What happens to mercury when it is exposed to cold temperatures?

• A. It expands
• B. It contracts
• C. It freezes
• D. It evaporates

Answer: (B)

The behavior of mercury when exposed to cold temperatures is that it contracts. This contraction occurs because, like many metals, mercury's volume decreases as it cools. As the temperature drops, the kinetic energy of the mercury atoms diminishes, leading them to move closer together, which results in a decrease in volume.

The other choices consider different states or behaviors of mercury, but they do not accurately describe its reaction to cold temperatures. For instance, mercury does not expand under cold conditions, nor does it freeze at typical cold temperatures, because its freezing point is significantly lower than those of most common environments. While mercury can evaporate at room temperature, this process is not directly related to exposure to cold temperatures. Thus, the most accurate description of mercury's response to cold is that it contracts.