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Question

Why mercury do not evaporate at room temperature?

A
Because melting point of mercury is higher
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B
Because boiling point of mercury is higher
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C
Because boiling point of mercury is lower
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D
Because boiling point of mercury is equal to room temperature
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Solution

The correct option is B Because boiling point of mercury is higher
Evaporation is a process in which some molecules of a liquid, which have greater kinetic energy, escape from the liquid and enter the atmosphere.
When the temperature of the liquid is closer to its boiling point, greater is the evaporation.
Besides the boiling point being higher, the cohesive force of attraction among the molecules of mercury is greater than other liquids like water. This further reduces the evaporation rate.

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