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

• A. Hydroiodic acid
• B. Iodic acid
• C. Hydroiodous acid
• D. Iodous acid

Answer: (A)

Verified step by step guidance

1. Identify the type of acid based on the formula HI. Since it contains hydrogen (H) and a halogen (Iodine, I), it is a binary acid (composed of hydrogen and one other element).
2. Recall the naming convention for binary acids: they start with the prefix 'hydro-', followed by the root name of the nonmetal element, and end with the suffix '-ic acid'.
3. Determine the root name of the element iodine, which is 'iod'.
4. Combine the prefix, root, and suffix to form the acid name: 'hydro' + 'iod' + 'ic acid' = 'hydroiodic acid'.
5. Verify that this name matches the standard nomenclature for binary acids and that the other options correspond to different types of acids or incorrect naming.