Question detail
Which statement would earn credit for Explain that instrumental methods are especially useful when the sample is very small.?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Identification of ions by chemical and spectroscopic means
Question
- A. They require less time to perform.
- B. They can detect very low concentrations of substances.
- C. They are less expensive than chemical tests.
- D. They provide qualitative results only.
Answer
The correct answer is They can detect very low concentrations of substances.. It matches chemical analysis because the evidence is test observation and the expected result is supported conclusion.
Explanation
The correct option is They can detect very low concentrations of substances.. The answer stays inside Identification of ions by chemical and spectroscopic means by linking the observation to the conclusion instead of naming a substance without evidence. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Misunderstanding Sample Size Importance
Students often think that instrumental methods are only useful for large samples, not realizing their advantage with small samples.
Emphasize that instrumental methods are particularly beneficial when dealing with very small samples due to their sensitivity and accuracy.
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