What is the chemical name of the deadly poison 'cyanide'?
Prussic acid
Understanding Cyanide Poison: Chemical Names Explained
The question asks about the chemical name of the deadly poison commonly known as 'cyanide'. Cyanide refers to chemicals that contain a cyano group ($\text{C}\equiv\text{N}$). One of the most well-known forms of cyanide poison is hydrogen cyanide, which is a highly toxic gas or liquid.
Identifying the Correct Chemical Name for Cyanide Poison
Let's look at the options provided and determine which one corresponds to hydrogen cyanide or a related form of cyanide poison:
- Nitric acid: Nitric acid ($\text{HNO}_3$) is a strong mineral acid used in various industrial processes. It is corrosive but is not the chemical name for cyanide poison.
- Hydrochloric acid: Hydrochloric acid ($\text{HCl}$) is also a strong mineral acid, a primary component of stomach acid. It is corrosive but is not the chemical name for cyanide poison.
- Prussic acid: Prussic acid is an old common name for hydrogen cyanide ($\text{HCN}$). Hydrogen cyanide is a highly volatile, highly poisonous liquid that boils slightly above room temperature. Aqueous solutions of hydrogen cyanide are sometimes referred to as hydrocyanic acid or prussic acid. This is indeed a chemical name for a form of deadly cyanide poison.
- Sulfuric acid: Sulfuric acid ($\text{H}_2\text{SO}_4$) is a strong mineral acid, often called "oil of vitriol". It is highly corrosive and used widely in industry, but it is not the chemical name for cyanide poison.
Based on the chemical nomenclature and common names, 'Prussic acid' is the historical and chemical name specifically referring to hydrogen cyanide ($\text{HCN}$), a form of deadly cyanide poison.
Chemical Name of Cyanide Poison Summary
In summary, among the given options, Prussic acid is the correct chemical name associated with cyanide poison, specifically hydrogen cyanide ($\text{HCN}$).
Revision Table: Key Acids and Their Formulas
| Common Name | Chemical Name | Chemical Formula |
|---|---|---|
| Prussic acid | Hydrogen cyanide | $\text{HCN}$ |
| - | Nitric acid | $\text{HNO}_3$ |
| Muriatic acid | Hydrochloric acid | $\text{HCl}$ |
| Oil of vitriol | Sulfuric acid | $\text{H}_2\text{SO}_4$ |
Additional Information: Understanding Cyanide Compounds
Cyanide is a term that can refer to various chemical compounds containing the cyano group ($\text{-C}\equiv\text{N}$). These include:
- Hydrogen cyanide ($\text{HCN}$): A volatile liquid/gas, highly toxic. Also known as Prussic acid or hydrocyanic acid.
- Metal cyanides: Salts like potassium cyanide ($\text{KCN}$) and sodium cyanide ($\text{NaCN}$). These are solid salts that are also extremely toxic, especially when ingested. They can release hydrogen cyanide gas when exposed to acid or water.
The toxicity of cyanide arises from its ability to interfere with cellular respiration, specifically by binding to enzymes like cytochrome c oxidase in the mitochondria, preventing the body's cells from using oxygen.
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