Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at $25^{o} C$ ?

C o C l_{3} \cdot 5 N H_{3}

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C o C l_{3} \cdot 6 N H_{3}

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C o C l_{3} \cdot 3 N H_{3}

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C o C l_{3} \cdot 4 N H_{3}

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Solution

The correct option is D $C o C l_{3} \cdot 3 N H_{3}$
$C o C l_{3} \cdot 3 N H_{3}$ will not give test for chloride ions with silver nitrate at $25^{o} C$ .
The coordination number of Co is six. 3 ammonia ligands are present in the coordination sphere. Hence, 3 chloride ligands must be present in the coordination sphere.
$C o C l_{3} \cdot 3 N H_{3}$ can also be written as $[C o C l_{3} (N H_{3})_{3}]$ .
Since, all the chloride ions are present in the coordination sphere, they are firmly attached to metal and do not ionize in solution.
Hence, they cannot form precipitate of AgCl with $A g N O_{3}$ solution.

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Similar questions

Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at $25^{\circ} C$ ?

Q. Assertion :

C o C l_{3} \cdot 4 N H_{3}

gives two ions when ionised. Reason: Complex is

[C o (N H_{3})_{4}] C l_{3}

Q. Write the IUPAC name of the following
(i)

P t {C l}_{4} \cdot 5 {N H}_{3}

(gives

4

ions in solution)
(ii)

P t {C l}_{4} \cdot 2 K C l

(gives

3

ions in solution)
(ii)

I r {C l}_{3} \cdot 3 {N H}_{3}

(no

{C l}^{-}

ion is precipitated)
(iv)

C o {C l}_{3} \cdot 4 {N H}_{3}

m(one

C l

is precipitated by

A g {N O}_{3}

Q. The number of ions per mole in the complex

C o C l_{3} ∙ 4 N H_{3}

in aqueous solution will be

In the complex

C o C l_{3} \cdot 5 N H_{3}

, one

C l^{-}

ion satisfies primary and secondary valencies of cobalt(III).

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Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25oC?

Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at $25^{o} C$ ?