ions only.
Primary valencies correspond to the ionic charge of the metal and are balanced by anions (counter ions outside the coordination sphere). They dissociate and ionize in solution. Neutral molecules satisfy only secondary valency.
Step 3: Evaluate options.
Option (A) describes secondary valency. Option (B) confuses primary with secondary. Option (D) is wrong because primary valencies ARE ionizable. Option (C) is the correct statement.
\[ \boxed{\text{Satisfied by negative ions (Option C)}} \]
Werner proposed primary valency (= oxidation state, ionizable in solution) and secondary valency (= coordination number, non-ionizable, satisfied by ligands including neutral molecules).
Step 2: Primary valency is satisfied by negative ions only.
Primary valencies correspond to the ionic charge of the metal and are balanced by anions (counter ions outside the coordination sphere). They dissociate and ionize in solution. Neutral molecules satisfy only secondary valency.
Step 3: Evaluate options.
Option (A) describes secondary valency. Option (B) confuses primary with secondary. Option (D) is wrong because primary valencies ARE ionizable. Option (C) is the correct statement.
\[ \boxed{\text{Satisfied by negative ions (Option C)}} \]
Was this answer helpful?
0
Top Questions on Werner’s Theory of Coordination Compounds
- Sum of oxidation state (magnitude) and coordination number of cobalt in \(Na[Co(bpy)Cl_4]\) is____ .
(Given : bpy =
)- JEE Main - 2022
- Chemistry
- Werner’s Theory of Coordination Compounds
- The primary and secondary valencies of cobalt respectively in \([ Co(NH_3)_5Cl]Cl_2\) are :
- JEE Main - 2023
- Chemistry
- Werner’s Theory of Coordination Compounds
- The number of bridging $CO$ ligand (s) and $Co - Co$ bond (s) in $ {CO_2(CO)_8}$, respectively are :
- JEE Main - 2019
- Chemistry
- Werner’s Theory of Coordination Compounds
- On treatment of $100\, mL$ of $0.1\, M$ solution of $CoCl _{3} \cdot 6 H _{2} O$ with excess $AgNO _{3} ; 1.2 \times 10^{22}$ ions are precipitated. The complex is
- JEE Main - 2017
- Chemistry
- Werner’s Theory of Coordination Compounds
- Want to practice more? Try solving extra ecology questions todayView All Questions