Which of the following steps is not involved in chemical analysis?
Correct answer: B. Separation of the sample in the mixture form
- A. Separation of sample in pure form
- B. Separation of the sample in the mixture form
- C. Preparation of sample for the analysis
- D. Validity of experimental results
Explanation
A key step in most chemical analyses is to separate the analyte of interest from interfering substances in the mixture. Analyzing the entire mixture without separation is often not possible or accurate, making it an incorrect step in a typical analytical procedure.
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Analytical chemistry identifies and measures substances using separation and instrumental methods. Chromatography is studied through stationary and mobile phases, retention and Rf values, while spectroscopy connects absorption of electromagnetic radiation with molecular structure and supports qualitative and quantitative analysis through techniques such as UV-visible and infrared spectroscopy.
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