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Transition metals (A-level only)

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Question 4
1.

Explain how nitrogen monoxide (NO\text{NO}NO) is formed in industrial gas turbine combustors.

[2]
2.

State one environmental or health hazard associated with the emission of oxides of nitrogen.

[1]
3.

To mitigate emissions, industrial power plants utilize selective catalytic reduction (SCR) systems where ammonia, NH3\text{NH}_3NH3​, reacts with nitrogen dioxide, NO2\text{NO}_2NO2​, in the presence of a catalyst to form nitrogen and water.

  • Give the oxidation state of nitrogen in each of NO2\text{NO}_2NO2​, NH3\text{NH}_3NH3​, and N2\text{N}_2N2​.
  • Complete and balance the equation for this reaction:
‾ NO2+‾ NH3→‾ N2+‾ H2O \underline{\quad}\ \text{NO}_2 + \underline{\quad}\ \text{NH}_3 \rightarrow \underline{\quad}\ \text{N}_2 + \underline{\quad}\ \text{H}_2\text{O} ​ NO2​+​ NH3​→​ N2​+​ H2​O
[2]
4.

The SCR system uses a solid metal oxide catalyst, such as vanadium(V) oxide, to facilitate this process. State the meaning of the term heterogeneous catalyst.

[2]
5.

Carbon monoxide (CO\text{CO}CO) is another pollutant that can be released from gas turbines if the fuel-to-air ratio is incorrect. Explain why carbon monoxide is formed instead of carbon dioxide.

[1]
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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