CBSE Class 12 · 2004 · Delhi Compartment · Coordination CompoundsShort Answer

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a) Write the formulae of the following complexes:
i) Hexaammineplatinum(IV) chloride
ii) Dichloridotetraamminecobalt(III) ion
b) The dissociation constants of [Cu(NH

_{3}

)

_{4}

]

^{2 +}

and [Co(NH

_{3}

)

_{6}

]

^{3 +}

are 1.0 × 10⁻¹² and 6.2 × 10⁻³⁶ respectively. Which complex is more stable and why?

Solution

(a)(i)

[Pt (N H_{3})_{6}] C l_{4}

(ii)

[Co (N H_{3})_{4} C l_{2}]^{+}

(b) The dissociation constant measures the tendency of the complex to break into its components.
K

_{d}

([Co(NH

_{3}

)

_{6}

]

^{3 +}

) = 6.2 × 10

^{- 36}

≪ K

_{d}

([Cu(NH

_{3}

)

_{4}

]

^{2 +}

) = 1.0 × 10

^{- 12}

.
Hence \textbf{[Co(NH

_{3}

)

_{6}

]

^{3 +}

is far more stable} — it dissociates to a much smaller extent (its stability constant, 1/K

_{d}

, is larger).

CBSE Class 12 Board · 2004 · Delhi Compartment · Subjective

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