A) Primary valencies are ionizable
B) Secondary valencies are ionizable
C) Only primary valencies are non-ionizable
D) Primary and secondary valencies are non- ionizable
Correct Answer: A
Solution :
According to postulates of Werners theory for co-ordination compounds, metal atoms exhibit two types of valencies, i.e., primary valency and secondary valency. The primary valency is ionizable whereas the secondary valency is non-ionizable.
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