Which statement is correct about this reaction?
[Co(NH₃)₆]²⁺ + 3H₂NCH₂CH₂NH₂ → [Co(HNCH₂CH₂NH₂)₃]²⁺ + 6NH₃
A - AQA - A-Level Chemistry - Question 26 - 2018 - Paper 3
Question 26
Which statement is correct about this reaction?
[Co(NH₃)₆]²⁺ + 3H₂NCH₂CH₂NH₂ → [Co(HNCH₂CH₂NH₂)₃]²⁺ + 6NH₃
A. The co-ordination number of cobalt decreases.
B. The... show full transcript
Worked Solution & Example Answer:Which statement is correct about this reaction?
[Co(NH₃)₆]²⁺ + 3H₂NCH₂CH₂NH₂ → [Co(HNCH₂CH₂NH₂)₃]²⁺ + 6NH₃
A - AQA - A-Level Chemistry - Question 26 - 2018 - Paper 3
Step 1
A. The co-ordination number of cobalt decreases.
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Answer
This statement is incorrect. The coordination number remains the same in this reaction.
Step 2
B. The enthalpy change is large and positive.
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Answer
This statement is not necessarily true. The enthalpy change can vary based on the specific reaction conditions.
Step 3
C. The entropy change is large and positive.
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Answer
This statement is correct. The formation of the product involves an increase in disorder due to the release of NH₃, thus making the entropy change positive.
Step 4
D. The shape of the complex changes from octahedral.
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Answer
This statement is incorrect. The coordination complex retains its octahedral geometry in both the reactants and products.
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