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Question
Explain why:
Mercury loses its meniscus in contact with ozone.
Explain
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Solution 1
This is due to the formation of mercurous oxide (Hg2O) which dissolves in mercury.
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Solution 2
- Ozone oxidises mercury to form mercurous oxide (Hg2O).
- The formed Hg2O dissolves in mercury metal.
- This causes mercury to lose its meniscus.
- Mercury then sticks to the glass surface.
- This phenomenon is called tailing of mercury.
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Notes
Students can refer to the provided solutions based on their preferred marks.
Ozone Layer Depletion - Reaction with Lead Sulphide, Potassium Iodide and Mercury
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2017-2018 (March) Set 1
