Stability of Coordination Compounds
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CHXII09:COORDINATION COMPOUNDS

322116 For the reaction \(\mathrm{Ni}^{2+}+4 \mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\) at equilibrium, if the solution contains \(1.6 \times 10^{-4} \%\) of nickel in the free state and the concentration of \(\mathrm{NH}_{3}\) at equilibrium is 0.5 \(\mathrm{M}\), then the instability constant of the complex will be approximately equal to

1 \(1.0 \times 10^{-5}\)
2 \(1.5 \times 10^{-16}\)
3 \(1.0 \times 10^{-7}\)
4 \(1.5 \times 10^{-17}\)
CHXII09:COORDINATION COMPOUNDS

322117 Assertion :
If \(\beta_{4}\) for \(\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\) is \(2.1 \times 10^{13}\), its instability constant is \(4.76 \times 10^{-14}\).
Reason :
Overall dissociation equilibrium constant varies inversely with formation constant.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and reason is incorrect.
AIIMS - 2009
CHXII09:COORDINATION COMPOUNDS

322118 Assertion :
In a mixture of \(\mathrm{Cd}(\mathrm{II})\) and \(\mathrm{Cu}(\mathrm{II})\), \(\mathrm{Cd}^{2+}\) gets precipitated in presence of \(\mathrm{KCN}\) by \(\mathrm{Cd}^{2+}\).
Reason :
The stability constant of \(\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{3-}\) is greater than \(\left[\mathrm{Cd}(\mathrm{CN})_{4}\right]^{2-}\).

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII09:COORDINATION COMPOUNDS

322119 Which of the following complexes formed by \(\mathrm{Cu}^{2+}\) ions is most stable?

1 \(\mathrm{Cu}^{2+}+4 \mathrm{H}_{2} \mathrm{O} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}, \log \mathrm{K}=8.9\)
2 \(\mathrm{Cu}^{2+}+4 \mathrm{NH}_{3} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}, \log \mathrm{K}=11.6\)
3 \(\mathrm{Cu}^{2+}+4 \mathrm{CN}^{-} \longrightarrow\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{2-}, \log \mathrm{K}=27.3\)
4 \(\mathrm{Cu}^{2+}+2 \mathrm{en}^{-} \longrightarrow\left[\mathrm{Cu}(\text { en })_{2}\right]^{2+}, \log \mathrm{K}=15.4\)
NCERT Exemplar
CHXII09:COORDINATION COMPOUNDS

322120 Assertion :
\(\left[\mathrm{Al}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\) does not exist in aqueous solution.
Reason :
\(\mathrm{NH}_{3}\) is a neutral ligand.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
NEET DIGITAL LIBRARY
CHXII09:COORDINATION COMPOUNDS

322116 For the reaction \(\mathrm{Ni}^{2+}+4 \mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\) at equilibrium, if the solution contains \(1.6 \times 10^{-4} \%\) of nickel in the free state and the concentration of \(\mathrm{NH}_{3}\) at equilibrium is 0.5 \(\mathrm{M}\), then the instability constant of the complex will be approximately equal to

1 \(1.0 \times 10^{-5}\)
2 \(1.5 \times 10^{-16}\)
3 \(1.0 \times 10^{-7}\)
4 \(1.5 \times 10^{-17}\)
CHXII09:COORDINATION COMPOUNDS

322117 Assertion :
If \(\beta_{4}\) for \(\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\) is \(2.1 \times 10^{13}\), its instability constant is \(4.76 \times 10^{-14}\).
Reason :
Overall dissociation equilibrium constant varies inversely with formation constant.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and reason is incorrect.
AIIMS - 2009
CHXII09:COORDINATION COMPOUNDS

322118 Assertion :
In a mixture of \(\mathrm{Cd}(\mathrm{II})\) and \(\mathrm{Cu}(\mathrm{II})\), \(\mathrm{Cd}^{2+}\) gets precipitated in presence of \(\mathrm{KCN}\) by \(\mathrm{Cd}^{2+}\).
Reason :
The stability constant of \(\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{3-}\) is greater than \(\left[\mathrm{Cd}(\mathrm{CN})_{4}\right]^{2-}\).

