Dot-and-cross diagrams: past paper questions

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• Question 24May/June 2026, paper 11Multiple choice1 markHas a diagram

  The table gives information about the bonding in different species. Which row is correct?

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• Question 21May/June 2025, paper 13Multiple choice1 markHas a diagram

  Which dot-and-cross diagrams represent molecules that can react with unburned hydrocarbons to form peroxyacetyl nitrate, PAN, a component of photochemical smog?

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• Question 5Oct/Nov 2024, paper 12Multiple choice1 markHas a diagram

  An ion contains 1 nitrogen atom and 2 hydrogen atoms. It has an $\mathrm{H}-\mathrm{N}-\mathrm{H}$ bond angle of approximately ${105}^{\circ }$. Which row is correct?

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• Question 20May/June 2023, paper 13Multiple choice1 mark

  $\mathrm{H}\mathrm{C}\mathrm{N}$ has been detected in interstellar gas. The molecules below have also been detected in interstellar gas. Which molecule contains the same total number of valence shell (outer shell) electrons as $\mathrm{H}\mathrm{C}\mathrm{N}$?

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• Question 6May/June 2024, paper 12Multiple choice1 mark

  In which species does the underlined atom have an incomplete outer shell?

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• Question 2May/June 2024, paper 21Structured12 marksHas a diagram

  Sulfur chloride, ${\mathrm{S}\mathrm{C}\mathrm{l}}_2$, is a liquid at room temperature. When ${\mathrm{S}\mathrm{C}\mathrm{l}}_2$ is added to water, misty fumes are seen and a solution is made that turns universal indicator red. Identify the type of reaction that occurs when ${\mathrm{S}\mathrm{C}\mathrm{l}}_2$ is added to water.

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• Question 3May/June 2024, paper 22Structured12 marksHas a diagram

  Describe what is meant by dynamic equilibrium.

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