Which term best describes a chemical procedure that yields a positive or negative result indicating the presence of a specific ion or gas?

• A. Chromatography
• B. Quantitative analysis
• C. Qualitative test
• D. Titration

Answer: (C)

Verified step by step guidance

1. Understand the purpose of the procedure: it is designed to indicate the presence or absence of a specific ion or gas, not to measure the exact amount.
2. Recall that chromatography is a technique used to separate components in a mixture, not primarily to indicate presence or absence of a specific ion or gas.
3. Recognize that quantitative analysis involves measuring the exact amount or concentration of a substance, which is different from simply detecting presence.
4. Identify that titration is a method used to determine the concentration of a solution by reacting it with a standard solution, which is also quantitative in nature.
5. Conclude that a qualitative test is the term used for a chemical procedure that gives a positive or negative result indicating the presence of a specific ion or gas.