A well packed premeasured capsule without any leak releases mercury during
**Core Concept**
The question is testing the understanding of the physical and chemical properties of mercury and its behavior in different environments. Mercury is a volatile, heavy metal that can vaporize at room temperature, posing a risk to human health and the environment.
**Why the Correct Answer is Right**
When a premeasured capsule containing mercury is packed tightly, the pressure inside the capsule increases. This increase in pressure causes the mercury to vaporize more rapidly, releasing it into the air. This phenomenon is known as "pressure-induced vaporization." As a result, the mercury is released from the capsule, posing a risk to those in the surrounding area.
**Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because the question specifically states that the capsule is well-packed and without any leak, which rules out the possibility of mercury leaking out through a defect in the packaging.
- **Option B:** This option is incorrect because it does not provide a plausible explanation for the release of mercury from the capsule.
- **Option C:** This option is incorrect because it implies that the mercury is released due to a defect in the packaging, which is not the case according to the question.
**Clinical Pearl / High-Yield Fact**
When handling mercury-containing substances, it's essential to follow proper protocols to prevent exposure and minimize the risk of mercury poisoning. This includes wearing protective gear, working in a well-ventilated area, and disposing of waste properly.
**Correct Answer:** A.