The Reaction Below Virtually Goes to Completion Because Cyanide Ion

question 84

Multiple Choice

The reaction below virtually goes to completion because cyanide ion forms very stable complexes with Ni²⁺ ion: [Ni(H₂O) ₆]²⁺(aq) + 4 CN^-(aq) → [Ni(CN) ₄]^2-(aq) + 6 H₂O(l)
At the same time,incorporation of ¹⁴C labelled cyanide ion (¹⁴CN^-) is very rapid:
[Ni(CN) ₄]^2-(aq) + 4 ¹⁴CN^-(aq) = [Ni(¹⁴CN) ₄]^2-(aq) + 4 CN^-(aq)
Which statement below is correct with regard to stability and rate of reaction?

• A)Equilibrium is static.
• B)Stable species can react rapidly.
• C)Stable species do not react rapidly.
• D)Unstable species react rapidly.

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