What is the correct name for the acid with the formula H_2S?

• A. Hydrosulfuric acid
• B. Sulfurous acid
• C. Sulfuric acid
• D. Hydrosulfic acid

Answer: (A)

Verified step by step guidance

1. Identify the chemical formula given: H_2S.
2. Recognize that H_2S is a binary acid composed of hydrogen and sulfur.
3. Recall the naming convention for binary acids: use the prefix 'hydro-', then the root of the nonmetal element, and end with the suffix '-ic acid'.
4. Apply this rule to sulfur: the root is 'sulfur', so the acid name becomes 'hydrosulfuric acid'.
5. Confirm that other options like 'sulfurous acid' and 'sulfuric acid' correspond to oxyacids of sulfur, which have oxygen atoms, unlike H_2S.