An aqueous solution of CoCl 3 -6 NH 3 on mixing with excess AgNO 3 produces 3 moles of a white precipitate- Then which of the following statements is-are true-A- The primary valency of the complex is 3B- The secondary valency of the complex is 6C- The complex is - Co NH 36- Cl 3D- The complex is - Co N H 33 Cl 3- N H 33

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An aqueous so...

Question

An aqueous solution of $C o C l_{3} .6 N H_{3}$ on mixing with excess $A g N O_{3}$ produces 3 moles of a white precipitate. Then which of the following statement(s) is/are true:

The primary valency of the complex is 3

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The secondary valency of the complex is 6

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The complex is

[C o (N H_{3})_{6}] C l_{3}

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The complex is

[C o (N H_{3})_{3} C l_{3}] (N H_{3})_{3}

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Solution

The correct options are
A The primary valency of the complex is 3
B The secondary valency of the complex is 6
C The complex is $[C o (N H_{3})_{6}] C l_{3}$
On adding excess $A g N O_{3}$ , the complex produces 3 moles of white precipitate and thus, 3 $C l^{-}$ ions has to be outside the co-ordination sphere. So, the formula of the complex should be $[C o (N H_{3})_{6}] C l_{3}$ .
The primary valency is the oxidation number of the central metal atom which here is +3.
The secondary valency is the coordination number, since 6 ammonia ligands are co-ordinated with Co, the secondary valency of the complex should be 6.

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An aqueous solution of CoCl3.6NH3 on mixing with excess AgNO3 produces 3 moles of a white precipitate. Then which of the following statement(s) is/are true:

An aqueous solution of $C o C l_{3} .6 N H_{3}$ on mixing with excess $A g N O_{3}$ produces 3 moles of a white precipitate. Then which of the following statement(s) is/are true: