Most common poisonous salt of mercury is –
**Core Concept**
Mercury poisoning can occur through various routes, including ingestion of mercury-containing substances. The most common poisonous salt of mercury is a compound that is highly toxic and has been used in the past for various industrial and medical purposes.
**Why the Correct Answer is Right**
The correct answer is a mercurial compound that is highly soluble in water, which makes it easily absorbed by the body. This compound is metabolized in the body by the enzyme glutathione, which reduces its toxicity. However, the reduced form of this compound is still highly toxic and can cause damage to the kidneys, nervous system, and other organs. The high toxicity of this compound is due to its ability to bind to sulfhydryl groups in proteins, leading to the formation of mercuric sulfide, which is responsible for its toxicity.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is a less toxic form of mercury that is used in some medical applications. While it is still a mercury compound, it is not as toxic as the correct answer.
**Option B:** This option is incorrect because it is a mercury compound that is used in some industrial applications, but it is not as toxic as the correct answer.
**Option C:** This option is incorrect because it is a mercury compound that is used in some medical applications, but it is not as toxic as the correct answer.
**Clinical Pearl / High-Yield Fact**
It's essential to note that mercury poisoning can be treated with chelating agents, such as succimer, which can help remove the mercury from the body. However, early recognition and treatment of mercury poisoning are critical to prevent long-term damage to the kidneys and nervous system.
**Correct Answer: C. Mercuric chloride.**