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D is hydrogen sulfide (chemical formula: H2S), commonly known as "stinky hydrogen". It smells like rotten eggs and has a formula weight of 34.08. It is an atmospheric pollutant. Density 1.539 g/L3. Melting point -85.5℃, boiling point -60.7℃. Toxic, foul-smelling, colorless gas. When the air contains 0.1H2S, it will cause headaches and dizziness in people. Inhaling large amounts of H2S can cause coma and even death. Excessive contact with H2S can cause chronic poisoning, worsening of feelings, headaches, weight loss, etc. In industrial production, it is required that the content of H2S in the air should not exceed 0.01 mg/L. H2S is slightly soluble in water, and its aqueous solution is called hydrosulfuric acid. Chemically unstable, it can burn in air when ignited and has reducing properties. Can make the surface of silver and copper products black. It reacts with many metal ions to form sulfide precipitates that are insoluble in water or acid. It reacts with many non-metals to form free sulfur.

Uses: H2S can be used to separate and identify metal ions, purify hydrochloric acid and sulfuric acid (to remove heavy metal ions), and prepare elemental sulfur, etc. It is a good reducing agent.

Preparation method: It can be directly combined with sulfur vapor and hydrogen; it can also be prepared by the interaction between metal sulfide and acid.

Hydrogen sulfide is a colorless gas that is irritating and asphyxiating. Exposure at low concentrations only causes local irritation to the respiratory tract and eyes. At high concentrations, the systemic effects are more obvious, manifesting as central nervous system symptoms and suffocation. Symptoms. Hydrogen sulfide has a "rotten egg" smell, but extremely high concentrations of hydrogen sulfide can quickly cause olfactory fatigue without being aware of the smell. Mining, smelting, sugar beet processing, carbon disulfide manufacturing, organophosphorus pesticides, and leather, sulfur dyes Hydrogen sulfide is produced in industries such as paints, pigments, and animal glues; large amounts of hydrogen sulfide can escape during operations in places where organic matter decays, such as swamps, sewers, septic tanks, sewage sedimentation tanks, etc., and it is not uncommon for workers to be poisoned. . In addition, hydrogen sulfide has a strong irritating effect on the eyes and respiratory mucosa. After hydrogen sulfide is absorbed, it mainly affects the cell oxidation process, causing tissue hypoxia.

In mild cases, the symptoms are mainly irritation, which may include tearing, stinging eyes, runny nose, burning sensation in the throat, or accompanied by symptoms such as headache, dizziness, fatigue, nausea, etc. Examination shows congestion of the conjunctiva and lung congestion. There may be dry crackles in the mouth, which can recover within a short period of time after being out of contact; moderately poisoned people have aggravated mucosal irritation symptoms, including cough, chest tightness, blurred vision, conjunctival edema and corneal ulcers; obvious headache, dizziness and other symptoms, and appear Mild disturbance of consciousness, dry or wet gong sounds can be heard in the lungs. X-ray chest X-ray shows enhanced lung markings or patchy shadows; severe poisoning causes coma, pulmonary edema, respiratory and circulatory failure, and inhalation of extremely high concentrations (1000 mg/m 'Above), "lightning death" may occur. Severe poisoning may leave neurological and psychiatric sequelae.

Note: However, hydrogen sulfide cannot be converted in the air, so there may be something wrong with your question