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII09:COORDINATION COMPOUNDS

322119 Which of the following complexes formed by \(\mathrm{Cu}^{2+}\) ions is most stable?

1 \(\mathrm{Cu}^{2+}+4 \mathrm{H}_{2} \mathrm{O} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}, \log \mathrm{K}=8.9\)
2 \(\mathrm{Cu}^{2+}+4 \mathrm{NH}_{3} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}, \log \mathrm{K}=11.6\)
3 \(\mathrm{Cu}^{2+}+4 \mathrm{CN}^{-} \longrightarrow\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{2-}, \log \mathrm{K}=27.3\)
4 \(\mathrm{Cu}^{2+}+2 \mathrm{en}^{-} \longrightarrow\left[\mathrm{Cu}(\text { en })_{2}\right]^{2+}, \log \mathrm{K}=15.4\)
NCERT Exemplar
CHXII09:COORDINATION COMPOUNDS

322120 Assertion :
\(\left[\mathrm{Al}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\) does not exist in aqueous solution.
Reason :
\(\mathrm{NH}_{3}\) is a neutral ligand.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Join With Us for More Updates
CHXII09:COORDINATION COMPOUNDS

322116 For the reaction \(\mathrm{Ni}^{2+}+4 \mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\) at equilibrium, if the solution contains \(1.6 \times 10^{-4} \%\) of nickel in the free state and the concentration of \(\mathrm{NH}_{3}\) at equilibrium is 0.5 \(\mathrm{M}\), then the instability constant of the complex will be approximately equal to

1 \(1.0 \times 10^{-5}\)
2 \(1.5 \times 10^{-16}\)
3 \(1.0 \times 10^{-7}\)
4 \(1.5 \times 10^{-17}\)
CHXII09:COORDINATION COMPOUNDS

322117 Assertion :
If \(\beta_{4}\) for \(\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\) is \(2.1 \times 10^{13}\), its instability constant is \(4.76 \times 10^{-14}\).
Reason :
Overall dissociation equilibrium constant varies inversely with formation constant.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and reason is incorrect.
AIIMS - 2009
CHXII09:COORDINATION COMPOUNDS

322118 Assertion :
In a mixture of \(\mathrm{Cd}(\mathrm{II})\) and \(\mathrm{Cu}(\mathrm{II})\), \(\mathrm{Cd}^{2+}\) gets precipitated in presence of \(\mathrm{KCN}\) by \(\mathrm{Cd}^{2+}\).
Reason :
The stability constant of \(\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{3-}\) is greater than \(\left[\mathrm{Cd}(\mathrm{CN})_{4}\right]^{2-}\).

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII09:COORDINATION COMPOUNDS

322119 Which of the following complexes formed by \(\mathrm{Cu}^{2+}\) ions is most stable?

1 \(\mathrm{Cu}^{2+}+4 \mathrm{H}_{2} \mathrm{O} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}, \log \mathrm{K}=8.9\)
2 \(\mathrm{Cu}^{2+}+4 \mathrm{NH}_{3} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}, \log \mathrm{K}=11.6\)
3 \(\mathrm{Cu}^{2+}+4 \mathrm{CN}^{-} \longrightarrow\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{2-}, \log \mathrm{K}=27.3\)
4 \(\mathrm{Cu}^{2+}+2 \mathrm{en}^{-} \longrightarrow\left[\mathrm{Cu}(\text { en })_{2}\right]^{2+}, \log \mathrm{K}=15.4\)
NCERT Exemplar
CHXII09:COORDINATION COMPOUNDS

322120 Assertion :
\(\left[\mathrm{Al}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\) does not exist in aqueous solution.
Reason :
\(\mathrm{NH}_{3}\) is a neutral ligand.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXII09:COORDINATION COMPOUNDS

322116 For the reaction \(\mathrm{Ni}^{2+}+4 \mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\) at equilibrium, if the solution contains \(1.6 \times 10^{-4} \%\) of nickel in the free state and the concentration of \(\mathrm{NH}_{3}\) at equilibrium is 0.5 \(\mathrm{M}\), then the instability constant of the complex will be approximately equal to

1 \(1.0 \times 10^{-5}\)
2 \(1.5 \times 10^{-16}\)
3 \(1.0 \times 10^{-7}\)
4 \(1.5 \times 10^{-17}\)
CHXII09:COORDINATION COMPOUNDS

322117 Assertion :
If \(\beta_{4}\) for \(\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\) is \(2.1 \times 10^{13}\), its instability constant is \(4.76 \times 10^{-14}\).
Reason :
Overall dissociation equilibrium constant varies inversely with formation constant.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and reason is incorrect.
AIIMS - 2009
CHXII09:COORDINATION COMPOUNDS

322118 Assertion :
In a mixture of \(\mathrm{Cd}(\mathrm{II})\) and \(\mathrm{Cu}(\mathrm{II})\), \(\mathrm{Cd}^{2+}\) gets precipitated in presence of \(\mathrm{KCN}\) by \(\mathrm{Cd}^{2+}\).
Reason :
The stability constant of \(\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{3-}\) is greater than \(\left[\mathrm{Cd}(\mathrm{CN})_{4}\right]^{2-}\).

