Chemistry Questions and Answers – Stability of Coordination Compounds

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This set of Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Stability of Coordination Compounds”.

1. The degree of ________ between the metal ion and the ligand directly influences the stability of the complex in solution.
a) association
b) dissociation
c) ionisation
d) freedom
View Answer

Answer: a
Explanation: The magnitude of the equilibrium constant for the association quantitatively expresses the stability of the complex in solution.
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2. How are the stepwise stability constants (K) related to the overall stability constant (β)?
a) βn = K1 + K2 + …. + Kn
b) βn = K1 x K2 x … x Kn
c) βn = logK1 + logK2 + …. + logKn
d) βn = 1/(K1 + K2 + …. + Kn)
View Answer

Answer: b
Explanation: The overall stability constant is the product of all the stepwise stability constants of each individual reaction.

3. If the values of stepwise stability constants for a series of successive reactions are logK1 = 4, logK2 = 3.2, logK3 = 2.7 and logK4 = 2, what is the value of β4?
a) 11.9
b) 7.94 x 1011
c) 1.47 x 105
d) 27.4
View Answer

Answer: b
Explanation: logβ4 = logK1 + logK2 + logK3 + logK4
\(\Rightarrow\)log10β4 = 4 + 3.2 + 2.7 + 2 = 11.9
\(\Rightarrow\)β4 = antilog(11.9)
\(\Rightarrow\)β4 = 7.94 x 1011
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4. If β is the formation constant, then the instability constant = ________
a) 1 – β
b) β – 1
c) (1/β)
d) log(β)
View Answer

Answer: c
Explanation: The instability constant is also known as the dissociation constant. It is defined as the reciprocal of the formation or stability constant.

5. For a particular complex, the dissociation equilibrium constant is given as 2.3 x 10-9. What will be the overall stability constant for this complex?
a) 4.35 x 10-10
b) 4.35 x 1010
c) 4.35 x 10-8
d) 4.35 x 108
View Answer

Answer: d
Explanation: Formation constant = 1/(dissociation constant)
\(\Rightarrow\)β = 1/(2.3 x 10-9)
\(\Rightarrow\)β = 4.35 x 108
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6. Two complexes A and B have dissociation constants 1.0 x 10-12 and 4.7 x 10-14 respectively. Which complex will be more stable?
a) A
b) B
c) Both are equally stable
d) Cannot be determined
View Answer

Answer: b
Explanation: The smaller the value of dissociation constant, more stable the complex will be in solution. Since 4.7 x 10-14 < 1.0 x 10-12, complex B is more stable.

Sanfoundry Global Education & Learning Series – Chemistry – Class 12.

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To practice all areas of Chemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.

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