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Question

Which of the following elements with atomic numbers 25, 30, 48 and 80 has the highest vapour pressure at room temperature?
  1. Z = 30

  2. Z = 48

  3. Z = 80

  4. Z = 25


Solution

The correct option is C

Z = 80


Element with atomic number 80 is Hg, which has weak metallic bonding and exists as a liquid at room temperature, hence has the highest vapour pressure.

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