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Transition metals (A-level only)

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Question 7

Which statement is correct about this reaction?

[Ni(H2O)6]2++3H2NCH2CH2NH2→[Ni(H2NCH2CH2NH2)3]2++6H2O \text{[Ni(H}_2\text{O)}_6]^{2+} + 3\text{H}_2\text{NCH}_2\text{CH}_2\text{NH}_2 \rightarrow \text{[Ni(H}_2\text{NCH}_2\text{CH}_2\text{NH}_2)_3]^{2+} + 6\text{H}_2\text{O} [Ni(H2​O)6​]2++3H2​NCH2​CH2​NH2​→[Ni(H2​NCH2​CH2​NH2​)3​]2++6H2​O
A

The coordination number of nickel decreases.

B

The enthalpy change of the reaction is large and positive.

C

The entropy change of the reaction is large and positive.

D

The shape of the complex changes from octahedral.

Markscheme

Transition metals (A-level only) Questions

  1. A Level
  2. /Chemistry
  3. /Transition metals (A-level only)

63 exam-style questions on AQA A Level Chemistry Transition metals (A-level only), covering General properties of transition metals (A-level only), Substitution reactions (A-level only), Shapes of complex ions (A-level only), Formation of coloured ions (A-level only), Variable oxidation states (A-level only), and Catalysts (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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