CAIE A-Level Chemistry AS 12.1.5 Role of No and No2 in the Formation of Acid Questions

Practise equations for direct nitric-acid formation and the catalytic role of NO and NO2 in oxidising atmospheric SO2.

Exam points

Write or interpret the direct NO₂ + H₂O (and O₂ where required) pathway forming nitric acid, a component of acid rain.
Explain the NO₂-catalysed oxidation of atmospheric SO₂ to SO₃ using NO₂ + SO₂ → NO + SO₃ and NO + ½O₂ → NO₂.
Complete the acid-rain pathway by relating SO₃ reacting with atmospheric water to H₂SO₄ and identifying NO₂ as regenerated catalyst.

[Maximum number: 1]

Nitrogen and phosphorus are elements in Group 15 of the Periodic Table.

Nitrogen is found in inorganic compounds such as nitrogen oxides ( $\mathrm{NO}_{x}$ ), nitrates and nitric acid.

Write an equation to describe the role of $\mathrm{NO}_{2}$ in the direct formation of acid rain.

$2 \mathrm{NO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{HNO}_{2}+\mathrm{HNO}_{3} \mathrm{OR} 4 \mathrm{NO}_{2}+\mathrm{O}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 4 \mathrm{HNO}_{3}$

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CAIE A-Level Chemistry AS 12.1.5 Role of No and No2 in the Formation of Acid Questions question 1