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII09:COORDINATION COMPOUNDS

322119 Which of the following complexes formed by \(\mathrm{Cu}^{2+}\) ions is most stable?

1 \(\mathrm{Cu}^{2+}+4 \mathrm{H}_{2} \mathrm{O} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}, \log \mathrm{K}=8.9\)
2 \(\mathrm{Cu}^{2+}+4 \mathrm{NH}_{3} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}, \log \mathrm{K}=11.6\)
3 \(\mathrm{Cu}^{2+}+4 \mathrm{CN}^{-} \longrightarrow\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{2-}, \log \mathrm{K}=27.3\)
4 \(\mathrm{Cu}^{2+}+2 \mathrm{en}^{-} \longrightarrow\left[\mathrm{Cu}(\text { en })_{2}\right]^{2+}, \log \mathrm{K}=15.4\)
NCERT Exemplar
CHXII09:COORDINATION COMPOUNDS

322120 Assertion :
\(\left[\mathrm{Al}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\) does not exist in aqueous solution.
Reason :
\(\mathrm{NH}_{3}\) is a neutral ligand.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
NEET DIGITAL LIBRARY
CHXII09:COORDINATION COMPOUNDS

322116 For the reaction \(\mathrm{Ni}^{2+}+4 \mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\) at equilibrium, if the solution contains \(1.6 \times 10^{-4} \%\) of nickel in the free state and the concentration of \(\mathrm{NH}_{3}\) at equilibrium is 0.5 \(\mathrm{M}\), then the instability constant of the complex will be approximately equal to

1 \(1.0 \times 10^{-5}\)
2 \(1.5 \times 10^{-16}\)
3 \(1.0 \times 10^{-7}\)
4 \(1.5 \times 10^{-17}\)
CHXII09:COORDINATION COMPOUNDS

322117 Assertion :
If \(\beta_{4}\) for \(\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\) is \(2.1 \times 10^{13}\), its instability constant is \(4.76 \times 10^{-14}\).
Reason :
Overall dissociation equilibrium constant varies inversely with formation constant.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and reason is incorrect.
AIIMS - 2009
CHXII09:COORDINATION COMPOUNDS

322118 Assertion :
In a mixture of \(\mathrm{Cd}(\mathrm{II})\) and \(\mathrm{Cu}(\mathrm{II})\), \(\mathrm{Cd}^{2+}\) gets precipitated in presence of \(\mathrm{KCN}\) by \(\mathrm{Cd}^{2+}\).
Reason :
The stability constant of \(\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{3-}\) is greater than \(\left[\mathrm{Cd}(\mathrm{CN})_{4}\right]^{2-}\).

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII09:COORDINATION COMPOUNDS

322119 Which of the following complexes formed by \(\mathrm{Cu}^{2+}\) ions is most stable?

1 \(\mathrm{Cu}^{2+}+4 \mathrm{H}_{2} \mathrm{O} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}, \log \mathrm{K}=8.9\)
2 \(\mathrm{Cu}^{2+}+4 \mathrm{NH}_{3} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}, \log \mathrm{K}=11.6\)
3 \(\mathrm{Cu}^{2+}+4 \mathrm{CN}^{-} \longrightarrow\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{2-}, \log \mathrm{K}=27.3\)
4 \(\mathrm{Cu}^{2+}+2 \mathrm{en}^{-} \longrightarrow\left[\mathrm{Cu}(\text { en })_{2}\right]^{2+}, \log \mathrm{K}=15.4\)
NCERT Exemplar
CHXII09:COORDINATION COMPOUNDS

322120 Assertion :
\(\left[\mathrm{Al}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\) does not exist in aqueous solution.
Reason :
\(\mathrm{NH}_{3}\) is a neutral ligand.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.